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Smith AM, Grayson BE. A strike to the head: Parallels between the pediatric and adult human and the rodent in traumatic brain injury. J Neurosci Res 2024; 102:e25364. [PMID: 38953607 DOI: 10.1002/jnr.25364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Revised: 06/05/2024] [Accepted: 06/16/2024] [Indexed: 07/04/2024]
Abstract
Traumatic brain injury (TBI) is a condition that occurs commonly in children from infancy through adolescence and is a global health concern. Pediatric TBI presents with a bimodal age distribution, with very young children (0-4 years) and adolescents (15-19 years) more commonly injured. Because children's brains are still developing, there is increased vulnerability to the effects of head trauma, which results in entirely different patterns of injury than in adults. Pediatric TBI has a profound and lasting impact on a child's development and quality of life, resulting in long-lasting consequences to physical, cognitive, and emotional development. Chronic issues like learning disabilities, behavioral problems, and emotional disturbances can develop. Early intervention and ongoing support are critical for minimizing these long-term deficits. Many animal models of TBI exist, and each varies significantly, displaying different characteristics of clinical TBI. The neurodevelopment differs in the rodent from the human in timing and effect, so TBI outcomes in the juvenile rodent can thus vary from the human child. The current review compares findings from preclinical TBI work in juvenile and adult rodents to clinical TBI research in pediatric and adult humans. We focus on the four brain regions most affected by TBI: the prefrontal cortex, corpus callosum, hippocampus, and hypothalamus. Each has its unique developmental projections and thus is impacted by TBI differently. This review aims to compare the healthy neurodevelopment of these four brain regions in humans to the developmental processes in rodents.
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Affiliation(s)
- Allie M Smith
- Department of Neurology, University of Mississippi Medical Center, Jackson, Mississippi, USA
| | - Bernadette E Grayson
- Department of Neurology, University of Mississippi Medical Center, Jackson, Mississippi, USA
- Department of Population Health Science, University of Mississippi Medical Center, Jackson, Mississippi, USA
- Department of Anesthesiology, University of Mississippi Medical Center, Jackson, Mississippi, USA
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2
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Bevandić J, Chareyron LJ, Bachevalier J, Cacucci F, Genzel L, Newcombe NS, Vargha-Khadem F, Ólafsdóttir HF. Episodic memory development: Bridging animal and human research. Neuron 2024; 112:1060-1080. [PMID: 38359826 PMCID: PMC11129319 DOI: 10.1016/j.neuron.2024.01.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Revised: 12/22/2023] [Accepted: 01/19/2024] [Indexed: 02/17/2024]
Abstract
Human episodic memory is not functionally evident until about 2 years of age and continues to develop into the school years. Behavioral studies have elucidated this developmental timeline and its constituent processes. In tandem, lesion and neurophysiological studies in non-human primates and rodents have identified key neural substrates and circuit mechanisms that may underlie episodic memory development. Despite this progress, collaborative efforts between psychologists and neuroscientists remain limited, hindering progress. Here, we seek to bridge human and non-human episodic memory development research by offering a comparative review of studies using humans, non-human primates, and rodents. We highlight critical theoretical and methodological issues that limit cross-fertilization and propose a common research framework, adaptable to different species, that may facilitate cross-species research endeavors.
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Affiliation(s)
- Juraj Bevandić
- Donders Institute for Brain, Cognition and Behaviour, Radboud University, Nijmegen, the Netherlands
| | - Loïc J Chareyron
- Cognitive Neuroscience and Neuropsychiatry, Developmental Neurosciences, University College London Great Ormond Street Institute of Child Health, London, UK; Laboratory of Brain and Cognitive Development, Institute of Psychology, University of Lausanne, Lausanne, Switzerland
| | - Jocelyne Bachevalier
- Division of Developmental and Cognitive Neuroscience, Emory National Primate Research Center, Department of Psychology, Emory University, Atlanta, GA, USA.
| | - Francesca Cacucci
- Department of Neuroscience, Physiology and Pharmacology, University College London, London, UK.
| | - Lisa Genzel
- Donders Institute for Brain, Cognition and Behaviour, Radboud University, Nijmegen, the Netherlands.
| | - Nora S Newcombe
- Department of Psychology, Temple University, Philadelphia, PA, USA.
| | - Faraneh Vargha-Khadem
- Cognitive Neuroscience and Neuropsychiatry, Developmental Neurosciences, University College London Great Ormond Street Institute of Child Health, London, UK.
| | - H Freyja Ólafsdóttir
- Donders Institute for Brain, Cognition and Behaviour, Radboud University, Nijmegen, the Netherlands.
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3
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Bugaj AM, Kunath N, Saasen VL, Fernandez-Berrocal MS, Vankova A, Sætrom P, Bjørås M, Ye J. Dissecting gene expression networks in the developing hippocampus through the lens of NEIL3 depletion. Prog Neurobiol 2024; 235:102599. [PMID: 38522610 DOI: 10.1016/j.pneurobio.2024.102599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Revised: 03/09/2024] [Accepted: 03/19/2024] [Indexed: 03/26/2024]
Abstract
Gene regulation in the hippocampus is fundamental for its development, synaptic plasticity, memory formation, and adaptability. Comparisons of gene expression among different developmental stages, distinct cell types, and specific experimental conditions have identified differentially expressed genes contributing to the organization and functionality of hippocampal circuits. The NEIL3 DNA glycosylase, one of the DNA repair enzymes, plays an important role in hippocampal maturation and neuron functionality by shaping transcription. While differential gene expression (DGE) analysis has identified key genes involved, broader gene expression patterns crucial for high-order hippocampal functions remain uncharted. By utilizing the weighted gene co-expression network analysis (WGCNA), we mapped gene expression networks in immature (p8-neonatal) and mature (3 m-adult) hippocampal circuits in wild-type and NEIL3-deficient mice. Our study unveiled intricate gene network structures underlying hippocampal maturation, delineated modules of co-expressed genes, and pinpointed highly interconnected hub genes specific to the maturity of hippocampal subregions. We investigated variations within distinct gene network modules following NEIL3 depletion, uncovering NEIL3-targeted hub genes that influence module connectivity and specificity. By integrating WGCNA with DGE, we delve deeper into the NEIL3-dependent molecular intricacies of hippocampal maturation. This study provides a comprehensive systems-level analysis for assessing the potential correlation between gene connectivity and functional connectivity within the hippocampal network, thus shaping hippocampal function throughout development.
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Affiliation(s)
- Anna M Bugaj
- Department of Clinical and Molecular Medicine (IKOM), Norwegian University of Science and Technology (NTNU), Trondheim 7491, Norway
| | - Nicolas Kunath
- Department of Clinical and Molecular Medicine (IKOM), Norwegian University of Science and Technology (NTNU), Trondheim 7491, Norway; Department of Neuromedicine and Movement Science, Norwegian University of Science and Technology (NTNU), Trondheim 7491, Norway; Department of Neurology, University Hospital of Trondheim, Trondheim 7491, Norway
| | - Vidar Langseth Saasen
- Department of Clinical and Molecular Medicine (IKOM), Norwegian University of Science and Technology (NTNU), Trondheim 7491, Norway
| | - Marion S Fernandez-Berrocal
- Department of Clinical and Molecular Medicine (IKOM), Norwegian University of Science and Technology (NTNU), Trondheim 7491, Norway
| | - Ana Vankova
- Department of Clinical and Molecular Medicine (IKOM), Norwegian University of Science and Technology (NTNU), Trondheim 7491, Norway
| | - Pål Sætrom
- Department of Clinical and Molecular Medicine (IKOM), Norwegian University of Science and Technology (NTNU), Trondheim 7491, Norway
| | - Magnar Bjørås
- Department of Clinical and Molecular Medicine (IKOM), Norwegian University of Science and Technology (NTNU), Trondheim 7491, Norway; Department of Microbiology, Oslo University Hospital, University of Oslo, Oslo 0424, Norway; Centre for Embryology and Healthy Development, University of Oslo, Oslo 0373, Norway.
| | - Jing Ye
- Department of Clinical and Molecular Medicine (IKOM), Norwegian University of Science and Technology (NTNU), Trondheim 7491, Norway.
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Yarmohammadi-Samani P, Vatanparast J. Sex-specific dendritic morphology of hippocampal pyramidal neurons in the adolescent and young adult rats. Int J Dev Neurosci 2024; 84:47-63. [PMID: 37933732 DOI: 10.1002/jdn.10307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2023] [Revised: 09/02/2023] [Accepted: 10/16/2023] [Indexed: 11/08/2023] Open
Abstract
CA1 and CA3 pyramidal neurons are the major sources of hippocampal efferents. The structural features of these neurons are presumed to be involved in various normal/abnormal cognitive and emotional outcomes by influencing the pattern of synaptic inputs and neuronal signal processing. Although many studies have described hippocampal structure differences between males and females, these reports mainly focused on gross anatomical features in adult or aged models, and such distinctions on neuronal morphology and dendritic spine density during adolescence, a period of high vulnerability to neurodevelopmental disorders, have received much less attention. In this work, we analyzed dendritic architecture and density of spines in CA1 and CA3 neurons of male and female rats in early adolescence (postnatal day, PND 40) and compared them with those in late adolescence/young adulthood (PND 60). On PND 40, CA1 neurons of male rats showed more Sholl intersections and spine density in apical and basal dendrites compared to those in females. The Sholl intersections in basal dendrites of CA3 neurons were also more in males, whereas the number of apical dendrite intersections was not significantly different between sexes. In male rats, there was a notable decrease in the number of branch and terminal points in the basal dendrite of CA1 neurons of young adults when compared to their sex-matched adolescent rats. On the other hand, CA1 neurons in young adult females also showed more Sholl intersections in apical and basal dendrites compared to adolescent females. Meanwhile, the total cable length, the number of branches, and terminal points of apical dendrites in CA3 neurons also exhibited a significant reduction in young adult male rats compared to their sex-matched adolescents. In young adult rats, both apical and basal dendrites of CA3 neurons in males showed fewer intersections with Sholl circles, but there were no significant differences in dendritic spine density or count estimation between males and females. On the other hand, young adult female rats had more Sholl intersections and dendritic spine count on the basal dendrites of CA3 neurons compared to adolescent females. Although no significant sex- and age-dependent difference in neuronal density was detected in CA1 and CA3 subareas, CA3 pyramidal neurons of both male and female rats showed reduced soma area compared to adolescent rats. Our findings show that the sex differences in the dendritic structure of CA1 and CA3 neurons vary by age and also by the compartments of dendritic arbors. Such variations in the morphology of hippocampal pyramidal neurons may take part as a basis for normal cognitive and affective differences between the sexes, as well as distinct sensitivity to interfering factors and the prevalence of neuropsychological diseases.
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Affiliation(s)
| | - Jafar Vatanparast
- Department of Biology, School of Science, Shiraz University, Shiraz, Iran
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Gambi C, Lelonkiewicz JR, Crepaldi D. Do Children (and Adults) Benefit From a Prediction Error Boost in One-Shot Word Learning? J Cogn 2024; 7:13. [PMID: 38223230 PMCID: PMC10785960 DOI: 10.5334/joc.342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Accepted: 12/22/2023] [Indexed: 01/16/2024] Open
Abstract
Influential theories and computational models suggest error-based learning plays an important role in language acquisition: Children learn new words by generating predictions about upcoming utterances and revising those predictions when they are erroneous. Critically, revising stronger (rather than weaker) predictions should further enhance learning. Although previously demonstrated in adults, such prediction error boost has not been conclusively shown in children. To close this gap, we tested 107 participants between the ages of 5 and 10. We found little evidence that word learning in this age group benefits from a prediction error boost. Moreover, we also failed to replicate previous evidence for such an effect in adults. Based on a detailed task analysis, we suggest the variation in adult findings may be partly explained by differences in encoding strategies and that, relatedly, the protracted development of the episodic memory system might explain why children do not experience robust benefits from having stronger (rather than weaker) predictions disconfirmed.
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Affiliation(s)
| | | | - Davide Crepaldi
- Scuola Internazionale Superiore di Studi Avanzati (SISSA), Italy
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Sučević J, Schapiro AC. A neural network model of hippocampal contributions to category learning. eLife 2023; 12:e77185. [PMID: 38079351 PMCID: PMC10712951 DOI: 10.7554/elife.77185] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Accepted: 11/06/2023] [Indexed: 12/18/2023] Open
Abstract
In addition to its critical role in encoding individual episodes, the hippocampus is capable of extracting regularities across experiences. This ability is central to category learning, and a growing literature indicates that the hippocampus indeed makes important contributions to this form of learning. Using a neural network model that mirrors the anatomy of the hippocampus, we investigated the mechanisms by which the hippocampus may support novel category learning. We simulated three category learning paradigms and evaluated the network's ability to categorize and recognize specific exemplars in each. We found that the trisynaptic pathway within the hippocampus-connecting entorhinal cortex to dentate gyrus, CA3, and CA1-was critical for remembering exemplar-specific information, reflecting the rapid binding and pattern separation capabilities of this circuit. The monosynaptic pathway from entorhinal cortex to CA1, in contrast, specialized in detecting the regularities that define category structure across exemplars, supported by the use of distributed representations and a relatively slower learning rate. Together, the simulations provide an account of how the hippocampus and its constituent pathways support novel category learning.
