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Ozernov-Palchik O, O’Brien AM, Jiachen Lee E, Richardson H, Romeo R, Lipkin B, Small H, Capella J, Nieto-Castañón A, Saxe R, Gabrieli JDE, Fedorenko E. Precision fMRI reveals that the language network exhibits adult-like left-hemispheric lateralization by 4 years of age. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.05.15.594172. [PMID: 38798360 PMCID: PMC11118489 DOI: 10.1101/2024.05.15.594172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
Abstract
Left hemisphere damage in adulthood often leads to linguistic deficits, but many cases of early damage leave linguistic processing preserved, and a functional language system can develop in the right hemisphere. To explain this early apparent equipotentiality of the two hemispheres for language, some have proposed that the language system is bilateral during early development and only becomes left-lateralized with age. We examined language lateralization using functional magnetic resonance imaging with two large pediatric cohorts (total n=273 children ages 4-16; n=107 adults). Strong, adult-level left-hemispheric lateralization (in activation volume and response magnitude) was evident by age 4. Thus, although the right hemisphere can take over language function in some cases of early brain damage, and although some features of the language system do show protracted development (magnitude of language response and strength of inter-regional correlations in the language network), the left-hemisphere bias for language is robustly present by 4 years of age. These results call for alternative accounts of early equipotentiality of the two hemispheres for language.
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Affiliation(s)
- Ola Ozernov-Palchik
- McGovern Institute for Brain Research, MIT, Cambridge, MA 02139, United States
| | - Amanda M. O’Brien
- McGovern Institute for Brain Research, MIT, Cambridge, MA 02139, United States
- Program in Speech and Hearing Bioscience and Technology, Harvard University, Cambridge, MA 02138, United States
| | - Elizabeth Jiachen Lee
- McGovern Institute for Brain Research, MIT, Cambridge, MA 02139, United States
- Department of Brain and Cognitive Sciences, MIT, Cambridge, MA 02139, United States
| | - Hilary Richardson
- School of Philosophy, Psychology, and Language Sciences, University of Edinburgh, Edinburgh, EH8 9JZ, United Kingdom
| | - Rachel Romeo
- Department of Human Development and Quantitative Methodology, University of Maryland, College Park, MD 20742, United States
| | - Benjamin Lipkin
- McGovern Institute for Brain Research, MIT, Cambridge, MA 02139, United States
- Department of Brain and Cognitive Sciences, MIT, Cambridge, MA 02139, United States
| | - Hannah Small
- Department of Cognitive Science, Johns Hopkins University, Baltimore, MD, 21218, United States
| | - Jimmy Capella
- Department of Psychology and Neuroscience, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, United States
| | | | - Rebecca Saxe
- McGovern Institute for Brain Research, MIT, Cambridge, MA 02139, United States
- Department of Brain and Cognitive Sciences, MIT, Cambridge, MA 02139, United States
| | - John D. E. Gabrieli
- McGovern Institute for Brain Research, MIT, Cambridge, MA 02139, United States
- Department of Brain and Cognitive Sciences, MIT, Cambridge, MA 02139, United States
| | - Evelina Fedorenko
- McGovern Institute for Brain Research, MIT, Cambridge, MA 02139, United States
- Department of Brain and Cognitive Sciences, MIT, Cambridge, MA 02139, United States
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Kou JW, Fan LY, Chen HC, Chen SY, Hu X, Zhang K, Kovelman I, Chou TL. Neural substrates of L2-L1 transfer effects on phonological awareness in young Chinese-English bilingual children. Neuroimage 2024; 291:120592. [PMID: 38548037 PMCID: PMC11032115 DOI: 10.1016/j.neuroimage.2024.120592] [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: 10/09/2023] [Revised: 03/24/2024] [Accepted: 03/25/2024] [Indexed: 04/02/2024] Open
Abstract
The growing trend of bilingual education between Chinese and English has contributed to a rise in the number of early bilingual children, who were exposed to L2 prior to formal language instruction of L1. The L2-L1 transfer effect in an L1-dominant environment has been well established. However, the threshold of L2 proficiency at which such transfer manifests remains unclear. This study investigated the behavioral and neural processes involved when manipulating phonemes in an auditory phonological task to uncover the transfer effect in young bilingual children. Sixty-two first graders from elementary schools in Taiwan were recruited in this study (29 Chinese monolinguals, 33 Chinese-English bilinguals). The brain activity was measured using fNIRS (functional near-infrared spectroscopy). Bilingual children showed right lateralization to process Chinese and left lateralization to process English, which supports more on the accommodation effect within the framework of the assimilation-accommodation hypothesis. Also, compared to monolinguals, bilingual children showed more bilateral frontal activation in Chinese, potentially reflecting a mixed influence from L2-L1 transfer effects and increased cognitive load of bilingual exposure. These results elucidate the developmental adjustments in the neural substrates associated with early bilingual exposure in phonological processing, offering valuable insights into the bilingual learning process.
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Affiliation(s)
- Jia-Wei Kou
- Department of Psychology, National Taiwan University, Taipei, Taiwan
| | - Li-Ying Fan
- Department of Education, National Taipei University of Education, Taipei, Taiwan
| | - Hsin-Chin Chen
- Department of Psychology, National Chung Cheng University, Chiayi, Taiwan
| | - Shiou-Yuan Chen
- Department of Early Childhood Education, University of Taipei, Taipei, Taiwan
| | - Xiaosu Hu
- Department of Psychology, University of Michigan, Ann Arbor, MI, USA
| | - Kehui Zhang
- Department of Psychology, University of Michigan, Ann Arbor, MI, USA
| | - Ioulia Kovelman
- Department of Psychology, University of Michigan, Ann Arbor, MI, USA
| | - Tai-Li Chou
- Department of Psychology, National Taiwan University, Taipei, Taiwan.
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3
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Schroën JAM, Gunter TC, Numssen O, Kroczek LOH, Hartwigsen G, Friederici AD. Causal evidence for a coordinated temporal interplay within the language network. Proc Natl Acad Sci U S A 2023; 120:e2306279120. [PMID: 37963247 PMCID: PMC10666120 DOI: 10.1073/pnas.2306279120] [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: 04/18/2023] [Accepted: 10/06/2023] [Indexed: 11/16/2023] Open
Abstract
Recent neurobiological models on language suggest that auditory sentence comprehension is supported by a coordinated temporal interplay within a left-dominant brain network, including the posterior inferior frontal gyrus (pIFG), posterior superior temporal gyrus and sulcus (pSTG/STS), and angular gyrus (AG). Here, we probed the timing and causal relevance of the interplay between these regions by means of concurrent transcranial magnetic stimulation and electroencephalography (TMS-EEG). Our TMS-EEG experiments reveal region- and time-specific causal evidence for a bidirectional information flow from left pSTG/STS to left pIFG and back during auditory sentence processing. Adapting a condition-and-perturb approach, our findings further suggest that the left pSTG/STS can be supported by the left AG in a state-dependent manner.
