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Sullivan KA, Guo F, Klauer SG. Effects of executive load on crashes and near-crashes for young versus older drivers. ACCIDENT; ANALYSIS AND PREVENTION 2024; 201:107539. [PMID: 38608508 DOI: 10.1016/j.aap.2024.107539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 06/15/2023] [Accepted: 03/03/2024] [Indexed: 04/14/2024]
Abstract
With the increasing use of infotainment systems in vehicles, secondary tasks requiring executive demand may increase crash risk, especially for young drivers. Naturalistic driving data were examined to determine if secondary tasks with increasing executive demand would result in increasing crash risk. Data were extracted from the Second Strategic Highway Research Program Naturalistic Driving Study, where vehicles were instrumented to record driving behavior and crash/near-crash data. executive and visual-manual tasks paired with a second executive task (also referred to as dual executive tasks) were compared to the executive and visual-manual tasks performed alone. Crash/near-crash odds ratios were computed by comparing each task condition to driving without the presence of any secondary task. Dual executive tasks resulted in greater odds ratios than those for single executive tasks. The dual visual-manual task odds ratios did not increase from single task odds ratios. These effects were only found in young drivers. The study shows that dual executive secondary task load increases crash/near-crash risk in dual task situations for young drivers. Future research should be conducted to minimize task load associated with vehicle infotainment systems that use such technologies as voice commands.
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Affiliation(s)
- Keith A Sullivan
- Grado Department of Industrial and Systems Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA.
| | - Feng Guo
- Virginia Tech Transportation Insitute, 3500 Transportation Research Plaza, Blacksburg, VA, USA; Department of Statistics, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA
| | - Sheila G Klauer
- Grado Department of Industrial and Systems Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA; Virginia Tech Transportation Insitute, 3500 Transportation Research Plaza, Blacksburg, VA, USA
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2
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Lee A, Shah S, Atha K, Indoe P, Mahmoud N, Niblett G, Pradhan V, Roberts N, Malouf RS, Topiwala A. Brain health measurement: a scoping review. BMJ Open 2024; 14:e080334. [PMID: 38341202 PMCID: PMC10862273 DOI: 10.1136/bmjopen-2023-080334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Accepted: 01/23/2024] [Indexed: 02/12/2024] Open
Abstract
OBJECTIVES Preservation of brain health is an urgent priority for the world's ageing population. The evidence base for brain health optimisation strategies is rapidly expanding, but clear recommendations have been limited by heterogeneity in measurement of brain health outcomes. We performed a scoping review to systematically evaluate brain health measurement in the scientific literature to date, informing development of a core outcome set. DESIGN Scoping review. DATA SOURCES Medline, APA PsycArticles and Embase were searched through until 25 January 2023. ELIGIBILITY CRITERIA FOR SELECTING STUDIES Studies were included if they described brain health evaluation methods in sufficient detail in human adults and were in English language. DATA EXTRACTION AND SYNTHESIS Two reviewers independently screened titles, abstracts and full texts for inclusion and extracted data using Covidence software. RESULTS From 6987 articles identified by the search, 727 studies met inclusion criteria. Study publication increased by 22 times in the last decade. Cohort study was the most common study design (n=609, 84%). 479 unique methods of measuring brain health were identified, comprising imaging, cognitive, mental health, biological and clinical categories. Seven of the top 10 most frequently used brain health measurement methods were imaging based, including structural imaging of grey matter and hippocampal volumes and white matter hyperintensities. Cognitive tests such as the trail making test accounted for 286 (59.7%) of all brain health measurement methods. CONCLUSIONS The scientific literature surrounding brain health has increased exponentially, yet measurement methods are highly heterogeneous across studies which may explain the lack of clinical translation. Future studies should aim to develop a selected group of measures that should be included in all brain health studies to aid interstudy comparison (core outcome set), and broaden from the current focus on neuroimaging outcomes to include a range of outcomes.