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Affiliation(s)
- Jelena Sučević
- Department of Experimental Psychology, University of OxfordOxfordUnited Kingdom
| | - Anna C Schapiro
- Department of Psychology, University of PennsylvaniaPhiladelphiaUnited States
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Gliga T, Hendry A, Kong SP, Ewing B, Davies C, McGillion M, Gonzalez‐Gomez N. More frequent naps are associated with lower cognitive development in a cohort of 8-38-month-old children, during the Covid-19 pandemic. JCPP ADVANCES 2023; 3:e12190. [PMID: 38054058 PMCID: PMC10694540 DOI: 10.1002/jcv2.12190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Accepted: 06/26/2023] [Indexed: 12/07/2023] Open
Abstract
Background How often a child naps, during infancy, is believed to reflect both intrinsic factors, that is, the need of an immature brain to consolidate information soon after it is acquired, and environmental factors. Difficulty accounting for important environmental factors that interfere with a child's sleep needs (e.g., attending daycare) has clouded our ability to understand the role of intrinsic drivers of napping frequency. Methods Here we investigate sleep patterns in association with two measures of cognitive ability, vocabulary size, measured with the Oxford-Communicative Development Inventory (N = 298) and cognitive executive functions (EF), measured with the Early EF Questionnaire (N = 463), in a cohort of 8-38-month-olds. Importantly, because of the social distancing measures imposed during the Covid-19 Spring 2020 lockdown, in the UK, measures of sleep were taken when children did not access daycare settings. Results We find that children with more frequent but shorter naps than expected for their age had lower concurrent receptive vocabularies, lower cognitive EF and a slower increase in expressive vocabulary from spring to winter 2020, when age, sex, and SES were accounted for. The negative association between vocabulary and frequency of naps became stronger with age. Conclusions These findings suggest that the structure of daytime sleep is an indicator of cognitive development and highlight the importance of considering environmental perturbations and age when investigating developmental correlates of sleep.
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Affiliation(s)
- Teodora Gliga
- School of PsychologyUniversity of East AngliaNorwichUK
| | - Alexandra Hendry
- Department of Experimental PsychologyUniversity of OxfordOxfordUK
| | - Shannon P. Kong
- Centre for Psychological ResearchOxford Brookes UniversityOxfordUK
| | - Ben Ewing
- School of PsychologyUniversity of East AngliaNorwichUK
| | - Catherine Davies
- School of Languages, Cultures and SocietiesUniversity of LeedsLeedsUK
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Sweeney LM, Lara H, Gómez RL. Developmental changes in retention and generalization of nonadjacent dependencies over a period containing sleep in 18-mo-old infants. Learn Mem 2023; 30:212-220. [PMID: 37726144 PMCID: PMC10547371 DOI: 10.1101/lm.053772.123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Accepted: 07/24/2023] [Indexed: 09/21/2023]
Abstract
Sleep promotes the stabilization of memories in adulthood, with a growing literature on the benefits of sleep for memory in infants and children. In two studies, we examined the role of sleep in the retention and generalization of nonadjacent dependencies (NADs; e.g., a-X-b/c-X-d phrases) in an artificial language. Previously, a study demonstrated that over a delay of 4 h, 15 mo olds who nap after training retain a general memory of the NAD rule instead of memory for specific NADs heard during training. In experiment 1, we designed a replication of the nap condition used in the earlier study but tested 18-mo-old infants. Infants of this age retained veridical memory for specific NADs over a delay containing sleep, providing preliminary evidence of the development of memory processes (experiment 1). In experiment 2, we tested 18 mo olds' ability to generalize the NAD to new vocabulary, finding only infants who napped after training generalized their knowledge of the pattern to completely novel phrases. Overall, by 18 mo of age, children retain specific memories over a period containing sleep, and sleep promotes abstract memories to a greater extent than wakefulness.
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Affiliation(s)
- Lucia M Sweeney
- Department of Psychology, the University of Arizona, Tucson, Arizona 85721, USA
| | - Hatty Lara
- Department of Psychology, the University of Arizona, Tucson, Arizona 85721, USA
| | - Rebecca L Gómez
- Department of Psychology, the University of Arizona, Tucson, Arizona 85721, USA
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Forest TA, Abolghasem Z, Finn AS, Schlichting ML. Memories of structured input become increasingly distorted across development. Child Dev 2023; 94:e279-e295. [PMID: 37161780 DOI: 10.1111/cdev.13940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Trajectories of cognitive and neural development suggest that, despite early emergence, the ability to extract environmental patterns changes across childhood. Here, 5- to 9-year-olds and adults (N = 211, 110 females, in a large Canadian city) completed a memory test assessing what they remembered after watching a stream of shape triplets: the particular sequence in which the shapes occurred and/or their group-level structure. After accounting for developmental improvements in overall memory, all ages remembered specific transitions, while memory for group membership was only observed in older children and adults (age by test-type interaction η2 = .05). Thus, while young children form memories for specifics of structured experience, memory for derived associations is refined later-underscoring that adults and young children form different memories despite identical experience.
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Affiliation(s)
| | - Zahra Abolghasem
- Department of Psychology, University of Toronto, Toronto, Ontario, Canada
| | - Amy S Finn
- Department of Psychology, University of Toronto, Toronto, Ontario, Canada
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Nichols ES, Blumenthal A, Kuenzel E, Skinner JK, Duerden EG. Hippocampus long-axis specialization throughout development: A meta-analysis. Hum Brain Mapp 2023. [PMID: 37209288 DOI: 10.1002/hbm.26340] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 05/02/2023] [Accepted: 05/04/2023] [Indexed: 05/22/2023] Open
Abstract
The human adult hippocampus can be subdivided into the head, or anterior hippocampus and its body and tail, or posterior hippocampus, and a wealth of functional differences along the longitudinal axis have been reported. One line of literature emphasizes specialization for different aspects of cognition, whereas another emphasizes the unique role of the anterior hippocampus in emotional processing. While some research suggests that functional differences in memory between the anterior and posterior hippocampus appear early in development, it remains unclear whether this is also the case for functional differences in emotion processing. The goal of this meta-analysis was to determine whether the long-axis functional specialization observed in adults is present earlier in development. Using a quantitative meta-analysis, long-axis functional specialization was assessed using the data from 26 functional magnetic resonance imaging studies, which included 39 contrasts and 804 participants ranging in age from 4 to 21 years. Results indicated that emotion was more strongly localized to the anterior hippocampus, with memory being more strongly localized to the posterior hippocampus, demonstrating long-axis specialization with regard to memory and emotion in children similar to that seen in adults. An additional analysis of laterality indicated that while memory was left dominant, emotion was processed bilaterally.
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Affiliation(s)
- Emily S Nichols
- Faculty of Education, Western University, London, Canada
- Western Institute for Neuroscience, Western University, London, Canada
| | - Anna Blumenthal
- Cervo Brain Research Centre, Université Laval, Quebec, Canada
| | | | | | - Emma G Duerden
- Faculty of Education, Western University, London, Canada
- Western Institute for Neuroscience, Western University, London, Canada
- Pediatrics, Schulich School of Medicine & Dentistry, Western University, London, Canada
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Solis-Urra P, Esteban-Cornejo I, Mora-Gonzalez J, Stillman C, Contreras-Rodriguez O, Erickson KI, Catena A, Ortega FB. Early life factors and hippocampal functional connectivity in children with overweight/obesity. Pediatr Obes 2023; 18:e12998. [PMID: 36573637 PMCID: PMC11225616 DOI: 10.1111/ijpo.12998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/15/2022] [Accepted: 11/30/2022] [Indexed: 12/29/2022]
Abstract
OBJECTIVE We investigated the association of anthropometric neonatal data (birth length and birth weight) and breastfeeding practices (exclusive and any breastfeeding) with hippocampal functional connectivity and its academic implication in children with overweight/obesity. METHODS Ninety six children with overweight/obesity aged 8-11 years (10.01 ± 1.14), from the ActiveBrains project were included in this cross-sectional study. Anthropometric neonatal data were collected from birth records, whereas breastfeeding practices were reported by parents. A 3.0 Tesla Siemens Magnetom Tim Trio system was used to acquire T1-weighted and resting-state functional magnetic resonance images. Academic performance was assessed by the Woodcock-Muñoz standardized test. Hippocampal seed-based methods with post-hoc regression analyses were performed. Analyses were considered significant when surpassing Family-Wise Error corrections. RESULTS Birth weight showed a positive association with the connectivity between the hippocampus and the pre- and postcentral gyri, and the cerebellum. In addition, breastfeeding was negatively associated with the connectivity between the hippocampus and the primary motor cortex and the angular gyrus. Any breastfeeding, in turn, showed a positive association with the connectivity between the hippocampus and the middle temporal gyrus. None of the connectivity outcomes related to early life factors was coupled with better academic abilities (all p > 0.05). CONCLUSIONS Our findings suggest that birth weight at birth and breastfeeding are associated with hippocampal connectivity in children with overweight/obesity. Despite this, how the results relate to academic performance remains a matter of speculation. Our findings suggest that clinicians should recognize the importance early life factors for potentially avoiding consequences on offspring's brain development.
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Affiliation(s)
- Patricio Solis-Urra
- PROFITH “PROmoting FITness and Health Through Physical Activity” Research Group, Sport and Health University Research Institute (iMUDS), Department of Physical and Sports Education, Faculty of Sport Sciences, University of Granada, Granada, Spain
- Nuclear Medicine Services, “Virgen de Las Nieves”, University Hospital, Granada, Spain
- Faculty of Education and Social Sciences, Universidad Andres Bello, Viña del Mar, Chile
| | - Irene Esteban-Cornejo
- PROFITH “PROmoting FITness and Health Through Physical Activity” Research Group, Sport and Health University Research Institute (iMUDS), Department of Physical and Sports Education, Faculty of Sport Sciences, University of Granada, Granada, Spain
- Centro de Investigación Biomédica en Red Fisiopatología de la Obesidad y Nutrición (CIBERobn), Instituto de Salud Carlos III, Madrid, Spain
| | - Jose Mora-Gonzalez
- PROFITH “PROmoting FITness and Health Through Physical Activity” Research Group, Sport and Health University Research Institute (iMUDS), Department of Physical and Sports Education, Faculty of Sport Sciences, University of Granada, Granada, Spain
| | - Chelsea Stillman
- Department of Psychology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Oren Contreras-Rodriguez
- Medical Imaging, Girona Biomedical Research Institute (IdibGi), and CIBERSAM, Girona, Spain
- Department of Psychiatry and Legal Medicine, Faculty of Medicine, Autonomous University of Barcelona, Barcelona, Spain
| | - Kirk I. Erickson
- PROFITH “PROmoting FITness and Health Through Physical Activity” Research Group, Sport and Health University Research Institute (iMUDS), Department of Physical and Sports Education, Faculty of Sport Sciences, University of Granada, Granada, Spain
- Department of Psychology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
- AdventHealth Research Institute, Orlando, Florida, USA
| | - Andrés Catena
- School of Psychology, University of Granada, Granada, Spain
| | - Francisco B. Ortega
- PROFITH “PROmoting FITness and Health Through Physical Activity” Research Group, Sport and Health University Research Institute (iMUDS), Department of Physical and Sports Education, Faculty of Sport Sciences, University of Granada, Granada, Spain
- Centro de Investigación Biomédica en Red Fisiopatología de la Obesidad y Nutrición (CIBERobn), Instituto de Salud Carlos III, Madrid, Spain
- Faculty of Sport and Health Sciences, University of Jyväskylä, Jyväskylä, Finland
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Ristanovic I, Vargas TG, Damme KSF, Mittal VA. Hippocampal subfields, daily stressors, and resting cortisol in individuals at clinical high-risk for psychosis. Psychoneuroendocrinology 2023; 148:105996. [PMID: 36495626 PMCID: PMC9898196 DOI: 10.1016/j.psyneuen.2022.105996] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Revised: 10/17/2022] [Accepted: 11/28/2022] [Indexed: 12/03/2022]
Abstract
INTRODUCTION The hippocampus, comprised of functionally distinct subfields, both regulates stress and is affected by it during psychosis pathogenesis. Hippocampal abnormalities are evident across psychosis spectrum and are associated with aberrant cortisol levels and greater environmental stressors exposure. These associations, particularly at the subfield-level, are poorly understood in individuals at clinical high-risk (CHR) for psychosis. This represents a significant literature gap given this critical pathogenetic period is characterized by an interplay between environmental stressors and biological susceptibility. METHODS A total of 121 participants including 51 CHR (mean age=18.61) and 70 healthy controls (HC; mean age=18.3) were enrolled in the study. Participants completed a structural scan, salivary cortisol assays, and a self-report measure assessing distress from daily stressors exposure (DSI). Hippocampal subfield segmentation was conducted using Freesurfer. RESULTS Smaller hippocampal subfields were associated with greater stress levels. Greater DSI was associated with lower volumes in CA1 (r = -0.38) and CA2/3 (r = -0.29), but not in CA4/DG (r = -0.28), presubiculum (r = -0.09), or subiculum (r = -0.17). Higher resting cortisol was associated with lower volumes in presubiculum (r = -0.4) but not subiculum (r = -0.22), CA1 (r = 0.08), CA2/3 (r = 0.1), or CA4/DG (r = -0.005). Regressions indicated effects for CA1 and DSI (β = 0.57, p = .03) and presubiculum and cortisol (β = 0.61, p = .02) are specific to CHR participants relative to HCs. CONCLUSIONS The findings provided insights into links between stress and brain vulnerability during psychosis-risk period. Regional differences highlighted potentially different mechanisms by which stress impacts specific subfields. Presubiculum may be more susceptible to the impact of early stress on HPA-axis and cornu amonis to acute stressors.