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Affiliation(s)
- Joëlle A. M. Schroën
- Department of Neuropsychology, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig04103, Germany
| | - Thomas C. Gunter
- Department of Neuropsychology, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig04103, Germany
| | - Ole Numssen
- Methods and Development Group Brain Networks, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig04103, Germany
- Lise Meitner Research Group Cognition and Plasticity, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig04103, Germany
| | - Leon O. H. Kroczek
- Department of Psychology, Clinical Psychology and Psychotherapy, Universität Regensburg, Regensburg93053, Germany
| | - Gesa Hartwigsen
- Lise Meitner Research Group Cognition and Plasticity, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig04103, Germany
- Cognitive and Biological Psychology, Wilhelm Wundt Institute for Psychology, Leipzig04109, Germany
| | - Angela D. Friederici
- Department of Neuropsychology, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig04103, Germany
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4
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Iyer KK, Bell N, Copland DA, Arnott WL, Wilson WJ, Angwin AJ. Modulations of right hemisphere connectivity in young children relates to the perception of spoken words. Neuropsychologia 2023; 183:108532. [PMID: 36906221 DOI: 10.1016/j.neuropsychologia.2023.108532] [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: 07/15/2022] [Revised: 03/03/2023] [Accepted: 03/03/2023] [Indexed: 03/12/2023]
Abstract
The early school years shape a young brain's capability to comprehend and contextualize words within milliseconds of exposure. Parsing word sounds (phonological interpretation) and word recognition (enabling semantic interpretation) are integral to this process. Yet little is known about the causal mechanisms of cortical activity during these early developmental stages. In this study, we aimed to explore these causal mechanisms via dynamic causal modelling of event-related potentials (ERPs) acquired from 30 typically developing children (ages 6-8 years) as they completed a spoken word-picture matching task. Source reconstruction of high-density electroencephalography (128 channels) was used to ascertain differences in whole-brain cortical activity during semantically "congruent" and "incongruent" conditions. Source activations analyzed during the N400 ERP window identified significant regions-of-interest (pFWE<.05) localized primarily in the right hemisphere when contrasting congruent and incongruent word-picture stimuli. Dynamic causal models (DCMs) were tested on source activations in the fusiform gyrus (rFusi), inferior parietal lobule (rIPL), inferior temporal gyrus (rITG) and superior frontal gyrus (rSFG). DCM results indicated that a fully connected bidirectional model with self-(inhibiting) connections over rFusi, rIPL and rSFG provided the highest model evidence, based on exceedance probabilities derived from Bayesian statistical inferences. Connectivity parameters of rITG and rSFG regions from the winning DCM were negatively correlated with behavioural measures of receptive vocabulary and phonological memory (pFDR<.05), such that lower scores on these assessments corresponded with increased connectivity between temporal pole and anterior frontal regions. The findings suggest that children with lower language processing skills required increased recruitment of right hemisphere frontal/temporal areas during task performance.
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Affiliation(s)
- Kartik K Iyer
- Child Health Research Centre, Faculty of Medicine, The University of Queensland, South Brisbane, 4101, QLD, Brisbane, Australia; QIMR Berghofer Medical Research Institute, Brisbane, QLD, 4006, Australia.
| | - Nicola Bell
- School of Health & Rehabilitation Sciences, The University of Queensland, St Lucia, 4067, QLD, Brisbane, Australia; MultiLit Research Unit, MultiLit Pty Ltd, Macquarie Park, 2113, NSW, Sydney, Australia
| | - David A Copland
- School of Health & Rehabilitation Sciences, The University of Queensland, St Lucia, 4067, QLD, Brisbane, Australia
| | - Wendy L Arnott
- School of Health & Rehabilitation Sciences, The University of Queensland, St Lucia, 4067, QLD, Brisbane, Australia
| | - Wayne J Wilson
- School of Health & Rehabilitation Sciences, The University of Queensland, St Lucia, 4067, QLD, Brisbane, Australia
| | - Anthony J Angwin
- School of Health & Rehabilitation Sciences, The University of Queensland, St Lucia, 4067, QLD, Brisbane, Australia
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5
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Structural Brain Asymmetries for Language: A Comparative Approach across Primates. Symmetry (Basel) 2022. [DOI: 10.3390/sym14050876] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Humans are the only species that can speak. Nonhuman primates, however, share some ‘domain-general’ cognitive properties that are essential to language processes. Whether these shared cognitive properties between humans and nonhuman primates are the results of a continuous evolution [homologies] or of a convergent evolution [analogies] remain difficult to demonstrate. However, comparing their respective underlying structure—the brain—to determinate their similarity or their divergence across species is critical to help increase the probability of either of the two hypotheses, respectively. Key areas associated with language processes are the Planum Temporale, Broca’s Area, the Arcuate Fasciculus, Cingulate Sulcus, The Insula, Superior Temporal Sulcus, the Inferior Parietal lobe, and the Central Sulcus. These structures share a fundamental feature: They are functionally and structurally specialised to one hemisphere. Interestingly, several nonhuman primate species, such as chimpanzees and baboons, show human-like structural brain asymmetries for areas homologous to key language regions. The question then arises: for what function did these asymmetries arise in non-linguistic primates, if not for language per se? In an attempt to provide some answers, we review the literature on the lateralisation of the gestural communication system, which may represent the missing behavioural link to brain asymmetries for language area’s homologues in our common ancestor.