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Affiliation(s)
- Angeline Lee
- Nuffield Department of Population Health, University of Oxford, Oxford, UK
| | | | | | - Peter Indoe
- Health Education Thames Valley (HETV), Oxford, UK
| | | | - Guy Niblett
- Health Education Thames Valley (HETV), Oxford, UK
| | | | - Nia Roberts
- Bodleian Health Care Libraries, University of Oxford, Oxford, UK
| | - Reem Saleem Malouf
- Nuffield Department of Population Health, National Perinatal Epidemiology Unit, Oxford, UK
| | - Anya Topiwala
- Nuffield Department of Population Health, University of Oxford, Oxford, UK
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Chirokoff V, Dupuy M, Abdallah M, Fatseas M, Serre F, Auriacombe M, Misdrahi D, Berthoz S, Swendsen J, Sullivan EV, Chanraud S. Craving dynamics and related cerebral substrates predict timing of use in alcohol, tobacco, and cannabis use disorders. ADDICTION NEUROSCIENCE 2023; 9:100138. [PMID: 38389954 PMCID: PMC10883348 DOI: 10.1016/j.addicn.2023.100138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/24/2024]
Abstract
Background Patients treated for Substance Use Disorders exhibit highly fluctuating patterns of craving that could reveal novel prognostic markers of use. Accordingly, we 1) measured fluctuations within intensively repeated measures of craving and 2) linked fluctuations of craving to connectivity indices within resting-state (rs) brain regions to assess their relation to use among patients undergoing treatment for Alcohol, Tobacco and Cannabis Use Disorders. Method Participants -64 individuals with SUD for tobacco, alcohol, or cannabis and 35 healthy controls-completed a week of Ecological Momentary Assessment (EMA) during which they reported craving intensity and substance use five times daily. Before EMA, a subsample of 50 patients, and 34 healthy controls also completed resting-state (rs)-MRI acquisitions. Craving temporal dynamics within each day were characterized using Standard Deviation (SD), Auto-Correlation Factor (ACF), and Mean Successive Square Difference (MSSD). Absolute Difference (AD) in craving between assessments was a prospective prediction measure. Results Within-day, higher MSSD predicted greater substance use while controlling for mean craving. Prospectively higher AD predicted later increased substance use independently of previous use or craving level. Moreover, MSSD was linked to strength in five functional neural connections, most involving frontotemporal systems. Cerebello-thalamic and thalamo-frontal connectivity were also linked to substance use and distinguished the SUD from the controls. Conclusion To the best of our knowledge, this is the first study to indicate that instability in craving may be a trigger for use in several SUD types, beyond the known effect of craving intensity.
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Affiliation(s)
- Valentine Chirokoff
- University of Bordeaux, CNRS-UMR 5287 - Institut de Neurosciences Cognitives et Intégratives d'Aquitaine (INCIA), Bordeaux, France
- EPHE, PSL Research University, Paris, France
| | - Maud Dupuy
- University of Bordeaux, CNRS-UMR 5287 - Institut de Neurosciences Cognitives et Intégratives d'Aquitaine (INCIA), Bordeaux, France
| | - Majd Abdallah
- Bordeaux University, CNRS, Bordeaux Bioinformatics Center, IBGC UMR 5095, Bordeaux, France
- Groupe d'Imagerie Neurofonctionnelle, Institut des Maladies Neurodégénératives-UMR 5293, CNRS, Univeristy of Bordeaux, Bordeaux, France
| | - Melina Fatseas
- University of Bordeaux, CNRS-UMR 5287 - Institut de Neurosciences Cognitives et Intégratives d'Aquitaine (INCIA), Bordeaux, France
- CH Charles Perrens, Bordeaux, France
- CHU Bordeaux, Bordeaux, France
| | - Fuschia Serre
- University of Bordeaux, CNRS UMR 6033- Sleep, Addiction and Neuropsychiatry (SANPSY), Bordeaux, France
| | - Marc Auriacombe
- CH Charles Perrens, Bordeaux, France
- University of Bordeaux, CNRS UMR 6033- Sleep, Addiction and Neuropsychiatry (SANPSY), Bordeaux, France
| | - David Misdrahi
- University of Bordeaux, CNRS-UMR 5287 - Institut de Neurosciences Cognitives et Intégratives d'Aquitaine (INCIA), Bordeaux, France
- CH Charles Perrens, Bordeaux, France
| | - Sylvie Berthoz
- University of Bordeaux, CNRS-UMR 5287 - Institut de Neurosciences Cognitives et Intégratives d'Aquitaine (INCIA), Bordeaux, France
- Institut Mutualiste Montsouris, Department of Psychiatry for Adolescents and Young Adults, Paris, France