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Affiliation(s)
- Ivanka Ristanovic
- Northwestern University, Department of Psychology, Evanston, IL 60208, USA; Institute for Innovations in Developmental Sciences (DevSci), Northwestern University, Evanston, Chicago, IL, USA.
| | - Teresa G Vargas
- Northwestern University, Department of Psychology, Evanston, IL 60208, USA; Institute for Innovations in Developmental Sciences (DevSci), Northwestern University, Evanston, Chicago, IL, USA
| | - Katherine S F Damme
- Northwestern University, Department of Psychology, Evanston, IL 60208, USA; Institute for Innovations in Developmental Sciences (DevSci), Northwestern University, Evanston, Chicago, IL, USA
| | - Vijay Anand Mittal
- Northwestern University, Department of Psychology, Evanston, IL 60208, USA; Institute for Innovations in Developmental Sciences (DevSci), Northwestern University, Evanston, Chicago, IL, USA; Northwestern University, Department of Psychiatry, Chicago, IL 60611, USA; Northwestern University, Medical Social Sciences, Chicago IL 60611, USA; Norhtwestern University, Institute for Policy Research, Evanston, IL 60208, USA
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13
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Fel JT, Ellis CT, Turk-Browne NB. Automated and manual segmentation of the hippocampus in human infants. Dev Cogn Neurosci 2023; 60:101203. [PMID: 36791555 PMCID: PMC9957787 DOI: 10.1016/j.dcn.2023.101203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 01/25/2023] [Accepted: 01/25/2023] [Indexed: 01/30/2023] Open
Abstract
The hippocampus, critical for learning and memory, undergoes substantial changes early in life. Investigating the developmental trajectory of hippocampal structure and function requires an accurate method for segmenting this region from anatomical MRI scans. Although manual segmentation is regarded as the "gold standard" approach, it is laborious and subjective. This has fueled the pursuit of automated segmentation methods in adults. However, little is known about the reliability of these automated protocols in infants, particularly when anatomical scan quality is degraded by head motion or the use of shorter and quieter infant-friendly sequences. During a task-based fMRI protocol, we collected quiet T1-weighted anatomical scans from 42 sessions with awake infants aged 4-23 months. Two expert tracers first segmented the hippocampus in both hemispheres manually. The resulting inter-rater reliability (IRR) was only moderate, reflecting the difficulty of infant segmentation. We then used four protocols to predict these manual segmentations: average adult template, average infant template, FreeSurfer software, and Automated Segmentation of Hippocampal Subfields (ASHS) software. ASHS generated the most reliable hippocampal segmentations in infants, exceeding the manual IRR of experts. Automated methods thus provide robust hippocampal segmentations of noisy T1-weighted infant scans, opening new possibilities for interrogating early hippocampal development.
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Affiliation(s)
- J T Fel
- Department of Psychology, Yale University, New Haven, CT 06511, USA
| | - C T Ellis
- Department of Psychology, Stanford University, Stanford, CA 94305, USA
| | - N B Turk-Browne
- Department of Psychology, Yale University, New Haven, CT 06511, USA; Wu Tsai Institute, Yale University, New Haven, CT 06511, USA.
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14
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Liu C, Liu J, Gong H, Liu T, Li X, Fan X. Implication of Hippocampal Neurogenesis in Autism Spectrum Disorder: Pathogenesis and Therapeutic Implications. Curr Neuropharmacol 2023; 21:2266-2282. [PMID: 36545727 PMCID: PMC10556385 DOI: 10.2174/1570159x21666221220155455] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Revised: 11/12/2022] [Accepted: 11/14/2022] [Indexed: 12/24/2022] Open
Abstract
Autism spectrum disorder (ASD) is a cluster of heterogeneous neurodevelopmental conditions with atypical social communication and repetitive sensory-motor behaviors. The formation of new neurons from neural precursors in the hippocampus has been unequivocally demonstrated in the dentate gyrus of rodents and non-human primates. Accumulating evidence sheds light on how the deficits in the hippocampal neurogenesis may underlie some of the abnormal behavioral phenotypes in ASD. In this review, we describe the current evidence concerning pre-clinical and clinical studies supporting the significant role of hippocampal neurogenesis in ASD pathogenesis, discuss the possibility of improving hippocampal neurogenesis as a new strategy for treating ASD, and highlight the prospect of emerging pro-neurogenic therapies for ASD.
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Affiliation(s)
- Chuanqi Liu
- Department of Military Cognitive Psychology, School of Psychology, Third Military Medical University (Army Medical University), Chongqing, China
- Battalion 5 of Cadet Brigade, Third Military Medical University (Army Medical University), Chongqing, China
| | - Jiayin Liu
- Department of Military Cognitive Psychology, School of Psychology, Third Military Medical University (Army Medical University), Chongqing, China
- Battalion 5 of Cadet Brigade, Third Military Medical University (Army Medical University), Chongqing, China
| | - Hong Gong
- Department of Military Cognitive Psychology, School of Psychology, Third Military Medical University (Army Medical University), Chongqing, China
| | - Tianyao Liu
- Department of Military Cognitive Psychology, School of Psychology, Third Military Medical University (Army Medical University), Chongqing, China
| | - Xin Li
- Department of Military Cognitive Psychology, School of Psychology, Third Military Medical University (Army Medical University), Chongqing, China
- Army 953 Hospital, Shigatse Branch of Xinqiao Hospital, Third Military Medical University (Army Medical University), Shigatse, China
| | - Xiaotang Fan
- Department of Military Cognitive Psychology, School of Psychology, Third Military Medical University (Army Medical University), Chongqing, China
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15
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Memory for nonadjacent dependencies in the first year of life and its relation to sleep. Nat Commun 2022; 13:7896. [PMID: 36550131 PMCID: PMC9780241 DOI: 10.1038/s41467-022-35558-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Accepted: 12/10/2022] [Indexed: 12/24/2022] Open
Abstract
Grammar learning requires memory for dependencies between nonadjacent elements in speech. Immediate learning of nonadjacent dependencies has been observed in very young infants, but their memory of such dependencies has remained unexplored. Here we used event-related potentials to investigate whether 6- to 8-month-olds retain nonadjacent dependencies and if sleep after learning affects this memory. Infants were familiarised with two rule-based morphosyntactic dependencies, presented in sentences of an unknown language. Brain responses after a retention period reveal memory of the nonadjacent dependencies, independent of whether infants napped or stayed awake. Napping, however, altered a specific processing stage, suggesting that memory evolves during sleep. Infants with high left frontal spindle activity show an additional brain response indicating memory of individual speech phrases. Results imply that infants as young as 6 months are equipped with memory mechanisms relevant to grammar learning. They also suggest that during sleep, consolidation of highly specific information can co-occur with changes in the nature of generalised memory.
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16
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Contributions of memory and brain development to the bioregulation of naps and nap transitions in early childhood. Proc Natl Acad Sci U S A 2022; 119:e2123415119. [PMID: 36279436 PMCID: PMC9636905 DOI: 10.1073/pnas.2123415119] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The transition from multiple sleep bouts each day to a single overnight sleep bout (i.e., nap transition) is a universal process in human development. Naps are important during infancy and early childhood as they enhance learning through memory consolidation. However, a normal part of development is the transition out of naps. Understanding nap transitions is essential in order to maximize early learning and promote positive long-term cognitive outcomes. Here, we propose a novel hypothesis regarding the cognitive, physiological, and neural changes that accompany nap transitions. Specifically, we posit that maturation of the hippocampal-dependent memory network results in more efficient memory storage, which reduces the buildup of homeostatic sleep pressure across the cortex (as reflected by slow-wave activity), and eventually, contributes to nap transitions. This hypothesis synthesizes evidence of bioregulatory mechanisms underlying nap transitions and sheds new light on an important window of change in development. This framework can be used to evaluate multiple untested predictions from the field of sleep science and ultimately, yield science-based guidelines and policies regarding napping in childcare and early education settings.
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17
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Di Benedetto MG, Scassellati C, Cattane N, Riva MA, Cattaneo A. Neurotrophic factors, childhood trauma and psychiatric disorders: A systematic review of genetic, biochemical, cognitive and imaging studies to identify potential biomarkers. J Affect Disord 2022; 308:76-88. [PMID: 35378148 DOI: 10.1016/j.jad.2022.03.071] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 03/01/2022] [Accepted: 03/29/2022] [Indexed: 11/28/2022]
Abstract
BACKGROUND Exposure to traumatic experience represents one of the key environmental factors influencing the risk for several psychiatric disorders, in particular when suffered during childhood, a critical period for brain development, characterized by a high level of neuroplasticity. Abnormalities affecting neurotrophic factors might play a fundamental role in the link between childhood trauma (CT) and early life stress (ELS) and psychiatric disorders. METHODS A systematic review was conducted, considering genetic, biochemical and expression studies along with cognitive and brain structure imaging investigations, based on PubMed and Web of Science databases (available up until November 2021), to identify potential neuroplasticity related biomarkers associated both with CT/ELS and psychiatric disorders. The search was followed by data abstraction and study quality assessment (Newcastle-Ottawa Scale). RESULTS 103 studies met our eligibility criteria. Among them, 65 were available for genetic, 30 for biochemical and 3 for mRNA data; 45 findings were linked to specific symptomatology/pathologies, 16 with various cognitive functions, 19 with different brain areas, 6 on methylation and 36 performed on control subjects for the Brain Derived Neurotrophic Factor (BDNF); whereas 4 expression/biochemical studies covered Neurotrophin 4 (NT-4), Vascular Endothelium Growth Factor (VEGF), Epidermal Growth Factor (EGF), Fibroblast Growth Factor (FGF), and Transforming Growth Factor β1 (TGF-β1). LIMITATIONS Heterogeneity of assessments (biological, psychological, of symptomatology, and CT/ELS), age range and ethnicity of samples for BDNF studies; limited studies for other neurotrophins. CONCLUSIONS Results support the key role of BDNF (in form of Met allele) as biomarker, both at genetic and biochemical level, in mediating the effect of CT/ELS in psychiatric disorders, passing through specific cognitive functions and specific brain region architecture.
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Affiliation(s)
- Maria Grazia Di Benedetto
- Biological Psychiatry Unit, IRCCS Istituto Centro S. Giovanni di Dio Fatebenefratelli, Brescia, Italy; Department of Pharmacological and Biomolecular Sciences, University of Milan, Italy
| | - Catia Scassellati
- Biological Psychiatry Unit, IRCCS Istituto Centro S. Giovanni di Dio Fatebenefratelli, Brescia, Italy
| | - Nadia Cattane
- Biological Psychiatry Unit, IRCCS Istituto Centro S. Giovanni di Dio Fatebenefratelli, Brescia, Italy
| | - Marco Andrea Riva
- Biological Psychiatry Unit, IRCCS Istituto Centro S. Giovanni di Dio Fatebenefratelli, Brescia, Italy; Department of Pharmacological and Biomolecular Sciences, University of Milan, Italy
| | - Annamaria Cattaneo
- Biological Psychiatry Unit, IRCCS Istituto Centro S. Giovanni di Dio Fatebenefratelli, Brescia, Italy; Department of Pharmacological and Biomolecular Sciences, University of Milan, Italy.