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6
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Romanovska L, Bonte M. How Learning to Read Changes the Listening Brain. Front Psychol 2021; 12:726882. [PMID: 34987442 PMCID: PMC8721231 DOI: 10.3389/fpsyg.2021.726882] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Accepted: 11/23/2021] [Indexed: 01/18/2023] Open
Abstract
Reading acquisition reorganizes existing brain networks for speech and visual processing to form novel audio-visual language representations. This requires substantial cortical plasticity that is reflected in changes in brain activation and functional as well as structural connectivity between brain areas. The extent to which a child's brain can accommodate these changes may underlie the high variability in reading outcome in both typical and dyslexic readers. In this review, we focus on reading-induced functional changes of the dorsal speech network in particular and discuss how its reciprocal interactions with the ventral reading network contributes to reading outcome. We discuss how the dynamic and intertwined development of both reading networks may be best captured by approaching reading from a skill learning perspective, using audio-visual learning paradigms and longitudinal designs to follow neuro-behavioral changes while children's reading skills unfold.
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Affiliation(s)
| | - Milene Bonte
- *Correspondence: Linda Romanovska, ; Milene Bonte,
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7
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Steber S, Rossi S. So young, yet so mature? Electrophysiological and vascular correlates of phonotactic processing in 18-month-olds. Dev Cogn Neurosci 2020; 43:100784. [PMID: 32510350 PMCID: PMC7184260 DOI: 10.1016/j.dcn.2020.100784] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 04/08/2020] [Accepted: 04/09/2020] [Indexed: 11/30/2022] Open
Abstract
The present study investigated neural correlates of implicit phonotactic processing in 18-month-old children that just reached an important step in language development: the vocabulary spurt. Pseudowords, either phonotactically legal or illegal with respect to their native language, were acoustically presented to monolingually German raised infants. Neural activity was simultaneously assessed by means of electroencephalography (EEG) and functional near-infrared spectroscopy (fNIRS). The former method excellently tracks fast processing mechanisms, whereas the latter reveals brain areas recruited. Results of the present study indicate that 18-month-olds recognize the linguistic properties of their native language based on phonotactics. This manifested in an increased N400 for legal compared to illegal pseudowords in the EEG conforming to adult-like mechanisms. Unfortunately, fNIRS findings did not support this discrimination ability. Possible methodological and brain maturational reasons might explain this null finding. This study provides evidence for the advantage of a multi-methodological approach in order to get a clear picture on neural language development.
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Affiliation(s)
- Sarah Steber
- ICONE - Innsbruck Cognitive Neuroscience, Department for Hearing, Speech, and Voice Disorders, Medical University of Innsbruck, 6020, Innsbruck, Austria; Department of Psychology, University of Innsbruck, 6020, Innsbruck, Austria.
| | - Sonja Rossi
- ICONE - Innsbruck Cognitive Neuroscience, Department for Hearing, Speech, and Voice Disorders, Medical University of Innsbruck, 6020, Innsbruck, Austria.
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8
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Guerin JB, Greiner HM, Mangano FT, Leach JL. Functional MRI in Children: Current Clinical Applications. Semin Pediatr Neurol 2020; 33:100800. [PMID: 32331615 DOI: 10.1016/j.spen.2020.100800] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Functional magnetic resonance imaging has become a critical research tool for evaluating brain function during active tasks and resting states. This has improved our understanding of developmental trajectories in children as well as the plasticity of neural networks in disease states. In the clinical setting, functional maps of eloquent cortex in patients with brain lesions and/or epilepsy provides crucial information for presurgical planning. Although children are inherently challenging to scan in this setting, preparing them appropriately and providing adequate resources can help achieve useful clinical data. This article will review the basic underlying physiologic aspects of functional magnetic resonance imaging, review clinically relevant research applications, describe known validation data compared to gold standard techniques and detail future directions of this technology.
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Affiliation(s)
- Julie B Guerin
- Department of Pediatric Radiology and Medical Imaging, Cincinnati Children's Hospital Medical Center, Cincinnati, OH; Department of Radiology, Mayo Clinic, Rochester, MN
| | - Hansel M Greiner
- Division of Neurology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH; Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH
| | - Francesco T Mangano
- Division of Pediatric Neurosurgery, University of Cincinnati College of Medicine Department of Neurosurgery, Cincinnati, OH
| | - James L Leach
- Department of Pediatric Radiology and Medical Imaging, Cincinnati Children's Hospital Medical Center, Cincinnati, OH; Department of Radiology, Mayo Clinic, Rochester, MN.
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9
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Qi T, Schaadt G, Cafiero R, Brauer J, Skeide MA, Friederici AD. The emergence of long-range language network structural covariance and language abilities. Neuroimage 2019; 191:36-48. [DOI: 10.1016/j.neuroimage.2019.02.014] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Revised: 01/28/2019] [Accepted: 02/05/2019] [Indexed: 01/12/2023] Open
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10
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Rejnö-Habte Selassie G, Pegenius G, Viggedal G, Hallböök T, Thordstein M. Navigated transcranial magnetic stimulation for preoperative cortical mapping of expressive language in children: Development of a method. Epilepsy Behav 2018; 87:180-187. [PMID: 30093270 DOI: 10.1016/j.yebeh.2018.05.036] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Revised: 05/20/2018] [Accepted: 05/20/2018] [Indexed: 12/16/2022]
Abstract
We adjusted an object-naming task with repetitive navigated transcranial magnetic stimulation (rnTMS) originally developed for preoperative cortical language mapping in adults in order for it to be used in children. Two series of pictures were chosen for children above and below 10 years of age, respectively. Firstly, the series of pictures and the preferred speed of presentation were assessed for their applicability in children of different ages and abilities. Secondly, these series were used with rnTMS preoperatively in five children with epilepsy. Naming errors induced by the stimulation comprised no response, delayed response, semantic error, phonological error, and self-correction. Language laterality was compared with the results of a dichotic listening test and with neuropsychological tests with respect to general laterality, and general language abilities were considered with respect to the results of stimulation. One participant had below normal general language abilities, two had below-normal rapid naming, and three had slow and indistinct articulation. Laterality was only clear in two of the participants. All children required breaks of various durations during the process, and individual adjustments of the interpicture interval and other stimulation parameters were also made. We conclude that, after adjustment, rnTMS combined with an object-naming task can be useful for preoperative language mapping in children.