| | - Joel Swendsen
- University of Bordeaux, CNRS-UMR 5287 - Institut de Neurosciences Cognitives et Intégratives d'Aquitaine (INCIA), Bordeaux, France
- EPHE, PSL Research University, Paris, France
| | - Edith V Sullivan
- Department of Psychiatry & Behavioral Sciences, Stanford University School of Medicine, Stanford, CA, United States
| | - Sandra Chanraud
- University of Bordeaux, CNRS-UMR 5287 - Institut de Neurosciences Cognitives et Intégratives d'Aquitaine (INCIA), Bordeaux, France
- EPHE, PSL Research University, Paris, France
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4
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Grewal KS, O'Connell ME, Kirk A, MacDonald SWS, Morgan D. Intraindividual variability measured with dispersion across diagnostic groups in a memory clinic sample. APPLIED NEUROPSYCHOLOGY. ADULT 2023; 30:639-648. [PMID: 34455884 DOI: 10.1080/23279095.2021.1970552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Increased intraindividual variability (IIV) has been linked to outcomes such as cognitive decline and dementia, suggesting IIV might add valuable diagnostic information beyond traditional neuropsychological interpretation. We explored whether a subtype of IIV, dispersion, can provide additional information for dementia diagnosis. In a sample of memory clinic patients, three cognitive status groups were identified: subjective cognitive impairment (SCI; n = 85), amnestic mild cognitive impairment (a-MCI; n = 16), and dementia due to Alzheimer's disease (AD; n = 48). Dispersion was computed as intraindividual standard deviations across multiple neuropsychological measures within three cognitive domains (executive functioning; immediate and delayed memory) and was compared for each diagnostic group using profile analysis. Patients with AD and a-MCI demonstrated less dispersion than patients with SCI in delayed memory. Results support existing theoretic perspectives on cognitive variability and age-related cognitive decline but suggest floor effects underlie suppression of dispersion in amnestic cognitive presentations. Questions remain about the contribution of IIV beyond impressions of impairment versus no impairment in these constrained representations of cognitive domains. Future investigations should investigate variability in SCI groups against controls to examine whether observed dispersion similarities between SCI and a-MCI or AD in immediate memory and executive functioning are meaningful.
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Affiliation(s)
- Karl S Grewal
- Department of Psychology, University of Saskatchewan, Saskatoon, Canada
| | - Megan E O'Connell
- Department of Psychology, University of Saskatchewan, Saskatoon, Canada
| | - Andrew Kirk
- Division of Neurology, Department of Medicine, University of Saskatchewan, Saskatoon, Canada
| | | | - Debra Morgan
- Canadian Centre for Health and Safety in Agriculture, University of Saskatchewan, Saskatoon, Canada
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Turrini S, Wong B, Eldaief M, Press DZ, Sinclair DA, Koch G, Avenanti A, Santarnecchi E. The multifactorial nature of healthy brain ageing: Brain changes, functional decline and protective factors. Ageing Res Rev 2023; 88:101939. [PMID: 37116664 DOI: 10.1016/j.arr.2023.101939] [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: 11/15/2022] [Revised: 04/14/2023] [Accepted: 04/24/2023] [Indexed: 04/30/2023]
Abstract
As the global population faces a progressive shift towards a higher median age, understanding the mechanisms underlying healthy brain ageing has become of paramount importance for the preservation of cognitive abilities. The first part of the present review aims to provide a comprehensive look at the anatomical changes the healthy brain endures with advanced age, while also summarizing up to date findings on modifiable risk factors to support a healthy ageing process. Subsequently, we describe the typical cognitive profile displayed by healthy older adults, conceptualizing the well-established age-related decline as an impairment of four main cognitive factors and relating them to their neural substrate previously described; different cognitive trajectories displayed by typical Alzheimer's Disease patients and successful agers with a high cognitive reserve are discussed. Finally, potential effective interventions and protective strategies to promote cognitive reserve and defer cognitive decline are reviewed and proposed.