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18
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Real-world statistics at two timescales and a mechanism for infant learning of object names. Proc Natl Acad Sci U S A 2022; 119:e2123239119. [PMID: 35482916 PMCID: PMC9170168 DOI: 10.1073/pnas.2123239119] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Infants learn mappings between heard names and seen things before their first birthday and before they produce spoken language. Two challenges to explaining this early learning are the immaturity of infant memory systems and the infrequency of any individual object name in the heard language input. We quantified the frequency of visual referents, heard names, and the cooccurrences of referents and names in infant everyday experiences. We discovered statistical patterns at two timescales that align with a cortical mechanism of associative memory formation that supports the rapid formation of durable associative memories from very few experienced cooccurrences. Infants begin learning the visual referents of nouns before their first birthday. Despite considerable empirical and theoretical effort, little is known about the statistics of the experiences that enable infants to break into object–name learning. We used wearable sensors to collect infant experiences of visual objects and their heard names for 40 early-learned categories. The analyzed data were from one context that occurs multiple times a day and includes objects with early-learned names: mealtime. The statistics reveal two distinct timescales of experience. At the timescale of many mealtime episodes (n = 87), the visual categories were pervasively present, but naming of the objects in each of those categories was very rare. At the timescale of single mealtime episodes, names and referents did cooccur, but each name–referent pair appeared in very few of the mealtime episodes. The statistics are consistent with incremental learning of visual categories across many episodes and the rapid learning of name–object mappings within individual episodes. The two timescales are also consistent with a known cortical learning mechanism for one-episode learning of associations: new information, the heard name, is incorporated into well-established memories, the seen object category, when the new information cooccurs with the reactivation of that slowly established memory.
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19
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Clark TD, Reichelt AC, Ghosh-Swaby O, Simpson SJ, Crean AJ. Nutrition, anxiety and hormones. Why sex differences matter in the link between obesity and behavior. Physiol Behav 2022; 247:113713. [DOI: 10.1016/j.physbeh.2022.113713] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 01/12/2022] [Accepted: 01/19/2022] [Indexed: 12/12/2022]
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20
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Bouyeure A, Bekha D, Patil S, Hertz-Pannier L, Noulhiane M. OUP accepted manuscript. Cereb Cortex Commun 2022; 3:tgac004. [PMID: 35261977 PMCID: PMC8895309 DOI: 10.1093/texcom/tgac004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 01/06/2022] [Accepted: 01/08/2022] [Indexed: 11/13/2022] Open
Abstract
The structure-function relationship between white matter microstructure and episodic memory (EM) has been poorly studied in the developing brain, particularly in early childhood. Previous studies in adolescents and adults have shown that episodic memory recall is associated with prefrontal-limbic white matter microstructure. It is unknown whether this association is also observed during early ontogeny. Here, we investigated the association between prefrontal-limbic tract microstructure and EM performance in a cross-sectional sample of children aged 4 to 12 years. We used a multivariate partial least squares correlation approach to extract tract-specific latent variables representing shared information between age and diffusion parameters describing tract microstructure. Individual projections onto these latent variables describe patterns of interindividual differences in tract maturation that can be interpreted as scores of white matter tract microstructural maturity. Using these estimates of microstructural maturity, we showed that maturity scores of the uncinate fasciculus and dorsal cingulum bundle correlated with distinct measures of EM recall. Furthermore, the association between tract maturity scores and EM recall was comparable between younger and older children. Our results provide new evidence on the relation between white matter maturity and EM performance during development.
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Affiliation(s)
- Antoine Bouyeure
- UNIACT, NeuroSpin, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
- UMR1141, Inserm, Université de Paris, 75019 Paris, France
| | - Dhaif Bekha
- UNIACT, NeuroSpin, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
- UMR1141, Inserm, Université de Paris, 75019 Paris, France
| | - Sandesh Patil
- UNIACT, NeuroSpin, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
- UMR1141, Inserm, Université de Paris, 75019 Paris, France
| | - Lucie Hertz-Pannier
- UNIACT, NeuroSpin, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
- UMR1141, Inserm, Université de Paris, 75019 Paris, France
| | - Marion Noulhiane
- UNIACT, NeuroSpin, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
- UMR1141, Inserm, Université de Paris, 75019 Paris, France
- Corresponding author: UNIACT, NeuroSpin, CEA, 91191 Gif-sur-Yvette, France.
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21
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Johnson EG, Mooney L, Graf Estes K, Nordahl CW, Ghetti S. Activation for newly learned words in left medial-temporal lobe during toddlers' sleep is associated with memory for words. Curr Biol 2021; 31:5429-5438.e5. [PMID: 34670113 DOI: 10.1016/j.cub.2021.09.058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 05/26/2021] [Accepted: 09/22/2021] [Indexed: 10/20/2022]
Abstract
Little is known about the neural substrates underlying early memory functioning. To gain more insight, we examined how toddlers remember newly learned words. Hippocampal and anterior medial-temporal lobe (MTL) processes have been hypothesized to support forming and retaining the association between novel words and their referents, but direct evidence of this connection in early childhood is lacking. We assessed 2-year-olds (n = 38) for their memory of newly learned pseudowords associated with novel objects and puppets. We tested memory for these associations during the same session as learning and after a 1-week delay. We then played these pseudowords, previously known words, and completely novel pseudowords during natural nocturnal sleep, while collecting functional magnetic resonance imaging data. Activation in the left hippocampus and the left anterior MTL for newly learned compared to novel words was associated with same-session memory for these newly learned words only when they were learned as puppet names. Activation for known words was associated with memory for puppet names at the 1-week delay. Activation for newly learned words was also associated with overall productive vocabulary. These results underscore an early developing link between memory mechanisms and word learning in the medial temporal lobe.
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Affiliation(s)
- Elliott Gray Johnson
- Human Development Graduate Group, University of California, Davis, Davis, CA 95616, USA; Center for Mind and Brain, University of California, Davis, Davis, CA 95618, USA.
| | - Lindsey Mooney
- Center for Mind and Brain, University of California, Davis, Davis, CA 95618, USA; Department of Psychology, University of California, Davis, Davis, CA 95616, USA
| | - Katharine Graf Estes
- Human Development Graduate Group, University of California, Davis, Davis, CA 95616, USA; Center for Mind and Brain, University of California, Davis, Davis, CA 95618, USA; Department of Psychology, University of California, Davis, Davis, CA 95616, USA
| | - Christine Wu Nordahl
- Department of Psychiatry and Behavioral Sciences, University of California, Davis, Sacramento, CA 95817, USA; MIND Institute, University of California, Davis, Sacramento, CA 95817, USA
| | - Simona Ghetti
- Human Development Graduate Group, University of California, Davis, Davis, CA 95616, USA; Center for Mind and Brain, University of California, Davis, Davis, CA 95618, USA; Department of Psychology, University of California, Davis, Davis, CA 95616, USA.
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22
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Mason GM, Kurdziel LBF, Spencer RMC. The memory benefits of two naps per day during infancy: A pilot investigation. Infant Behav Dev 2021; 65:101647. [PMID: 34530287 PMCID: PMC8627454 DOI: 10.1016/j.infbeh.2021.101647] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Revised: 09/01/2021] [Accepted: 09/07/2021] [Indexed: 11/18/2022]
Abstract
In infancy, sleep occurs in multiple nap and overnight bouts that change developmentally in quantity and distribution. Though studies suggest that infant memory benefits from a single nap, no work has assessed the relative benefits of different naps (morning vs. afternoon), nor how multiple naps support memory across the day. We investigated the memory benefit of a morning nap, relative to morning wake, and the effect of these intervals on afternoon nap function in 9-month-olds (n = 15). Infants participated in two within-subjects conditions (separated by 1-2 weeks). In the Nap-Nap condition, infants took their morning and afternoon naps; in the Wake-Nap condition, infants were kept awake during morning naptime, but napped unrestricted in the afternoon. Before each nap/wake interval, infants completed an imitation memory task, with memory assessed again shortly after the nap/wake interval. In the Nap-Nap condition, infants showed memory retention across morning and afternoon naps. In contrast, infants tended to forget items learned across morning wake in the Wake-Nap condition. Moreover, morning wake was associated with a significant decline in post-nap retention of items learned in the afternoon. Furthermore, relations between nap slow-wave activity (SWA) and memory varied across naps, with SWA either not predicting (morning naps) or positively predicting (afternoon naps) memory change in the Nap-Nap condition, but negatively predicting afternoon memory change in the Wake-Nap condition. We conclude that two naps per day (rather than one) aids memory at 9 months, and that skipping the morning nap may moderate relations between afternoon nap physiology and memory.
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Affiliation(s)
- Gina M Mason
- Department of Psychological & Brain Sciences, United States; Neuroscience & Behavior Program, University of Massachusetts, Amherst, United States
| | | | - Rebecca M C Spencer
- Department of Psychological & Brain Sciences, United States; Neuroscience & Behavior Program, University of Massachusetts, Amherst, United States; Institute for Applied Life Sciences, University of Massachusetts, Amherst, United States.
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23
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Esterline K, Gómez RL. The Role of Sleep in Retention of New Words in Habitually and Non-Habitually Napping Children. Brain Sci 2021; 11:brainsci11101320. [PMID: 34679385 PMCID: PMC8533952 DOI: 10.3390/brainsci11101320] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 09/28/2021] [Accepted: 09/30/2021] [Indexed: 11/19/2022] Open
Abstract
Daytime napping contributes to retention of new word learning in children. Importantly, children transition out of regular napping between ages 3–5 years, and the impact of this transition on memory is unclear. Here, we examined the performance of both non-habitually napping children (nap 0–3 days per week, n = 28) and habitually napping children (nap 4–7 days per week, n = 30) on a word learning task after a delay including either sleep or wakefulness. Children ages 3.5–4.5 years old experienced a brief exposure to two novel labels and their referents during training, a scenario that replicates learning experiences children encounter every day. After a 4-h delay, children were tested on the object-label associations. Using mixed effects logistic regression, we compared retention performance. Non-habitual nappers and habitual nappers displayed a different pattern of retention such that non-habitually napping children did equally well on a test of retention regardless of whether they napped or stayed awake during the delay. In contrast, habitually napping children needed a nap after learning to retain the novel object-label associations 4 h later. As a group, habitual nappers who remained awake after learning performed no better than chance on the retention test. As children transition out of naps, they may be less susceptible to interference and are better able to retain newly learned words across a delay including wakefulness.
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24
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Banker SM, Gu X, Schiller D, Foss-Feig JH. Hippocampal contributions to social and cognitive deficits in autism spectrum disorder. Trends Neurosci 2021; 44:793-807. [PMID: 34521563 DOI: 10.1016/j.tins.2021.08.005] [Citation(s) in RCA: 95] [Impact Index Per Article: 31.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Revised: 07/07/2021] [Accepted: 08/10/2021] [Indexed: 10/20/2022]
Abstract
Autism spectrum disorder (ASD) is characterized by hallmark impairments in social functioning. Nevertheless, nonsocial cognition, including hippocampus-dependent spatial reasoning and episodic memory, is also commonly impaired in ASD. ASD symptoms typically emerge between 12 and 24 months of age, a time window associated with critical developmental events in the hippocampus. Despite this temporal overlap and evidence of hippocampal structural abnormalities in ASD individuals, relatively few human studies have focused on hippocampal function in ASD. Herein, we review the existing evidence for the involvement of the hippocampus in ASD and highlight the hippocampus as a promising area of interest for future research in ASD.
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Affiliation(s)
- Sarah M Banker
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Seaver Autism Center for Research and Treatment, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Center for Computational Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; The Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.
| | - Xiaosi Gu
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Center for Computational Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; The Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Daniela Schiller
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Center for Computational Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; The Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Jennifer H Foss-Feig
- Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Seaver Autism Center for Research and Treatment, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; The Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; The Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
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25
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Walker CD, Kuhn CM, Risher ML. The effects of peri-adolescent alcohol use on the developing hippocampus. INTERNATIONAL REVIEW OF NEUROBIOLOGY 2021; 160:251-280. [PMID: 34696875 DOI: 10.1016/bs.irn.2021.08.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Adolescence is a period of continued brain development. Regions of the brain, such as the hippocampus, continue to undergo refinement and maturation throughout adolescence and into early adulthood. Adolescence is also a time of heightened sensitivity to novelty and reward, which contribute to an increase in risk-taking behaviors including the use of drugs and alcohol. Importantly, binge drinking is highly prevalent among adolescents and emerging adults. The hippocampus which is important for the integration of emotion, reward, homeostasis, and memory is particularly vulnerable to the neurotoxic effects of alcohol. In this chapter, we cover the fundamentals of hippocampal neuroanatomy and the current state of knowledge of the acute and chronic effects of ethanol in adolescent humans and adolescent rodent models. We focus on the hippocampal-dependent behavioral, structural, and neurochemical changes and identify knowledge gaps in our understanding of age-dependent neurobiological effects of alcohol use.