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Affiliation(s)
| | - Göran Pegenius
- Unit of Clinical Neurophysiology, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Gerd Viggedal
- Department of Pediatrics, Queen Silvia Children's Hospital and Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Tove Hallböök
- Department of Pediatrics, Queen Silvia Children's Hospital and Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Magnus Thordstein
- Unit of Clinical Neurophysiology, Sahlgrenska University Hospital, Gothenburg, Sweden
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11
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Xiao Y, Brauer J, Lauckner M, Zhai H, Jia F, Margulies DS, Friederici AD. Development of the Intrinsic Language Network in Preschool Children from Ages 3 to 5 Years. PLoS One 2016; 11:e0165802. [PMID: 27812160 PMCID: PMC5094780 DOI: 10.1371/journal.pone.0165802] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Accepted: 10/18/2016] [Indexed: 01/21/2023] Open
Abstract
Resting state studies of spontaneous fluctuations in the functional magnetic resonance imaging (fMRI) blood oxygen level dependent signal have shown great potential in mapping the intrinsic functional connectivity of the human brain underlying cognitive functions. The aim of the present study was to explore the developmental changes in functional networks of the developing human brain exemplified with the language network in typically developing preschool children. To this end, resting-sate fMRI data were obtained from native Chinese children at ages of 3 and 5 years, 15 in each age group. Resting-state functional connectivity (RSFC) was analyzed for four regions of interest; these are the left and right anterior superior temporal gyrus (aSTG), left posterior superior temporal gyrus (pSTG), and left inferior frontal gyrus (IFG). The comparison of these RSFC maps between 3- and 5-year-olds revealed that RSFC decreases in the right aSTG and increases in the left hemisphere between aSTG seed and IFG, between pSTG seed and IFG, as well as between IFG seed and posterior superior temporal sulcus. In a subsequent analysis, functional asymmetry of the language network seeding in aSTG, pSTG and IFG was further investigated. The results showed an increase of left lateralization in both RSFC of pSTG and of IFG from ages 3 to 5 years. The IFG showed a leftward lateralized trend in 3-year-olds, while pSTG demonstrated rightward asymmetry in 5-year-olds. These findings suggest clear developmental trajectories of the language network between 3- and 5-year-olds revealed as a function of age, characterized by increasing long-range connections and dynamic hemispheric lateralization with age. Our study provides new insights into the developmental changes of a well-established functional network in young children and also offers a basis for future cross-culture and cross-age studies of the resting-state language network.
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Affiliation(s)
- Yaqiong Xiao
- Max Planck Institute for Human Cognitive and Brain Sciences, Department of Neuropsychology, Leipzig, Germany
- * E-mail: (YQX); (HCZ)
| | - Jens Brauer
- Max Planck Institute for Human Cognitive and Brain Sciences, Department of Neuropsychology, Leipzig, Germany
| | - Mark Lauckner
- Max Planck Research Group for Neuroanatomy & Connectivity, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany
| | - Hongchang Zhai
- College of Education, Guangzhou University, Guangzhou, R.P. China
- * E-mail: (YQX); (HCZ)
| | - Fucang Jia
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, R.P. China
| | - Daniel S. Margulies
- Max Planck Research Group for Neuroanatomy & Connectivity, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany
| | - Angela D. Friederici
- Max Planck Institute for Human Cognitive and Brain Sciences, Department of Neuropsychology, Leipzig, Germany
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12
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Longitudinal changes in resting-state fMRI from age 5 to age 6years covary with language development. Neuroimage 2015; 128:116-124. [PMID: 26690809 PMCID: PMC4767215 DOI: 10.1016/j.neuroimage.2015.12.008] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Revised: 10/30/2015] [Accepted: 12/06/2015] [Indexed: 01/01/2023] Open
Abstract
Resting-state functional magnetic resonance imaging is a powerful technique to study the whole-brain neural connectivity that underlies cognitive systems. The present study aimed to define the changes in neural connectivity in their relation to language development. Longitudinal resting-state functional data were acquired from a cohort of preschool children at age 5 and one year later, and changes in functional connectivity were correlated with language performance in sentence comprehension. For this, degree centrality, a voxel-based network measure, was used to assess age-related differences in connectivity at the whole-brain level. Increases in connectivity with age were found selectively in a cluster within the left posterior superior temporal gyrus and sulcus (STG/STS). In order to further specify the connection changes, a secondary seed-based functional connectivity analysis on this very cluster was performed. The correlations between resting-state functional connectivity (RSFC) and language performance revealed developmental effects with age and, importantly, also dependent on the advancement in sentence comprehension ability over time. In children with greater advancement in language abilities, the behavioral improvement was positively correlated with RSFC increase between left posterior STG/STS and other regions of the language network, i.e., left and right inferior frontal cortex. The age-related changes observed in this study provide evidence for alterations in the language network as language develops and demonstrates the viability of this approach for the investigation of normal and aberrant language development.
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13
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Xiao Y, Friederici AD, Margulies DS, Brauer J. Development of a selective left-hemispheric fronto-temporal network for processing syntactic complexity in language comprehension. Neuropsychologia 2015; 83:274-282. [PMID: 26352468 PMCID: PMC4780430 DOI: 10.1016/j.neuropsychologia.2015.09.003] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Revised: 08/21/2015] [Accepted: 09/02/2015] [Indexed: 01/11/2023]
Abstract
The development of language comprehension abilities in childhood is closely related to the maturation of the brain, especially the ability to process syntactically complex sentences. Recent studies proposed that the fronto-temporal connection within left perisylvian regions, supporting the processing of syntactically complex sentences, is still immature at preschool age. In the current study, resting state functional magnetic resonance imaging data were acquired from typically developing 5-year-old children and adults to shed further light on the brain functional development. Children additionally performed a behavioral syntactic comprehension test outside the scanner. The amplitude of low-frequency fluctuations was analyzed in order to identify the functional correlation networks of language-relevant brain regions. Results showed an intrahemispheric correlation between left inferior frontal gyrus (IFG) and left posterior superior temporal sulcus (pSTS) in adults, whereas an interhemispheric correlation between left IFG and its right-hemispheric homolog was predominant in children. Correlation analysis between resting-state functional connectivity and sentence processing performance in 5-year-olds revealed that local connectivity within the left IFG is associated with competence of processing syntactically simple canonical sentences, while long-range connectivity between IFG and pSTS in left hemisphere is associated with competence of processing syntactically relatively more complex non-canonical sentences. The present developmental data suggest that a selective left fronto-temporal connectivity network for processing complex syntax is already in functional connection at the age of 5 years when measured in a non-task situation. The correlational findings provide new insight into the relationship between intrinsic functional connectivity and syntactic language abilities in preschool children. resting state ALFF correlated in adults between left IFG and left pSTS. resting state ALFF correlated in children between left IFG and right homolog area. intrahemispheric connectivity co-varies with syntactic processing skills in children.