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Affiliation(s)
- Sonia Turrini
- Precision Neuroscience & Neuromodulation Program, Gordon Center for Medical Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA; Centro studi e ricerche in Neuroscienze Cognitive, Dipartimento di Psicologia "Renzo Canestrari", Alma Mater Studiorum Università di Bologna, Campus di Cesena, Cesena, Italy
| | - Bonnie Wong
- Neuropsychology Program, Frontotemporal Disorders Unit, Massachusetts General Hospital, Harvard Medical School, Boston, MA , USA; Department of Psychiatry, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Mark Eldaief
- Department of Psychiatry, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA; Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Daniel Z Press
- Department of Neurology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - David A Sinclair
- Blavatnik Institute, Department of Genetics, Paul F. Glenn Center for Biology of ageing Research, Harvard Medical School, Boston, MA, USA
| | - Giacomo Koch
- Stroke Unit, Department of Systems Medicine, University of Tor Vergata, Rome, Italy; Department of Clinical and Behavioural Neurology, Santa Lucia Foundation IRCCS, Rome, Italy
| | - Alessio Avenanti
- Centro studi e ricerche in Neuroscienze Cognitive, Dipartimento di Psicologia "Renzo Canestrari", Alma Mater Studiorum Università di Bologna, Campus di Cesena, Cesena, Italy; Centro de Investigación en Neuropsicología y Neurociencias Cognitivas, Universidad Católica del Maule, Talca, Chile
| | - Emiliano Santarnecchi
- Precision Neuroscience & Neuromodulation Program, Gordon Center for Medical Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.
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DesRuisseaux LA, Suchy Y, Franchow EI. Intra-individual variability identifies individuals vulnerable to contextually induced executive lapses. Clin Neuropsychol 2023; 37:322-349. [PMID: 35392764 DOI: 10.1080/13854046.2022.2055651] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Contextual stressors, such as engagement in burdensome emotion regulation known as expressive suppression (ES), can result in transient but clinically meaningful decrement in performance on measures of executive functioning (EF). The goal of the present investigation was to examine whether intra-individual variability (IIV-I), which has been identified as an indicator of cognitive weakness, could serve as a marker of vulnerability to EF decrements due to both naturally-occurring and experimentally-manipulated ES. In Study 1, 180 cognitively healthy older adults completed the Push-Turn-Taptap (PTT) task to assess IIV-I, four Delis-Kaplan Executive Function System (D-KEFS) subtests to assess EF, and the Burden of State Emotion Regulation Questionnaire (B-SERQ) to assess naturally-occurring ES. In Study 2, a subset (n = 81) of participants underwent experimental manipulation to induce ES, followed by second administration of the D-KEFS to examine ES-induced decrements in EF. In Study 1, hierarchical linear regression yielded a significant interaction between ES and IIV-I as predictors of EF performance, demonstrating that high ES was associated with low EF only among individuals with high IIV-I. In Study 2, repeated measures ANOVA demonstrated an interaction between time (pre- vs. post- manipulation), group (ES vs. control), and IIV-I (high vs. low), such that only individuals who exhibited high IIV-I were negatively impacted by the ES manipulation. IIV-I moderates the association between ES and EF, such that only individuals with high IIV-I exhibit vulnerability to the impact of ES. Thus, IIV-I may act as a marker of vulnerability to temporary EF depletion.