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Affiliation(s)
- C D Walker
- Department of Biomedical Research, Joan C Edwards School of Medicine Marshall University, Huntington, WV, United States
| | - Cynthia M Kuhn
- Department of Pharmacology and Cancer Biology, School of Medicine, Duke University, Durham, NC, United States
| | - M-L Risher
- Department of Biomedical Research, Joan C Edwards School of Medicine Marshall University, Huntington, WV, United States; Neurobiology Research Laboratory, Hershel Woody Williams Veteran Affairs Medical Center, Huntington, WV, United States.
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26
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Ellis CT, Skalaban LJ, Yates TS, Bejjanki VR, Córdova NI, Turk-Browne NB. Evidence of hippocampal learning in human infants. Curr Biol 2021; 31:3358-3364.e4. [PMID: 34022155 DOI: 10.1016/j.cub.2021.04.072] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 03/19/2021] [Accepted: 04/28/2021] [Indexed: 01/26/2023]
Abstract
The hippocampus is essential for human memory.1 The protracted maturation of memory capacities from infancy through early childhood2-4 is thus often attributed to hippocampal immaturity.5-7 The hippocampus of human infants has been characterized in terms of anatomy,8,9 but its function has never been tested directly because of technical challenges.10,11 Here, we use recently developed methods for task-based fMRI in awake human infants12 to test the hypothesis that the infant hippocampus supports statistical learning.13-15 Hippocampal activity increased with exposure to visual sequences of objects when the temporal order contained regularities to be learned, compared to when the order was random. Despite the hippocampus doubling in anatomical volume across infancy, learning-related functional activity bore no relationship to age. This suggests that the hippocampus is recruited for statistical learning at the youngest ages in our sample, around 3 months. Within the hippocampus, statistical learning was clearer in anterior than posterior divisions. This is consistent with the theory that statistical learning occurs in the monosynaptic pathway,16 which is more strongly represented in the anterior hippocampus.17,18 The monosynaptic pathway develops earlier than the trisynaptic pathway, which is linked to episodic memory,19,20 raising the possibility that the infant hippocampus participates in statistical learning before it forms durable memories. Beyond the hippocampus, the medial prefrontal cortex showed statistical learning, consistent with its role in adult memory integration21 and generalization.22 These results suggest that the hippocampus supports the vital ability of infants to extract the structure of their environment through experience.
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Affiliation(s)
- Cameron T Ellis
- Department of Psychology, Yale University, 2 Hillhouse Avenue, New Haven, CT 06511, USA
| | - Lena J Skalaban
- Department of Psychology, Yale University, 2 Hillhouse Avenue, New Haven, CT 06511, USA
| | - Tristan S Yates
- Department of Psychology, Yale University, 2 Hillhouse Avenue, New Haven, CT 06511, USA
| | - Vikranth R Bejjanki
- Department of Psychology, Hamilton College, 198 College Hill Road, Clinton, NY 13323, USA
| | - Natalia I Córdova
- Department of Psychology, Yale University, 2 Hillhouse Avenue, New Haven, CT 06511, USA
| | - Nicholas B Turk-Browne
- Department of Psychology, Yale University, 2 Hillhouse Avenue, New Haven, CT 06511, USA.
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Ngo CT, Benear SL, Popal H, Olson IR, Newcombe NS. Contingency of semantic generalization on episodic specificity varies across development. Curr Biol 2021; 31:2690-2697.e5. [PMID: 33887184 PMCID: PMC8222141 DOI: 10.1016/j.cub.2021.03.088] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 02/10/2021] [Accepted: 03/26/2021] [Indexed: 11/28/2022]
Abstract
Semantic memory-general knowledge of ideas and concepts-includes generalization processes that support inference. Episodic memory, on the other hand, preserves the specificity of individual events by binding together unique combinations of elements from an episode and relies on pattern separation to distinguish similar experiences. These two memory systems play complementary roles, supporting different mnemonic goals, but the nature and extent of their interdependence is unclear.1,2 Some models suggest that new information is encoded initially as hippocampus-dependent episodic memory and then, either through repetition or gist extraction, becomes semantic over time.3,4 These models also posit a neocortical route to semantic memory acquisition exists that can bypass the hippocampus.3 Both proposed routes are slow learning mechanisms, yet generalization can occur rapidly. Recent models suggest that fast generalization relies, in part, on the retrieval of individual but related episodes.5,6 Such episodic memory gating mechanisms render fast generalization contingent on the memory specificity of instances, a pattern that has been observed in adults.7,8 None of these models take into account the observation that generalization and episodic specificity have asynchronous developmental profiles, with generalization emerging years before episodic memory.9,10 We ask two questions about generalized and specific memory during early childhood: first, is rapid generalization contingent on remembering specific past memories? And second, does the strength or nature of this contingency differ across development? We found that the interdependence of generalization and episodic memory varies across development: generalization success in adults, but not in children, was contingent on context binding.
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Affiliation(s)
- Chi T Ngo
- Center for Lifespan Psychology, Max Planck Institute for Human Development, Berlin, Germany.
| | - Susan L Benear
- Department of Psychology, Temple University, Philadelphia, PA, USA
| | - Haroon Popal
- Department of Psychology, Temple University, Philadelphia, PA, USA
| | - Ingrid R Olson
- Department of Psychology, Temple University, Philadelphia, PA, USA
| | - Nora S Newcombe
- Department of Psychology, Temple University, Philadelphia, PA, USA
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Timing storytime to maximize children's ability to retain new vocabulary. J Exp Child Psychol 2021; 210:105207. [PMID: 34157497 DOI: 10.1016/j.jecp.2021.105207] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 04/22/2021] [Accepted: 05/19/2021] [Indexed: 11/22/2022]
Abstract
Shared storybook reading is a key aid to vocabulary acquisition during childhood. However, word learning research has tended to use unnaturalistic (explicit) training regimes. Using a storybook paradigm, we examined whether children (particularly those with weaker vocabularies) are more likely to retain new words if they learn them closer to sleep. Parents read their children (5- to 7-year-olds; N = 237) an alien adventure story that contained 12 novel words with illustrations at one of two training times: at bedtime or 3-5 h before bedtime. Using online tasks, parents tested their children's ability to recall the new words (production) and associate them with pictures (comprehension) immediately after hearing the story and again the following morning. As hypothesized, we replicated two findings. First, children showed overnight improvements in their ability to produce and comprehend new words when tested again the next day. Second, children with better existing vocabulary knowledge showed larger overnight gains in new word comprehension. Counter to expectations, overnight gains in comprehension were larger if the story was read 3-5 h before bedtime rather than at bedtime. These ecologically valid findings are consistent with theories that characterize word learning as a prolonged process supported by mechanisms such as consolidation and retrieval practice, with existing vocabulary knowledge acting as an important source of variability in retention. The findings provide preliminary evidence that encountering new words in stories later in the day (but not too close to sleep) may help to harness vocabulary growth and may be more beneficial than leaving shared storybook reading just for bedtime.
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Nadel L. Some implications of postnatal hippocampal development. Hippocampus 2021; 32:98-107. [PMID: 34133050 DOI: 10.1002/hipo.23369] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Revised: 03/24/2021] [Accepted: 05/26/2021] [Indexed: 11/09/2022]
Abstract
It is well established that in most species, the hippocampus shows extensive postnatal development. This delayed maturation has a number of implications, which can be thought of in three categories. First, the late maturation has the direct effect of depriving the developing organism of at least some of the functions of the hippocampus, in particular place learning, context coding and in humans, episodic memory. Second, such learning that does occur very early in life, prior to hippocampal maturation, will largely bear the imprint and properties of those brain systems that, unlike the hippocampus, are fully functional early in life. Third, the active state of development of hippocampus in the first weeks and months of life render this structure susceptible to disruption by environmental and/or chromosomal factors. In this article, I discuss my efforts, with many colleagues over the past 40 years, to understand each of these implications.
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Affiliation(s)
- Lynn Nadel
- Cognitive Science Program and Department of Psychology, University of Arizona, Tucson, Arizona, USA
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Liu J, Chen Y, Stephens R, Cornea E, Goldman B, Gilmore JH, Gao W. Hippocampal functional connectivity development during the first two years indexes 4-year working memory performance. Cortex 2021; 138:165-177. [PMID: 33691225 PMCID: PMC8058274 DOI: 10.1016/j.cortex.2021.02.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 11/03/2020] [Accepted: 02/05/2021] [Indexed: 02/08/2023]
Abstract
The hippocampus is a key limbic region involved in higher-order cognitive processes including learning and memory. Although both typical and atypical functional connectivity patterns of the hippocampus have been well-studied in adults, the developmental trajectory of hippocampal connectivity during infancy and how it relates to later working memory performance remains to be elucidated. Here we used resting state fMRI (rsfMRI) during natural sleep to examine the longitudinal development of hippocampal functional connectivity using a large cohort (N = 202) of infants at 3 weeks (neonate), 1 year, and 2 years of age. Next, we used multivariate modeling to investigate the relationship between both cross-sectional and longitudinal growth in hippocampal connectivity and 4-year working memory outcome. Results showed robust local functional connectivity of the hippocampus in neonates with nearby limbic and subcortical regions, with dramatic maturation and increasing connectivity with key default mode network (DMN) regions resulting in adult-like topology of the hippocampal functional connectivity by the end of the first year. This pattern was stabilized and further consolidated by 2 years of age. Importantly, cross-sectional and longitudinal measures of hippocampal connectivity in the first year predicted subsequent behavioral measures of working memory at 4 years of age. Taken together, our findings provide insight into the development of hippocampal functional circuits underlying working memory during this early critical period.
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Affiliation(s)
- Janelle Liu
- Biomedical Imaging Research Institute, Department of Biomedical Sciences, and Imaging, Cedars-Sinai Medical Center, Los Angeles, CA, USA.
| | - Yuanyuan Chen
- Biomedical Imaging Research Institute, Department of Biomedical Sciences, and Imaging, Cedars-Sinai Medical Center, Los Angeles, CA, USA.
| | - Rebecca Stephens
- Department of Psychiatry, University of North Carolina Chapel Hill, Chapel Hill, NC, USA.
| | - Emil Cornea
- Department of Psychiatry, University of North Carolina Chapel Hill, Chapel Hill, NC, USA.
| | - Barbara Goldman
- FPG Child Development Institute and Department of Psychology & Neuroscience, University of North Carolina Chapel Hill, Chapel Hill, NC, USA.
| | - John H Gilmore
- Department of Psychiatry, University of North Carolina Chapel Hill, Chapel Hill, NC, USA.
| | - Wei Gao
- Biomedical Imaging Research Institute, Department of Biomedical Sciences, and Imaging, Cedars-Sinai Medical Center, Los Angeles, CA, USA; David Geffen School of Medicine, University of California, Los Angeles, CA, USA.
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Mason GM, Lokhandwala S, Riggins T, Spencer RMC. Sleep and human cognitive development. Sleep Med Rev 2021; 57:101472. [PMID: 33827030 DOI: 10.1016/j.smrv.2021.101472] [Citation(s) in RCA: 70] [Impact Index Per Article: 23.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Revised: 02/16/2021] [Accepted: 02/17/2021] [Indexed: 12/13/2022]
Abstract
Emerging studies across learning domains have shed light on mechanisms underlying sleep's benefits during numerous developmental periods. In this conceptual review, we survey recent studies of sleep and cognition across infancy, childhood, and adolescence. By summarizing recent findings and integrating across studies with disparate approaches, we provide a novel understanding of sleep's role in human cognitive function. Collectively, these studies point to an interrelation between brain development, sleep, and cognition. Moreover, we point to gaps in our understanding, which inform the agenda for future research in developmental and sleep science.
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Affiliation(s)
- Gina M Mason
- Department of Psychological & Brain Sciences, USA; Neuroscience & Behavior Program, University of Massachusetts, Amherst, USA
| | | | - Tracy Riggins
- Department of Psychology, University of Maryland, College Park, USA
| | - Rebecca M C Spencer
- Department of Psychological & Brain Sciences, USA; Neuroscience & Behavior Program, University of Massachusetts, Amherst, USA; Institute for Applied Life Sciences, University of Massachusetts, Amherst, USA.