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Affiliation(s)
- Yaqiong Xiao
- Department of Neuropsychology, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany
| | - Angela D Friederici
- Department of Neuropsychology, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany
| | - Daniel S Margulies
- Max Planck Research Group for Neuroanatomy & Connectivity, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany
| | - Jens Brauer
- Department of Neuropsychology, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany.
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14
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Jeon HA, Friederici AD. Degree of automaticity and the prefrontal cortex. Trends Cogn Sci 2015; 19:244-50. [PMID: 25843542 DOI: 10.1016/j.tics.2015.03.003] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2015] [Revised: 02/27/2015] [Accepted: 03/06/2015] [Indexed: 10/23/2022]
Abstract
The dorsolateral prefrontal cortex (PFC), with more anterior areas [Brodmann area (BA) 45, 47, and 10], has been known to be activated as cognitive hierarchy increases. However, this does not hold for highly automatic processes such as first language (L1), where the posterior region (BA 44) is known as the key area for the processing of complex linguistic hierarchy. Discussing this disparity, we propose that the degree of automaticity (DoA) is a crucial factor for the framework of functional mapping in the PFC: the posterior-to-anterior gradient system for more controlled processes and the posterior-confined system for automatic processes. We support this view with previous findings and provide a new perspective on the functional organization of the PFC.
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Affiliation(s)
- Hyeon-Ae Jeon
- Max Planck Institute for Human Cognitive and Brain Sciences, Department of Neuropsychology, Leipzig, Germany.
| | - Angela D Friederici
- Max Planck Institute for Human Cognitive and Brain Sciences, Department of Neuropsychology, Leipzig, Germany
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15
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Hertz-Pannier L, Noulhiane M, Rodrigo S, Chiron C. Pretherapeutic functional magnetic resonance imaging in children. Neuroimaging Clin N Am 2014; 24:639-53. [PMID: 25441505 DOI: 10.1016/j.nic.2014.07.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
In this article, some specificities of functional magnetic resonance imaging (fMRI) in children (eg, blood-oxygen-level-dependent response and brain maturation, paradigm design, technical issues, feasibility, data analysis) are reviewed, the main knowledge on presurgical cortical mapping in children (motor, language, reading, memory) is summarized, and the emergence of resting state fMRI in presurgical cortical mapping is discussed.
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Affiliation(s)
- Lucie Hertz-Pannier
- UMR 1129, INSERM, Paris Descartes University, CEA-Saclay, Gif sur Yvette, France; UNIACT/Neurospin, I2BM, DSV, CEA-Saclay, Gif sur Yvette, France.
| | - Marion Noulhiane
- UMR 1129, INSERM, Paris Descartes University, CEA-Saclay, Gif sur Yvette, France; UNIACT/Neurospin, I2BM, DSV, CEA-Saclay, Gif sur Yvette, France
| | - Sebastian Rodrigo
- UMR 1129, INSERM, Paris Descartes University, CEA-Saclay, Gif sur Yvette, France; UNIACT/Neurospin, I2BM, DSV, CEA-Saclay, Gif sur Yvette, France
| | - Catherine Chiron
- UMR 1129, INSERM, Paris Descartes University, CEA-Saclay, Gif sur Yvette, France; UNIACT/Neurospin, I2BM, DSV, CEA-Saclay, Gif sur Yvette, France
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16
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Baldoli C, Scola E, Della Rosa PA, Pontesilli S, Longaretti R, Poloniato A, Scotti R, Blasi V, Cirillo S, Iadanza A, Rovelli R, Barera G, Scifo P. Maturation of preterm newborn brains: a fMRI–DTI study of auditory processing of linguistic stimuli and white matter development. Brain Struct Funct 2014; 220:3733-51. [DOI: 10.1007/s00429-014-0887-5] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Accepted: 09/08/2014] [Indexed: 11/30/2022]
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17
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Vector-based phase classification of initial dips during word listening using near-infrared spectroscopy. Neuroreport 2013; 23:947-51. [PMID: 22989928 DOI: 10.1097/wnr.0b013e328359833b] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
This study examined the classification of initial dips during passive listening to single words by analysis of vectors of deoxyHb and oxyHb measurements simultaneously derived from near-infrared spectroscopy. The initial dip response during a single-word 1.5-s task in 13 healthy participants was significant only in the language area, which includes the left posterior superior temporal gyrus and angular gyrus. Event-related vectors of responses to comprehended words moved significantly into phase 4, a dip phase, whereas vectors of responses to unknown words moved into a nondip phase (P<0.05). The same results were reproduced after previously unknown words were learnt by the participants. Among the five dip phases, reflecting variations in transient oxygen metabolic regulation during a task, the frequency of occurrence of hypoxic-ischemic initial dips (decreased oxyHb) was around three times that of the canonical dip (increased deoxyHb and oxyHb). Phase classification of event-related vectors enhances the slight amount of oxygen exchange that occurs in word recognition, which has been difficult to detect because of its small amplitude.
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18
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Addis L, Lin JJ, Pal DK, Hermann B, Caplan R. Imaging and genetics of language and cognition in pediatric epilepsy. Epilepsy Behav 2013; 26:303-12. [PMID: 23116771 PMCID: PMC3732317 DOI: 10.1016/j.yebeh.2012.09.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Accepted: 09/12/2012] [Indexed: 12/19/2022]
Abstract
This paper presents translational aspects of imaging and genetic studies of language and cognition in children with epilepsy of average intelligence. It also discusses current unanswered translational questions in each of these research areas. A brief review of multimodal imaging and language study findings shows that abnormal structure and function, as well as plasticity and reorganization in language-related cortical regions, are found both in children with epilepsy with normal language skills and in those with linguistic deficits. The review on cognition highlights that multiple domains of impaired cognition and abnormalities in brain structure and/or connectivity are evident early on in childhood epilepsy and might be specific for epilepsy syndrome. The description of state-of-the-art genetic analyses that can be used to explain the convergence of language impairment and Rolandic epilepsy includes a discussion of the methodological difficulties involved in these analyses. Two junior researchers describe how their current and planned studies address some of the unanswered translational questions regarding cognition and imaging and the genetic analysis of speech sound disorder, reading, and centrotemporal spikes in Rolandic epilepsy.