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Affiliation(s)
| | - Yana Suchy
- Department of Psychology, University of Utah, Salt Lake City, UT, USA
| | - Emilie I Franchow
- Department of Psychology, University of Utah, Salt Lake City, UT, USA.,Advocate Aurora Healthcare, Milwaukee, WI, USA
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Kim J, Lee J, Nam K, Lee S. Investigation of genetic variants and causal biomarkers associated with brain aging. Sci Rep 2023; 13:1526. [PMID: 36707530 PMCID: PMC9883521 DOI: 10.1038/s41598-023-27903-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Accepted: 01/10/2023] [Indexed: 01/29/2023] Open
Abstract
Delta age is a biomarker of brain aging that captures differences between the chronological age and the predicted biological brain age. Using multimodal data of brain MRI, genomics, and blood-based biomarkers and metabolomics in UK Biobank, this study investigates an explainable and causal basis of high delta age. A visual saliency map of brain regions showed that lower volumes in the fornix and the lower part of the thalamus are key predictors of high delta age. Genome-wide association analysis of the delta age using the SNP array data identified associated variants in gene regions such as KLF3-AS1 and STX1. GWAS was also performed on the volumes in the fornix and the lower part of the thalamus, showing a high genetic correlation with delta age, indicating that they share a genetic basis. Mendelian randomization (MR) for all metabolomic biomarkers and blood-related phenotypes showed that immune-related phenotypes have a causal impact on increasing delta age. Our analysis revealed regions in the brain that are susceptible to the aging process and provided evidence of the causal and genetic connections between immune responses and brain aging.
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Affiliation(s)
- Jangho Kim
- Graduate School of Data Science, Seoul National University, Seoul, Republic of Korea
| | - Junhyeong Lee
- Graduate School of Data Science, Seoul National University, Seoul, Republic of Korea
| | - Kisung Nam
- Graduate School of Data Science, Seoul National University, Seoul, Republic of Korea
| | - Seunggeun Lee
- Graduate School of Data Science, Seoul National University, Seoul, Republic of Korea.
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Holmqvist SL, Thomas KR, Brenner EK, Edmonds EC, Calcetas A, Edwards L, Bordyug M, Bangen KJ. Longitudinal Intraindividual Cognitive Variability Is Associated With Reduction in Regional Cerebral Blood Flow Among Alzheimer's Disease Biomarker-Positive Older Adults. Front Aging Neurosci 2022; 14:859873. [PMID: 35875798 PMCID: PMC9300445 DOI: 10.3389/fnagi.2022.859873] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 06/06/2022] [Indexed: 02/03/2023] Open
Abstract
Intraindividual variability (IIV) across neuropsychological measures within a single testing session is a promising marker predictive of cognitive decline and development of Alzheimer's disease (AD). We have previously shown that greater IIV is cross-sectionally associated with reduced cerebral blood flow (CBF), but not with cortical thickness or brain volume, in older adults without dementia who were amyloid beta (Aβ) positive. However, there is little known about the association between change in IIV and CBF over time. Therefore, we examined 12-month longitudinal change in IIV and interactions of IIV and AD biomarker status on changes in regional CBF. Fifty-three non-demented Alzheimer's Disease Neuroimaging Initiative (ADNI) participants underwent lumbar puncture to obtain cerebrospinal fluid (CSF) at baseline and neuropsychological testing and magnetic resonance imaging (MRI) exams at baseline and 12-month follow-up evaluation. IIV was calculated as the intraindividual standard deviation across 6 demographically-corrected neuropsychological measures. Pulsed arterial spin labeling (ASL) MRI was acquired to quantify CBF and FreeSurfer-derived a priori CBF regions of interest (ROIs) were examined. AD biomarker positivity was determined using a published CSF p-tau/Aβ ratio cut-score. Change scores were calculated for IIV, CBF, and mean neuropsychological performance from baseline to 12 months. Hierarchical linear regression models showed that after adjusting for age and gender, there was a significant interaction between IIV change and biomarker-positivity (p-tau/Aβ+) for change in entorhinal and hippocampal CBF but not for the other ROIs. Specifically, increases in IIV were associated with reductions in entorhinal and hippocampal CBF among individuals who were biomarker-positive (n = 21). In contrast, there were no significant associations between change in IIV and CBF among those who were biomarker-negative (n = 32). Findings remained similar when analyses were performed adjusting for change in mean level of neuropsychological performance. Changes in IIV may be sensitive to changes in regional hypoperfusion in AD-vulnerable regions among AD biomarker-positive individuals, above and beyond demographics and mean neuropsychological performance. These findings provide further evidence supporting IIV as a potential marker of cerebrovascular brain changes in individuals at risk for dementia.