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Age-dependent and region-specific alteration of parvalbumin neurons, perineuronal nets and microglia in the mouse prefrontal cortex and hippocampus following obesogenic diet consumption. Sci Rep 2021; 11:5593. [PMID: 33692414 PMCID: PMC7970944 DOI: 10.1038/s41598-021-85092-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Accepted: 02/18/2021] [Indexed: 02/08/2023] Open
Abstract
Emergent evidence demonstrates that excessive consumption of high fat and high sugar (HFHS) diets has negative consequences on hippocampal and prefrontal cortex (PFC) function. Moreover, the delayed maturation of the PFC including the late development of parvalbumin-expressing (PV) interneurons and perineuronal nets (PNNs) may promote vulnerability to HFHS diet-induced nutritional stress. However, the young brain may have some resistance to diet-induced neuroinflammation. Thus, we examined the impact of a HFHS diet commencing either in adolescence or adulthood in male mice. PV interneurons, PNNs and microglia were assessed using immunohistochemistry. We observed greater numbers of PV neurons and PNNs in the hippocampus and the prelimbic and infralimbic PFC in adult mice in comparison to our younger cohort. Mice that consumed HFHS diet as adults had reduced numbers of hippocampal PV neurons and PNNs, which correlated with adiposity. However, we saw no effects of diet on PV and PNNs in the PFC. HFHS diet increased microgliosis in the adult cohort, and morphological changes to microglia were observed in the PFC and hippocampus of the adolescent cohort, with a shift to activated microglia phenotypes. Taken together, these findings demonstrate different regional and age-specific effects of obesogenic diets on PV neurons, PNNs and microglia.
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The effect of napping and nighttime sleep on memory in infants. ADVANCES IN CHILD DEVELOPMENT AND BEHAVIOR 2021; 60:31-56. [PMID: 33641798 DOI: 10.1016/bs.acdb.2020.08.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
During the first year of life, infants devote the majority of their time to sleep. Research in adults has shown that sleep supports a variety of memory processes. Surprisingly, sleep's function for infant memory has only started to receive attention in research. In this chapter, we will describe age-related changes in sleep and in memory processing over the first years of life, as well as methods to capture both sleep and memory. Then, we will review current findings on the effects of sleep on memory processing in infants. Lastly, we will also point out gaps in current knowledge and describe potential avenues for future research. Overall, the results of recent experimental studies provide evidence that timely, extended napping is involved in how memories are encoded and stored in the long-term and contribute to the formation of knowledge networks in infants.
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Luongo A, Lukowski A, Protho T, Van Vorce H, Pisani L, Edgin J. Sleep's role in memory consolidation: What can we learn from atypical development? ADVANCES IN CHILD DEVELOPMENT AND BEHAVIOR 2021; 60:229-260. [PMID: 33641795 DOI: 10.1016/bs.acdb.2020.08.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Research conducted over the last century has suggested a role for sleep in the processes guiding healthy cognition and development, including memory consolidation. Children with intellectual and developmental disabilities (IDDs) tend to have higher rates of sleep disturbances, which could relate to behavior issues, developmental delays, and learning difficulties. While several studies examine whether sleep exacerbates daytime difficulties and attention deficits in children with IDDs, this chapter focuses on the current state of knowledge regarding sleep and memory consolidation in typically developing (TD) groups and those at risk for learning difficulties. In particular, this chapter summarizes the current literature on sleep-dependent learning across developmental disabilities, including Down syndrome, Williams syndrome, Autism Spectrum Disorder, and Learning Disabilities (Attention-Deficit/Hyperactivity Disorder and Dyslexia). We also highlight the gaps in the current literature and identify challenges in studying sleep-dependent memory in children with different IDDs. This burgeoning new field highlights the importance of considering the role of sleep in memory retention across long delays when evaluating children's memory processes. Further, an understanding of typical and atypical development can mutually inform recent theories of sleep's role in memory.
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Affiliation(s)
- A Luongo
- Department of Psychology, University of Arizona, Tucson, AZ, Unites States
| | - A Lukowski
- Department of Psychological Sciences, University of California Irvine, Irvine, CA, United States
| | - T Protho
- Department of Psychology, University of Arizona, Tucson, AZ, Unites States
| | - H Van Vorce
- Department of Psychology, University of Arizona, Tucson, AZ, Unites States
| | - L Pisani
- Department of Psychology, University of Arizona, Tucson, AZ, Unites States
| | - J Edgin
- Department of Psychology, University of Arizona, Tucson, AZ, Unites States; University of Arizona Sonoran UCEDD, Tucson, AZ, United States.
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Visco DB, Toscano AE, Juárez PAR, Gouveia HJCB, Guzman-Quevedo O, Torner L, Manhães-de-Castro R. A systematic review of neurogenesis in animal models of early brain damage: Implications for cerebral palsy. Exp Neurol 2021; 340:113643. [PMID: 33631199 DOI: 10.1016/j.expneurol.2021.113643] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 02/04/2021] [Accepted: 02/12/2021] [Indexed: 02/08/2023]
Abstract
Brain damage during early life is the main factor in the development of cerebral palsy (CP), which is one of the leading neurodevelopmental disorders in childhood. Few studies, however, have focused on the mechanisms of cell proliferation, migration, and differentiation in the brain of individuals with CP. We thus conducted a systematic review of preclinical evidence of structural neurogenesis in early brain damage and the underlying mechanisms involved in the pathogenesis of CP. Studies were obtained from Embase, Pubmed, Scopus, and Web of Science. After screening 2329 studies, 29 studies, covering a total of 751 animals, were included. Prenatal models based on oxygen deprivation, inflammatory response and infection, postnatal models based on oxygen deprivation or hypoxic-ischemia, and intraventricular hemorrhage models showed varying neurogenesis responses according to the nature of the brain damage, the time period during which the brain injury occurred, proliferative capacity, pattern of migration, and differentiation profile in neurogenic niches. Results mainly from rodent studies suggest that prenatal brain damage impacts neurogenesis and curbs generation of neural stem cells, while postnatal models show increased proliferation of neural precursor cells, improper migration, and reduced survival of new neurons.
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Affiliation(s)
- Diego Bulcão Visco
- Post Graduate Program in Nutrition, Health Sciences Center, Federal University of Pernambuco, Recife, Pernambuco, Brazil; Studies in Nutrition and Phenotypic Plasticity Unit, Department of Nutrition, Federal University of Pernambuco, Recife, Pernambuco, Brazil
| | - Ana Elisa Toscano
- Studies in Nutrition and Phenotypic Plasticity Unit, Department of Nutrition, Federal University of Pernambuco, Recife, Pernambuco, Brazil; Department of Nursing, CAV, Federal University of Pernambuco, Vitória de Santo Antão, Pernambuco, Brazil; Post Graduate Program in Neuropsychiatry and Behavioral Sciences, Federal University of Pernambuco, Recife, Pernambuco, Brazil
| | - Pedro Alberto Romero Juárez
- Centro de Investigación Biomédica de Michoacán, Instituto Mexicano del Seguro Social, Morelia, Michoacán, Mexico
| | - Henrique José Cavalcanti Bezerra Gouveia
- Post Graduate Program in Nutrition, Health Sciences Center, Federal University of Pernambuco, Recife, Pernambuco, Brazil; Studies in Nutrition and Phenotypic Plasticity Unit, Department of Nutrition, Federal University of Pernambuco, Recife, Pernambuco, Brazil
| | - Omar Guzman-Quevedo
- Instituto Tecnológico Superior de Tacámbaro, Tacámbaro, Michoacán, Mexico; Centro de Investigación Biomédica de Michoacán, Instituto Mexicano del Seguro Social, Morelia, Michoacán, Mexico; Post Graduate Program in Neuropsychiatry and Behavioral Sciences, Federal University of Pernambuco, Recife, Pernambuco, Brazil
| | - Luz Torner
- Centro de Investigación Biomédica de Michoacán, Instituto Mexicano del Seguro Social, Morelia, Michoacán, Mexico
| | - Raul Manhães-de-Castro
- Post Graduate Program in Nutrition, Health Sciences Center, Federal University of Pernambuco, Recife, Pernambuco, Brazil; Studies in Nutrition and Phenotypic Plasticity Unit, Department of Nutrition, Federal University of Pernambuco, Recife, Pernambuco, Brazil.
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Mooney LN, Johnson EG, Prabhakar J, Ghetti S. Memory-related hippocampal activation during sleep and temporal memory in toddlers. Dev Cogn Neurosci 2020; 47:100908. [PMID: 33395613 PMCID: PMC7785886 DOI: 10.1016/j.dcn.2020.100908] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Revised: 12/11/2020] [Accepted: 12/17/2020] [Indexed: 11/12/2022] Open
Abstract
Two-year-olds played tablet games requiring them to remember locations visited by characters and the temporal order with which they visited them. Two-year-olds remembered spatial locations better than temporal order immediately after learning, and after a 20-minute and one-week delay. Song-related hippocampal activation during sleep is associated with memory for temporal order.
Nonhuman research has implicated developmental processes within the hippocampus in the emergence and early development of episodic memory, but research in humans has been constrained by the difficulty of examining hippocampal function during early development. In the present study, we assessed 48 2-year-olds with a novel paradigm in which participants completed two games on a tablet that required remembering associations between unique characters, the places they visited, and the temporal order with which they did so. At the completion of each game, a unique, novel song played. Toddlers remembered spatial locations better than temporal order during an immediate test, after a 20-minute delay, and after a week delay. After the last behavioral session, toddlers underwent an fMRI task during natural nocturnal sleep evaluating hippocampal activation in response to learned and novel songs. We found that the extent of hippocampal activation for learned songs compared to novel songs during sleep was correlated with memory for temproal order across all time delays, but not with memory for spatial locations. The results confirm that that the functional contribution of the hippocampus to early memory can be assessed during sleep and suggest that assessment of temporal aspects of memory in the current task best capture this contribution.
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Affiliation(s)
- Lindsey N Mooney
- Center for Mind and Brain, University of California, Davis, United States; Department of Psychology, University of California, Davis, United States.
| | - Elliott G Johnson
- Center for Mind and Brain, University of California, Davis, United States; Human Development Graduate Group, University of California, Davis, United States
| | - Janani Prabhakar
- Center for Mind and Brain, University of California, Davis, United States
| | - Simona Ghetti
- Center for Mind and Brain, University of California, Davis, United States; Human Development Graduate Group, University of California, Davis, United States; Department of Psychology, University of California, Davis, United States.
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37
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The Ontogeny of Hippocampus-Dependent Memories. J Neurosci 2020; 41:920-926. [PMID: 33328296 DOI: 10.1523/jneurosci.1651-20.2020] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 10/16/2020] [Accepted: 10/20/2020] [Indexed: 11/21/2022] Open
Abstract
The formation of memories that contain information about the specific time and place of acquisition, which are commonly referred to as "autobiographical" or "episodic" memories, critically relies on the hippocampus and on a series of interconnected structures located in the medial temporal lobe of the mammalian brain. The observation that adults retain very few of these memories from the first years of their life has fueled a long-standing debate on whether infants can make the types of memories that in adults are processed by the hippocampus-dependent memory system, and whether the hippocampus is involved in learning and memory processes early in life. Recent evidence shows that, even at a time when its circuitry is not yet mature, the infant hippocampus is able to produce long-lasting memories. However, the ability to acquire and store such memories relies on molecular pathways and network-based activity dynamics different from the adult system, which mature with age. The mechanisms underlying the formation of hippocampus-dependent memories during infancy, and the role that experience exerts in promoting the maturation of the hippocampus-dependent memory system, remain to be understood. In this review, we discuss recent advances in our understanding of the ontogeny and the biological correlates of hippocampus-dependent memories.
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Ghetti S, Fandakova Y. Neural Development of Memory and Metamemory in Childhood and Adolescence: Toward an Integrative Model of the Development of Episodic Recollection. ACTA ACUST UNITED AC 2020. [DOI: 10.1146/annurev-devpsych-060320-085634] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Memory and metamemory processes are essential to retrieve detailed memories and appreciate the phenomenological experience of recollection. Developmental cognitive neuroscience has made strides in revealing the neural changes associated with improvements in memory and metamemory during childhood and adolescence. We argue that hippocampal changes, in concert with surrounding cortical regions, support developmental improvements in the precision, complexity, and flexibility of memory representations. In contrast, changes in frontoparietal regions promote efficient encoding and retrieval strategies. A smaller body of literature on the neural substrates of metamemory development suggests that error monitoring processes implemented in the anterior insula and dorsal anterior cingulate cortex trigger, and perhaps support the development of, metacognitive evaluationsin the prefrontal cortex, while developmental changes in the parietal cortex support changes in the phenomenological experience of episodic retrieval. Our conclusions highlight the necessity of integrating these lines of research into a comprehensive model on the neurocognitive development of episodic recollection.