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Affiliation(s)
- Laura Addis
- Institute of Psychiatry, University of London, London, UK
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19
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Berl MM, Mayo J, Parks EN, Rosenberger LR, VanMeter J, Ratner NB, Vaidya CJ, Gaillard WD. Regional differences in the developmental trajectory of lateralization of the language network. Hum Brain Mapp 2012; 35:270-84. [PMID: 23033058 DOI: 10.1002/hbm.22179] [Citation(s) in RCA: 77] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2012] [Revised: 06/23/2012] [Accepted: 07/12/2012] [Indexed: 11/05/2022] Open
Abstract
The timing and developmental factors underlying the establishment of language dominance are poorly understood. We investigated the degree of lateralization of traditional frontotemporal and modulatory prefrontal-cerebellar regions of the distributed language network in children (n = 57) ages 4 to 12--a critical period for language consolidation. We examined the relationship between the strength of language lateralization and neuropsychological measures and task performance. The fundamental language network is established by four with ongoing maturation of language functions as evidenced by strengthening of lateralization in the traditional frontotemporal language regions; temporal regions were strongly and consistently lateralized by age seven, while frontal regions had greater variability and were less strongly lateralized through age 10. In contrast, the modulatory prefrontal-cerebellar regions were the least strongly lateralized and degree of lateralization was not associated with age. Stronger core language skills were significantly correlated with greater right lateralization in the cerebellum.
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Affiliation(s)
- Madison M Berl
- Department of Neurosciences, Children's National Medical Center, Washington, DC
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20
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Knuepffer C, Murdoch BE, Lloyd D, Lewis FM, Hinchliffe FJ. Reduced N400 semantic priming effects in adult survivors of paediatric and adolescent traumatic brain injury. BRAIN AND LANGUAGE 2012; 123:52-63. [PMID: 22819620 DOI: 10.1016/j.bandl.2012.06.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2011] [Revised: 05/05/2012] [Accepted: 06/24/2012] [Indexed: 06/01/2023]
Abstract
The immediate and long-term neural correlates of linguistic processing deficits reported following paediatric and adolescent traumatic brain injury (TBI) are poorly understood. Therefore, the current research investigated event-related potentials (ERPs) elicited during a semantic picture-word priming experiment in two groups of highly functioning individuals matched for various demographic variables and behavioural language performance. Participants in the TBI group had a recorded history of paediatric or adolescent TBI involving injury mechanisms associated with diffuse white matter pathology, while participants in the control group never sustained any insult to the brain. A comparison of N400 Mean Amplitudes elicited during three experimental conditions with varying semantic relatedness between the prime and target stimuli (congruent, semantically related, unrelated) revealed a significantly smaller N400 response in the unrelated condition in the TBI group, indicating residual linguistic processing deviations when processing demands required the quick detection of a between-category (unrelated) violation of semantic expectancy.
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Affiliation(s)
- C Knuepffer
- Centre for Neurogenic Communication Disorders Research, The University of Queensland, Brisbane, Australia.
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21
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Brennan C, Cao F, Pedroarena-Leal N, McNorgan C, Booth JR. Reading acquisition reorganizes the phonological awareness network only in alphabetic writing systems. Hum Brain Mapp 2012; 34:3354-68. [PMID: 22815229 DOI: 10.1002/hbm.22147] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2011] [Revised: 05/23/2012] [Accepted: 05/24/2012] [Indexed: 11/11/2022] Open
Abstract
It is unknown how experience with different types of orthographies influences the neural basis of oral language processing. In order to determine the effects of alphabetic and nonalphabetic writing systems, the current study examined the influence of learning to read on oral language in English and Chinese speakers. Children (8-12 years olds) and adults made rhyming judgments to pairs of spoken words during functional magnetic resonance imaging (fMRI). Developmental increases were seen only for English speakers in the left hemisphere phonological network (superior temporal gyrus (STG), inferior parietal lobule, and inferior frontal gyrus). The increase in the STG was more pronounced for words with conflicting orthography (e.g. pint-mint; jazz-has) even though access to orthography was irrelevant to the task. Moreover, higher reading skill was correlated with greater activation in the STG only for English speaking children. The effects suggest that learning to read reorganizes the phonological awareness network only for alphabetic and not logographic writing systems because of differences in the principles for mapping between orthographic and phonological representations. The reorganization of the auditory cortex may result in better phonological awareness skills in alphabetic readers.
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Affiliation(s)
- Christine Brennan
- Department of Communication Sciences and Disorders, Northwestern University, Evanston, Illinois
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22
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Vagharchakian L, Dehaene-Lambertz G, Pallier C, Dehaene S. A temporal bottleneck in the language comprehension network. J Neurosci 2012; 32:9089-102. [PMID: 22745508 PMCID: PMC6622343 DOI: 10.1523/jneurosci.5685-11.2012] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2011] [Revised: 03/20/2012] [Accepted: 04/17/2012] [Indexed: 11/21/2022] Open
Abstract
Humans can understand spoken or written sentences presented at extremely fast rates of ∼400 wpm, far exceeding the normal speech rate (∼150 wpm). How does the brain cope with speeded language? And what processing bottlenecks eventually make language incomprehensible above a certain presentation rate? We used time-resolved fMRI to probe the brain responses to spoken and written sentences presented at five compression rates, ranging from intelligible (60-100% of the natural duration) to challenging (40%) and unintelligible (20%). The results show that cortical areas differ sharply in their activation speed and amplitude. In modality-specific sensory areas, activation varies linearly with stimulus duration. However, a large modality-independent left-hemispheric language network, including the inferior frontal gyrus (pars orbitalis and triangularis) and the superior temporal sulcus, shows a remarkably time-invariant response, followed by a sudden collapse for unintelligible stimuli. Finally, linear and nonlinear responses, reflecting a greater effort as compression increases, are seen at various prefrontal and parietal sites. We show that these profiles fit with a simple model according to which the higher stages of language processing operate at a fixed speed and thus impose a temporal bottleneck on sentence comprehension. At presentation rates faster than this internal processing speed, incoming words must be buffered, and intelligibility vanishes when buffer storage and retrieval operations are saturated. Based on their temporal and amplitude profiles, buffer regions can be identified with the left inferior frontal/anterior insula, precentral cortex, and mesial frontal cortex.