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Affiliation(s)
- Simona Ghetti
- Department of Psychology and Center for Mind and Brain, University of California, Davis, California 95618, USA
| | - Yana Fandakova
- Center for Lifespan Psychology, Max Planck Institute for Human Development, 14195 Berlin, Germany
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Howell AL, Osher DE, Li J, Saygin ZM. The intrinsic neonatal hippocampal network: rsfMRI findings. J Neurophysiol 2020; 124:1458-1468. [DOI: 10.1152/jn.00362.2020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Although both animal data and human data suggest that the hippocampus is immature at birth, to date, there are no direct assessments of human hippocampal functional connectivity (FC) very early in life. Our study explores the FC of the hippocampus to the cortex at birth, allowing insight into the development of human memory systems. In particular, we find that adults and neonates exhibit vastly different hippocampal connectivity profiles—a finding that likely has large developmental implications.
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Affiliation(s)
- Athena L. Howell
- Department of Neuroscience, The Ohio State University, Columbus, Ohio
| | - David E. Osher
- Department of Psychology, The Ohio State University, Columbus, Ohio
| | - Jin Li
- Department of Psychology, The Ohio State University, Columbus, Ohio
| | - Zeynep M. Saygin
- Department of Psychology, The Ohio State University, Columbus, Ohio
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40
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Konrad C, Adolph D, Herbert JS, Neuhoff L, Mohr C, Jagusch-Poirier J, Seehagen S, Weigelt S, Schneider S. A New 3-Day Standardized Eyeblink Conditioning Protocol to Assess Extinction Learning From Infancy to Adulthood. Front Behav Neurosci 2020; 14:135. [PMID: 32922270 PMCID: PMC7457038 DOI: 10.3389/fnbeh.2020.00135] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Accepted: 07/13/2020] [Indexed: 11/25/2022] Open
Abstract
Associative learning can be observed from the neonatal period onward, providing opportunities to examine changes in basic learning and memory abilities. One method that is suitable to study associative learning is classical eyeblink conditioning (EBC) which is dependent on the cerebellum. Extinction learning can be systematically investigated in this paradigm by varying the context during learning and extinction. Because of methodological difficulties and ethical challenges, no studies have compared extinction learning using EBC across human development. Our goal was to test feasibility of a 3-day delay EBC paradigm that can be used from infancy to adulthood. Acceptance/safety was tested especially for infancy by investigating attrition rates and parental report on infant wellbeing. On a paradigm side, we tested if the paradigm leads to successful acquisition and extinction. An air puff served as unconditional stimulus (US) and a tone as conditional stimulus (CS). On day 1 during acquisition, participants received 36 US–CS pairings in context A. On day 2, participants received 12 acquisition trials in context A to consolidate association learning, followed by 48 extinction trials (tone alone presentations) in context B. Renewal was assessed on day 3 and incorporated 12 CS alone trials presented in both the acquisition context and the extinction context. Eyeblink responses were videotaped and coded offline. The protocol was tested with 12–36-months-old infants (N = 72), adolescents (N = 8), and adults (N = 8). Concerning the acceptance/safety side, attrition ranged from 21 to 58% in infant samples due to the complex preparation of the children for the paradigm. However, attrition is equal to or lower than other infant learning paradigms. Parents of infant samples were very interested in the paradigm and reported low levels of infant stress, exhaustion, and negative feelings during the sessions. Data quality was very high, and no participant had to be excluded because of insufficient data. Concerning the paradigm side, participants showed successful acquisition and extinction as a group. The procedure is ethically sound, feasible, tolerated by many infants, and acceptable among parents. The data show successful acquisition and extinction rates, making the paradigm a valuable tool for investigating developmental changes in extinction learning over the lifespan.
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Affiliation(s)
- Carolin Konrad
- Faculty of Psychology, Clinical Child and Adolescent Psychology, Mental Health Research and Treatment Center, Ruhr University Bochum, Bochum, Germany
| | - Dirk Adolph
- Faculty of Psychology, Clinical Child and Adolescent Psychology, Mental Health Research and Treatment Center, Ruhr University Bochum, Bochum, Germany
| | - Jane S Herbert
- Wollongong Infant Learning Lab, School of Psychology and Early Start, University of Wollongong, Wollongong, NSW, Australia
| | - Lina Neuhoff
- Faculty of Psychology, Clinical Child and Adolescent Psychology, Mental Health Research and Treatment Center, Ruhr University Bochum, Bochum, Germany
| | - Cornelia Mohr
- Abteilung für Kinderschutz, Vestische Kinder- und Jugendklinik Datteln, Universität Witten/Herdecke, Datteln, Germany
| | - Julie Jagusch-Poirier
- Vision, Visual Impairments & Blindness, Faculty of Rehabilitation Sciences, Technical University, Dortmund University, Dortmund, Germany
| | - Sabine Seehagen
- Developmental Psychology, Faculty of Psychology, Ruhr University Bochum, Bochum, Germany
| | - Sarah Weigelt
- Vision, Visual Impairments & Blindness, Faculty of Rehabilitation Sciences, Technical University, Dortmund University, Dortmund, Germany
| | - Silvia Schneider
- Faculty of Psychology, Clinical Child and Adolescent Psychology, Mental Health Research and Treatment Center, Ruhr University Bochum, Bochum, Germany
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Mestre Z, Grethe AB, Wierenga CE, Jernigan T, Eichen DM, Chang L, Ernst T, Boutelle KN. Associations Between Body Weight, Hippocampal Volume, and Tissue Signal Intensity in 12- to 18-Year-Olds. Obesity (Silver Spring) 2020; 28:1325-1331. [PMID: 32501641 PMCID: PMC7927957 DOI: 10.1002/oby.22841] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 04/14/2020] [Accepted: 04/15/2020] [Indexed: 01/06/2023]
Abstract
OBJECTIVE The hippocampus is a key structure in feeding behaviors and weight regulation. Obesity may lead to disruptions in hippocampal structure. In animals, obesity-related factors (e.g., high-fat/sugar foods) are associated with hippocampal insult (e.g., alterations in the blood brain barrier). In humans, individuals with obesity, relative to healthy weight, have smaller hippocampal volumes. Few studies have examined the association between body weight and the hippocampus during adolescence, a critical brain development period. This study examined hippocampal volume and tissue signal intensity in adolescents across the weight spectrum. METHODS Structural magnetic resonance imaging and anthropomorphic data were available for 102 12- to 18-year-old adolescents (53% female; 15.07 [SD 1.84] years; standardized BMI [BMIz] scores using the Centers for Disease Control and Prevention growth charts: 0.54 [SD 1.17]) from the Pediatric Imaging, Neurocognition, and Genetics database. Linear regression models controlling for age, sex, genetic ancestry, scanner, and household income examined the relationship between BMIz, hippocampal volume, and T2-weighted hippocampal signal intensity. RESULTS BMIz was negatively associated with T2-weighted hippocampal signal intensity in the left (t = -3.05; P = 0.003; r = -0.21) and right (t = -2.50; P = 0.01; r = -0.36) hippocampi. BMIz was not significantly associated with hippocampal volume. CONCLUSIONS BMIz is associated with hippocampal tissue characteristics during adolescence, which could impact later brain development.
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Affiliation(s)
- Zoe Mestre
- SDSU/UC San Diego Joint Doctoral Program in Clinical Psychology
- Department of Psychiatry, University of California San Diego, La Jolla CA, USA
| | | | - Christina E. Wierenga
- Department of Psychiatry, University of California San Diego, La Jolla CA, USA
- Veterans Affairs San Diego Healthcare System,Research Service, San Diego CA, USA
| | - Terry Jernigan
- Department of Cognitive Science, University of California San Diego, La Jolla CA, USA
| | - Dawn M. Eichen
- Department of Pediatrics, University of California San Diego, La Jolla CA, USA
| | - Linda Chang
- Department of Diagnostic Radiology and Nuclear Medicine, and Departrment of Neurology, University of Maryland School of Medecine, Baltimore MD, USA
| | - Thomas Ernst
- Department of Diagnostic Radiology and Nuclear Medicine, and Departrment of Neurology, University of Maryland School of Medecine, Baltimore MD, USA
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Kerri N. Boutelle
- Department of Psychiatry, University of California San Diego, La Jolla CA, USA
- Department of Pediatrics, University of California San Diego, La Jolla CA, USA
- Department of Family Medicine and Public Health, University of California San Diego, La Jolla, CA, USA
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Cognitive impairment in angiographically negative subarachnoid haemorrhage: A case-matched prospective study 1-year post-incident. Cortex 2020; 128:49-60. [PMID: 32315835 DOI: 10.1016/j.cortex.2020.03.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 11/25/2019] [Accepted: 03/12/2020] [Indexed: 12/28/2022]
Abstract
INTRODUCTION Few studies investigate cognitive outcomes in patients with angiographically negative subarachnoid haemorrhage (anSAH), which is traditionally viewed as a condition with an excellent prognosis. The aim of this study was to assess neuropsychological outcomes in a prospective cohort of anSAH patients 1-year post-event. METHOD This prospective case-controlled study of cognitive function in patients with anSAH (n = 38) recruited from the national centre for neurosurgery and compared matched controls (n = 28). The cognitive battery assessed memory, executive function, attention, visuo-spatial function, processing speed, social cognition, language, and mood. Patients were matched to controls on age, education, and premorbid intelligence. RESULTS Multivariate Analysis of Variance (MANOVA) were used. Patients performed significantly worse than controls on all cognitive domain composite scores. anSAH patients had a higher frequency of impairment within encoding, executive, and processing speed domains when compared to healthy controls. Discriminant Function Analysis (DFA) indicated high sensitivity and specificity to detect cognitive impairment between groups. CONCLUSION Although the majority of patients with anSAH make an excellent physical recovery, our data show a high rate of cognitive dysfunction in patients 1-year post-incident. Cognitive impairment in anSAH is not a universal feature, and its manifestations may be more heterogeneous than previously recognised. Some impairment may be mediated by impaired speed of processing which negatively influences other cognitive domains. The profile of cognitive impairment supports a neurotoxicity hypothesis, which suggests that blood in the subarachnoid space, rather than the bleed per se, results in a diffuse pattern of cognitive deficits.
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Lobzhanidze G, Japaridze N, Lordkipanidze T, Rzayev F, MacFabe D, Zhvania M. Behavioural and brain ultrastructural changes following the systemic administration of propionic acid in adolescent male rats. Further development of a rodent model of autism. Int J Dev Neurosci 2020; 80:139-156. [PMID: 31997401 DOI: 10.1002/jdn.10011] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 01/08/2020] [Accepted: 01/19/2020] [Indexed: 12/18/2022] Open
Abstract
Short chain fatty acids, produced as gut microbiome metabolites but also present in the diet, exert broad effects in host physiology. Propionic acid (PPA), along with butyrate and acetate, plays a growing role in health, but also in neurological conditions. Increased PPA exposure in humans, animal models and cell lines elicit diverse behavioural and biochemical changes consistent with organic acidurias, mitochondrial disorders and autism spectrum disorders (ASD). ASD is considered a disorder of synaptic dysfunction and cell signalling, but also neuroinflammatory and neurometabolic components. We examined behaviour (Morris water and radial arm mazes) and the ultrastructure of the hippocampus and medial prefrontal cortex (electron microscopy) following a single intraperitoneal (i.p.) injection of PPA (175 mg/kg) in male adolescent rats. PPA treatment showed altered social and locomotor behaviour without changes in learning and memory. Both transient and enduring ultrastructural alterations in synapses, astro- and microglia were detected in the CA1 hippocampal area. Electron microscopic analysis showed the PPA treatment significantly decreased the total number of synaptic vesicles, presynaptic mitochondria and synapses with a symmetric active zone. Thus, brief systemic administration of this dietary and enteric short chain fatty acid produced behavioural and dynamic brain ultrastructural changes, providing further validation of the PPA model of ASD.
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Affiliation(s)
- Giorgi Lobzhanidze
- School of Natural Sciences and Medicine, Ilia State University, Tbilisi, Georgia.,Department of Brain Ultrastructure and Nanoarchitecture, I. Beritashvili Center of Experimental Biomedicine, Tbilisi, Georgia
| | - Nadezhda Japaridze
- Department of Brain Ultrastructure and Nanoarchitecture, I. Beritashvili Center of Experimental Biomedicine, Tbilisi, Georgia.,Medical School, New Vision University, Tbilisi, Georgia
| | - Tamar Lordkipanidze
- School of Natural Sciences and Medicine, Ilia State University, Tbilisi, Georgia.,Department of Brain Ultrastructure and Nanoarchitecture, I. Beritashvili Center of Experimental Biomedicine, Tbilisi, Georgia
| | - Fuad Rzayev
- Laboratory of Electron Microscopy, Research Center of Azerbaijan Medical University, Baku, Azerbaijan
| | - Derrick MacFabe
- The Kilee Patchell-Evans Autism Research Group, London, ON, Canada.,Faculty of Medicine, Department of Microbiology, Center for Healthy Eating and Food Innovation, Maastricht University, Maastricht, the Netherlands
| | - Mzia Zhvania
- School of Natural Sciences and Medicine, Ilia State University, Tbilisi, Georgia.,Department of Brain Ultrastructure and Nanoarchitecture, I. Beritashvili Center of Experimental Biomedicine, Tbilisi, Georgia
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44
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Johnson EG, Prabhakar J, Mooney LN, Ghetti S. Neuroimaging the sleeping brain: Insight on memory functioning in infants and toddlers. Infant Behav Dev 2020; 58:101427. [PMID: 32085988 PMCID: PMC7089830 DOI: 10.1016/j.infbeh.2020.101427] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Revised: 02/06/2020] [Accepted: 02/07/2020] [Indexed: 02/06/2023]
Abstract
Episodic memory, or the ability to remember past events with specific detail, is central to the human experience and is related to learning and adaptive functioning in a variety of domains. In typically developing children, episodic memory emerges during infancy and improves during early childhood and beyond. Developmental processes within the hippocampus are hypothesized to be primarily responsible for both the early emergence and persistence of episodic memory in late infancy and early childhood. However, these hypotheses are based on non-human models. In-vivo investigations in early human development of hippocampal processes have been significantly limited by methodological challenges in acquiring neuroimaging data, particularly task-related functional neuroimaging data, from infants and toddlers. Recent studies in adults have shown neural activity in the brain regions supporting episodic memory during slow-wave sleep using functional magnetic resonance imaging (fMRI), and fMRI has been increasingly utilized in infancy and early childhood to address other research questions. We review initial evidence and present preliminary data showing the promise of this approach for examining hippocampal contribution to how infants and toddlers remember individual events, and their association with information about the context in which the event occurred. Overall, our review, integrated with the presentation of some preliminary data provides insight on leveraging sleep to gain new perspectives on early memory functioning.
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Affiliation(s)
- Elliott Gray Johnson
- Center for Mind and Brain, University of California, Davis, United States; Human Development Graduate Group, University of California, Davis, United States.
| | - Janani Prabhakar
- Center for Mind and Brain, University of California, Davis, United States
| | - Lindsey N Mooney
- Center for Mind and Brain, University of California, Davis, United States; Department of Psychology, University of California, Davis, United States
| | - Simona Ghetti
- Center for Mind and Brain, University of California, Davis, United States; Department of Psychology, University of California, Davis, United States; Human Development Graduate Group, University of California, Davis, United States
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45
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Bessières B, Travaglia A, Mowery TM, Zhang X, Alberini CM. Early life experiences selectively mature learning and memory abilities. Nat Commun 2020; 11:628. [PMID: 32005863 PMCID: PMC6994621 DOI: 10.1038/s41467-020-14461-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Accepted: 01/09/2020] [Indexed: 01/24/2023] Open
Abstract
The mechanisms underlying the maturation of learning and memory abilities are poorly understood. Here we show that episodic learning produces unique biological changes in the hippocampus of infant rats and mice compared to juveniles and adults. These changes include persistent neuronal activation, BDNF-dependent increase in the excitatory synapse markers synaptophysin and PSD-95, and significant maturation of AMPA receptor synaptic responses. Inhibition of PSD-95 induction following learning impairs both AMPA receptor response maturation and infantile memory, indicating that the synapse formation/maturation is necessary for creating infantile memories. Conversely, capturing the learning-induced changes by presenting a subsequent learning experience or by chemogenetic activation of the neural ensembles tagged by learning matures memory functional competence. This memory competence is selective for the type of experience encountered, as it transfers within similar hippocampus-dependent learning domains but not to other hippocampus-dependent types of learning. Thus, experiences in early life produce selective maturation of memory abilities.
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Affiliation(s)
- Benjamin Bessières
- Center for Neural Science, New York University, New York, NY, 10003, USA
| | - Alessio Travaglia
- Center for Neural Science, New York University, New York, NY, 10003, USA
| | - Todd M Mowery
- Center for Neural Science, New York University, New York, NY, 10003, USA
| | - Xinying Zhang
- Center for Neural Science, New York University, New York, NY, 10003, USA
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Rebuschat P, Monaghan P. Editors' Introduction: Aligning Implicit Learning and Statistical Learning: Two Approaches, One Phenomenon. Top Cogn Sci 2020; 11:459-467. [PMID: 31338981 DOI: 10.1111/tops.12438] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 06/14/2019] [Accepted: 06/14/2019] [Indexed: 11/29/2022]
Abstract
This editors' introduction provides the background to the special issue. We first outline the rationale for bringing together, in a single volume, leading researchers from two distinct, yet related research strands, implicit learning and statistical learning. The aim of the special issue is to facilitate the development of a shared understanding of research questions and methodologies, to provide a platform for discussing similarities and differences between the two strands, and to encourage the formulation of joint research agendas. We then introduce the new contributions solicited for this special issue and provide our perspective on the agenda setting that results from combining these two approaches.
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Affiliation(s)
- Patrick Rebuschat
- Department of Linguistics and English Language, Lancaster University.,LEAD Graduate School and Research Network, University of Tübingen
| | - Padraic Monaghan
- Department of English, University of Amsterdam.,Department of Psychology, Lancaster University
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Abstract
Learning abilities are present in infancy, as they are critical for adaptation. From simple habituation and novelty responses to stimuli, learning capacities evolve throughout the lifespan. During development, learning abilities become more flexible and integrated across sensory modalities, allowing the encoding of more complex information, and in larger amounts. In turn, an increasing knowledge base leads to adaptive changes in behavior, making responses and actions more precise and effective. The objective of this chapter is to review the main behavioral manifestations of human learning abilities in early development and their biologic underpinnings, ranging from the cellular level to neurocognitive systems and mechanisms. We first focus on the ability to learn from repetitions of stimuli and how years of research in this field have recently contributed to theories of fundamental brain mechanisms whose implications for cognitive development are under study. The ability to memorize associations between different items and events is addressed next as we review the variety of contexts in which this associative memory and its neurologic bases come into play. Together, repetition-based learning and associative memory provide powerful means of understanding the surrounding environment, not only through the gathering and consolidation of specific types of information, but also by continually testing and adjusting stored information to better adapt to changing conditions.
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Affiliation(s)
- Marc Philippe Lafontaine
- Research Centre, Centre Hospitalier Universitaire Sainte-Justine, Department of Psychology, Université de Montréal, Montréal, QC, Canada
| | - Inga Sophia Knoth
- Research Centre, Centre Hospitalier Universitaire Sainte-Justine, Department of Psychology, Université de Montréal, Montréal, QC, Canada
| | - Sarah Lippé
- Research Centre, Centre Hospitalier Universitaire Sainte-Justine, Department of Psychology, Université de Montréal, Montréal, QC, Canada.
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Kalantarian G, Ziamajidi N, Abbasalipourkabir R, Mahjub R, Goodarzi MT, Saidijam M, Soleimani Asl S, Jamshidi M. Effect of insulin-loaded trimethyl chitosan nanoparticles on genes expression in the hippocampus of diabetic rats. J Basic Clin Physiol Pharmacol 2019; 31:/j/jbcpp.ahead-of-print/jbcpp-2019-0147/jbcpp-2019-0147.xml. [PMID: 31747376 DOI: 10.1515/jbcpp-2019-0147] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Accepted: 09/06/2019] [Indexed: 11/15/2022]
Abstract
Background Diabetes mellitus is a chronic metabolic disorder that undesirably affects both central and peripheral nervous systems through the apoptosis of neurons. Insulin and insulin-like growth factors (IGFs) inhibit apoptosis of oligodendrocytes. The objective of this study was to determine whether oral insulin in the form of nanoparticles may have similar effects to injectable insulin in increasing the gene expression of IGF1 and IGF2. Methods Insulin-loaded trimethyl chitosan nanoparticles were prepared using the polyelectrolyte complex method and characterized for size, polydispersity index, zeta potential, drug loading, and entrapment efficiency. An in vivo study was performed in different groups of male Wistar rats with diabetes mellitus type 1 treated with insulin-loaded trimethyl chitosan nanoparticles and subcutaneous injection of trade insulin (neutral protamine Hagedorn). The hippocampus of rats were studied for the expression of IGF1 and IGF2 genes by using real-time PCR, and the fold changes in gene expression were evaluated using the 2-ΔΔCt method. Results The expression of IGF1 and IGF2 genes in the groups treated with nano-insulin and injected insulin were significantly higher than that in the diabetic control group (p<0.001) and meaningfully lower than that in the healthy control group. However, there was no significant difference to the treated groups. Conclusion Our findings suggest that future research might provide a new formulation of drugs for treating type 1 diabetes, in the form of oral insulin.
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Affiliation(s)
- Giti Kalantarian
- Department of Biochemistry, School of Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Nasrin Ziamajidi
- Department of Biochemistry, School of Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
| | | | - Reza Mahjub
- Department of Pharmaceutics, School of Pharmacy, Hamadan University of Medical Sciences, Hamadan, Iran
| | | | - Massoud Saidijam
- Research Center for Molecular Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Sara Soleimani Asl
- Endometrium and Endometriosis Research Centre, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Mohammad Jamshidi
- Department of Laboratory Sciences, School of Allied Medicine, Lorestan University of Medical Sciences, Khorramabad, Iran
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During infant maltreatment, stress targets hippocampus, but stress with mother present targets amygdala and social behavior. Proc Natl Acad Sci U S A 2019; 116:22821-22832. [PMID: 31636210 DOI: 10.1073/pnas.1907170116] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Infant maltreatment increases vulnerability to physical and mental disorders, yet specific mechanisms embedded within this complex infant experience that induce this vulnerability remain elusive. To define critical features of maltreatment-induced vulnerability, rat pups were reared from postnatal day 8 (PN8) with a maltreating mother, which produced amygdala and hippocampal deficits and decreased social behavior at PN13. Next, we deconstructed the maltreatment experience to reveal sufficient and necessary conditions to induce this phenotype. Social behavior and amygdala deficits (volume, neurogenesis, c-Fos, local field potential) required combined chronic high corticosterone and maternal presence (not maternal behavior). Hippocampal deficits were induced by chronic high corticosterone regardless of social context. Causation was shown by blocking corticosterone during maltreatment and suppressing amygdala activity during social behavior testing. These results highlight (1) that early life maltreatment initiates multiple pathways to pathology, each with distinct causal mechanisms and outcomes, and (2) the importance of social presence on brain development.
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50
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Kozareva DA, Cryan JF, Nolan YM. Born this way: Hippocampal neurogenesis across the lifespan. Aging Cell 2019; 18:e13007. [PMID: 31298475 PMCID: PMC6718573 DOI: 10.1111/acel.13007] [Citation(s) in RCA: 75] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 05/31/2019] [Accepted: 06/30/2019] [Indexed: 12/30/2022] Open
Abstract
The capability of the mammalian brain to generate new neurons through the lifespan has gained much attention for the promise of new therapeutic possibilities especially for the aging brain. One of the brain regions that maintains a neurogenesis-permissive environment is the dentate gyrus of the hippocampus. Here, new neurons are generated from a pool of multipotent neural progenitor cells to become fully functional neurons that are integrated into the brain circuitry. A growing body of evidence points to the fact that neurogenesis in the adult hippocampus is necessary for certain memory processes, and in mood regulation, while alterations in hippocampal neurogenesis have been associated with a myriad of neurological and psychiatric disorders. More recently, evidence has come to light that new neurons may differ in their vulnerability to environmental and disease-related influences depending on the time during the life course at which they are exposed. Thus, it has been the topic of intense research in recent years. In this review, we will discuss the complex process and associated functional relevance of hippocampal neurogenesis during the embryonic/postnatal period and in adulthood. We consider the implications of hippocampal neurogenesis during the developmentally critical periods of adolescence and older age. We will further consider the literature surrounding hippocampal neurogenesis and its functional role during these critical periods with a view to providing insight into the potential of harnessing neurogenesis for health and therapeutic benefit.
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Affiliation(s)
- Danka A. Kozareva
- Department of Anatomy & NeuroscienceUniversity College CorkCorkIreland
| | - John F. Cryan
- Department of Anatomy & NeuroscienceUniversity College CorkCorkIreland
- APC Microbiome IrelandUniversity College CorkCorkIreland
| | - Yvonne M. Nolan
- Department of Anatomy & NeuroscienceUniversity College CorkCorkIreland
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