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Affiliation(s)
- Laurianne Vagharchakian
- Institut National de la Santé et de la Recherche Médicale, Cognitive Neuroimaging Unit, F91191 Gif-sur-Yvette, France
- Commissariat à L'Énergie Atomique et aux Énergies Alternatives, NeuroSpin Center, F91191 Gif-sur-Yvette, France
- Université Paris XI, 91405 Orsay, France, and
| | - Ghislaine Dehaene-Lambertz
- Institut National de la Santé et de la Recherche Médicale, Cognitive Neuroimaging Unit, F91191 Gif-sur-Yvette, France
- Commissariat à L'Énergie Atomique et aux Énergies Alternatives, NeuroSpin Center, F91191 Gif-sur-Yvette, France
- Université Paris XI, 91405 Orsay, France, and
| | - Christophe Pallier
- Institut National de la Santé et de la Recherche Médicale, Cognitive Neuroimaging Unit, F91191 Gif-sur-Yvette, France
- Commissariat à L'Énergie Atomique et aux Énergies Alternatives, NeuroSpin Center, F91191 Gif-sur-Yvette, France
- Université Paris XI, 91405 Orsay, France, and
| | - Stanislas Dehaene
- Institut National de la Santé et de la Recherche Médicale, Cognitive Neuroimaging Unit, F91191 Gif-sur-Yvette, France
- Commissariat à L'Énergie Atomique et aux Énergies Alternatives, NeuroSpin Center, F91191 Gif-sur-Yvette, France
- Université Paris XI, 91405 Orsay, France, and
- Collège de France, 75231 Paris, France
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Abstract
The ability to learn language is a human trait. In adults and children, brain imaging studies have shown that auditory language activates a bilateral frontotemporal network with a left hemispheric dominance. It is an open question whether these activations represent the complete neural basis for language present at birth. Here we demonstrate that in 2-d-old infants, the language-related neural substrate is fully active in both hemispheres with a preponderance in the right auditory cortex. Functional and structural connectivities within this neural network, however, are immature, with strong connectivities only between the two hemispheres, contrasting with the adult pattern of prevalent intrahemispheric connectivities. Thus, although the brain responds to spoken language already at birth, thereby providing a strong biological basis to acquire language, progressive maturation of intrahemispheric functional connectivity is yet to be established with language exposure as the brain develops.
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24
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Friederici AD, Brauer J, Lohmann G. Maturation of the language network: from inter- to intrahemispheric connectivities. PLoS One 2011; 6:e20726. [PMID: 21695183 PMCID: PMC3113799 DOI: 10.1371/journal.pone.0020726] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2010] [Accepted: 05/10/2011] [Indexed: 11/30/2022] Open
Abstract
Language development must go hand-in-hand with brain maturation. Little is known about how the brain develops to serve language processing, in particular, the processing of complex syntax, a capacity unique to humans. Behavioral reports indicate that the ability to process complex syntax is not yet adult-like by the age of seven years. Here, we apply a novel method to demonstrate that the basic neural basis of language, as revealed by low frequency fluctuation stemming from functional MRI data, differs between six-year-old children and adults in crucial aspects. Although the classical language regions are actively in place by the age of six, the functional connectivity between these regions clearly is not. In contrast to adults who show strong connectivities between frontal and temporal language regions within the left hemisphere, children's default language network is characterized by a strong functional interhemispheric connectivity, mainly between the superior temporal regions. These data indicate a functional reorganization of the neural network underlying language development towards a system that allows a close interplay between frontal and temporal regions within the left hemisphere.
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Affiliation(s)
- Angela D Friederici
- Department of Neuropsychology, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany.
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25
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The physiology of developmental changes in BOLD functional imaging signals. Dev Cogn Neurosci 2011; 1:199-216. [PMID: 22436508 DOI: 10.1016/j.dcn.2011.04.001] [Citation(s) in RCA: 112] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2011] [Revised: 04/18/2011] [Accepted: 04/19/2011] [Indexed: 12/14/2022] Open
Abstract
BOLD fMRI (blood oxygenation level dependent functional magnetic resonance imaging) is increasingly used to detect developmental changes of human brain function that are hypothesized to underlie the maturation of cognitive processes. BOLD signals depend on neuronal activity increasing cerebral blood flow, and are reduced by neural oxygen consumption. Thus, developmental changes of BOLD signals may not reflect altered information processing if there are concomitant changes in neurovascular coupling (the mechanism by which neuronal activity increases blood flow) or neural energy use (and hence oxygen consumption). We review how BOLD signals are generated, and explain the signalling pathways which convert neuronal activity into increased blood flow. We then summarize in broad terms the developmental changes that the brain's neural circuitry undergoes during growth from childhood through adolescence to adulthood, and present the changes in neurovascular coupling mechanisms and energy use which occur over the same period. This information provides a framework for assessing whether the BOLD changes observed during human development reflect altered cognitive processing or changes in neurovascular coupling and energy use.
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26
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Hoehl S, Brauer J, Brasse G, Striano T, Friederici AD. Children's processing of emotions expressed by peers and adults: An fMRI study. Soc Neurosci 2010; 5:543-59. [DOI: 10.1080/17470911003708206] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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27
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Cao F, Khalid K, Lee R, Brennan C, Yang Y, Li K, Bolger DJ, Booth JR. Development of brain networks involved in spoken word processing of Mandarin Chinese. Neuroimage 2010; 57:750-9. [PMID: 20884355 DOI: 10.1016/j.neuroimage.2010.09.047] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2010] [Revised: 09/16/2010] [Accepted: 09/18/2010] [Indexed: 11/15/2022] Open
Abstract
Developmental differences in phonological and orthographic processing of Chinese spoken words were examined in 9-year-olds, 11-year-olds and adults using functional magnetic resonance imaging (fMRI). Rhyming and spelling judgments were made to two-character words presented sequentially in the auditory modality. Developmental comparisons between adults and both groups of children combined showed that age-related changes in activation in visuo-orthographic regions depended on a task. There were developmental increases in the left inferior temporal gyrus and the right inferior occipital gyrus in the spelling task, suggesting more extensive visuo-orthographic processing in a task that required access to these representations. Conversely, there were developmental decreases in activation in the left fusiform gyrus and left middle occipital gyrus in the rhyming task, suggesting that the development of reading is marked by reduced involvement of orthography in a spoken language task that does not require access to these orthographic representations. Developmental decreases may arise from the existence of extensive homophony (auditory words that have multiple spellings) in Chinese. In addition, we found that 11-year-olds and adults showed similar activation in the left superior temporal gyrus across tasks, with both groups showing greater activation than 9-year-olds. This pattern suggests early development of perceptual representations of phonology. In contrast, 11-year-olds and 9-year-olds showed similar activation in the left inferior frontal gyrus across tasks, with both groups showing weaker activation than adults. This pattern suggests late development of controlled retrieval and selection of lexical representations. Altogether, this study suggests differential effects of character acquisition on development of components of the language network in Chinese as compared to previous reports on alphabetic languages.
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Affiliation(s)
- Fan Cao
- Department of Communication Sciences and Disorders, Northwestern University, 2240 Campus Drive, Evanston, IL 60208, USA.
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28
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Bidirectional connectivity between hemispheres occurs at multiple levels in language processing but depends on sex. J Neurosci 2010; 30:11576-85. [PMID: 20810879 DOI: 10.1523/jneurosci.1245-10.2010] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Our aim was to determine the direction of interhemispheric communication in a phonological task in regions involved in different levels of processing. Effective connectivity analysis was conducted on functional magnetic resonance imaging data from 39 children (ages 9-15 years) performing rhyming judgment on spoken words. The results show interaction between hemispheres at multiple levels. First, there is unidirectional transfer of information from right to left at the sensory level of primary auditory cortex. Second, bidirectional connections between superior temporal gyri (STGs) suggest a reciprocal cooperation between hemispheres at the level of phonological and prosodic processing. Third, a direct connection from right STG to left inferior frontal gyrus suggest that information processed in the right STG is integrated into the final stages of phonological segmentation required for the rhyming decision. Intrahemispheric connectivity from primary auditory cortex to STG was stronger in the left compared to the right hemisphere. These results support a model of cooperation between hemispheres, with asymmetric interhemispheric and intrahemispheric connectivity consistent with the left hemisphere specialization for phonological processing. Finally, we found greater interhemispheric connectivity in girls compared to boys, consistent with the hypothesis of a more bilateral representation of language in females than males. However, interhemispheric communication was associated with slow performance and low verbal intelligent quotient within girls. We suggest that females may have the potential for greater interhemispheric cooperation, which may be an advantage in certain tasks. However, in other tasks too much communication between hemispheres may interfere with task performance.
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29
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Brauer J, Anwander A, Friederici AD. Neuroanatomical Prerequisites for Language Functions in the Maturing Brain. Cereb Cortex 2010; 21:459-66. [PMID: 20566580 DOI: 10.1093/cercor/bhq108] [Citation(s) in RCA: 165] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Jens Brauer
- Max Planck Institute for Human Cognitive and Brain Sciences, Department of Neuropsychology, 04103 Leipzig, Germany.
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30
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Ross ED. Cerebral localization of functions and the neurology of language: fact versus fiction or is it something else? Neuroscientist 2010; 16:222-43. [PMID: 20139334 DOI: 10.1177/1073858409349899] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Over the last 15 years there has been a burgeoning number of publications using functional brain imaging (>40,000 articles based on an ISI/Web of Science search) to localize behavioral and cognitive processes to specific areas in the human brain that are often not confirmed by traditional, lesion-based studies. Thus, there is a need to reassess what cerebral localization of functions is and is not. Otherwise, there is no rational way to interpret the escalating claims of localization in the functional imaging literature that is taking on the appearance of neurophysiologic "phrenology". This article will present arguments to suggest that functional localization in the brain is a robust but very dynamic, four-dimensional process. It is a learned phenomenon driven over time by large-scale, spatially distributed, neural networks seeking to efficiently maximize the processing, storage, and manipulation of information for cognitive and behavioral operations. Because of historical considerations and space limitations, the main focus will be on localization of language-related functions whose theoretical neurological basis can be generalized for any complex cognitive-behavioral function.
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Affiliation(s)
- Elliott D Ross
- Department of Neurology, University of Oklahoma Health Sciences Center and the VA Medical Center, Oklahoma City, Oklahoma, USA.
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31
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Functional MRI in children: clinical and research applications. Pediatr Radiol 2010; 40:31-49. [PMID: 19937236 DOI: 10.1007/s00247-009-1452-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2009] [Revised: 09/29/2009] [Accepted: 10/19/2009] [Indexed: 10/20/2022]
Abstract
Functional MRI has become a critical research tool for evaluating brain function and developmental trajectories in children. Its clinical use in children is becoming more common. This presentation will review the basic underlying physiologic and technical aspects of fMRI, review research applications that have direct clinical relevance, and outline the current clinical uses of this technology.
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32
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Vannest J, Karunanayaka PR, Schmithorst VJ, Szaflarski JP, Holland SK. Language networks in children: evidence from functional MRI studies. AJR Am J Roentgenol 2009; 192:1190-6. [PMID: 19380541 PMCID: PMC2791163 DOI: 10.2214/ajr.08.2246] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
OBJECTIVE The purpose of our study was to review functional MRI and other neuroimaging studies of language skills in children from infancy to adulthood. CONCLUSION Functional MRI (fMRI) and other neuroimaging studies show developmental changes in the networks of brain regions supporting language, which can be affected by brain injuries or neurologic disorders. Particular aspects of language rely on networks that lateralize to the dominant hemisphere; others rely on bilateral or nondominant mechanisms. Multiple fMRI tasks for pediatric patients characterize functional brain reorganization that may accompany language deficits.
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Affiliation(s)
- Jennifer Vannest
- Pediatric Neuroimaging Research Consortium, Cincinnati Children's Hospital Research Foundation and Cincinnati Children's Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH 45229-5033, USA.
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33
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Friederici AD. Pathways to language: fiber tracts in the human brain. Trends Cogn Sci 2009; 13:175-81. [PMID: 19223226 DOI: 10.1016/j.tics.2009.01.001] [Citation(s) in RCA: 336] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2008] [Revised: 01/16/2009] [Accepted: 01/16/2009] [Indexed: 10/21/2022]
Abstract
The human language function is not only based on the grey matter of circumscribed brain regions in the frontal and the temporal cortex but moreover on the white matter fiber tracts connecting these regions. Different pathways connecting frontal and temporal cortex have been identified. The dorsal pathway projecting from the posterior portion of Broca's area to the superior temporal region seems to be of particular importance for higher-order language functions. This pathway is particularly weak in non-human compared to human primates and in children compared to adults. It is therefore considered to be crucial for the evolution of human language, which is characterized by the ability to process syntactically complex sentences.
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Affiliation(s)
- Angela D Friederici
- Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig 04103, Germany.
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