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Affiliation(s)
- Sophia L. Holmqvist
- Research Service, VA San Diego Healthcare System, San Diego, CA, United States
| | - Kelsey R. Thomas
- Research Service, VA San Diego Healthcare System, San Diego, CA, United States,Department of Psychiatry, University of California, San Diego, La Jolla, CA, United States
| | - Einat K. Brenner
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, United States
| | - Emily C. Edmonds
- Research Service, VA San Diego Healthcare System, San Diego, CA, United States,Department of Psychiatry, University of California, San Diego, La Jolla, CA, United States
| | - Amanda Calcetas
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, United States
| | - Lauren Edwards
- San Diego State University/University of California San Diego Joint Doctoral Program in Clinical Psychology, San Diego, CA, United States
| | - Maria Bordyug
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, United States
| | - Katherine J. Bangen
- Research Service, VA San Diego Healthcare System, San Diego, CA, United States,Department of Psychiatry, University of California, San Diego, La Jolla, CA, United States,*Correspondence: Katherine J. Bangen,
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Abstract
OBJECTIVE Discrepancies exist in reports of social cognition deficits in individuals with premanifest Huntington's disease (HD); however, the reason for this variability has not been investigated. The aims of this study were to (1) evaluate group- and individual-level social cognitive performance and (2) examine intra-individual variability (dispersion) across social cognitive domains in individuals with premanifest HD. METHOD Theory of mind (ToM), social perception, empathy, and social connectedness were evaluated in 35 individuals with premanifest HD and 29 healthy controls. Cut-off values beneath the median and 1.5 × the interquartile range below the 25th percentile (P25 - 1.5 × IQR) of healthy controls for each variable were established for a profiling method. Dispersion between social cognitive domains was also calculated. RESULTS Compared to healthy controls, individuals with premanifest HD performed worse on all social cognitive domains except empathy. Application of the profiling method revealed a large proportion of people with premanifest HD fell below healthy control median values across ToM (>80%), social perception (>57%), empathy (>54%), and social behaviour (>40%), with a percentage of these individuals displaying more pronounced impairments in empathy (20%) and ToM (22%). Social cognition dispersion did not differ between groups. No significant correlations were found between social cognitive domains and mood, sleep, and neurocognitive outcomes. CONCLUSIONS Significant group-level social cognition deficits were observed in the premanifest HD cohort. However, our profiling method showed that only a small percentage of these individuals experienced marked difficulties in social cognition, indicating the importance of individual-level assessments, particularly regarding future personalised treatments.
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Korkki SM, Papenberg G, Karalija N, Garrett DD, Riklund K, Lövdén M, Lindenberger U, Nyberg L, Bäckman L. Fronto-striatal dopamine D2 receptor availability is associated with cognitive variability in older individuals with low dopamine integrity. Sci Rep 2021; 11:21089. [PMID: 34702857 PMCID: PMC8548594 DOI: 10.1038/s41598-021-00106-y] [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: 06/25/2021] [Accepted: 09/30/2021] [Indexed: 11/09/2022] Open
Abstract
Within-person, moment-to-moment, variability in behavior increases with advancing adult age, potentially reflecting the influence of reduced structural and neurochemical brain integrity, especially that of the dopaminergic system. We examined the role of dopamine D2 receptor (D2DR) availability, grey-, and white-matter integrity, for between-person differences in cognitive variability in a large sample of healthy older adults (n = 181; 64-68 years) from the Cognition, Brain, and Aging (COBRA) study. Intra-individual variability (IIV) in cognition was measured as across-trial variability in participants' response times for tasks assessing perceptual speed and working memory, as well as for a control task of motor speed. Across the whole sample, no associations of D2DR availability, or grey- and white-matter integrity, to IIV were observed. However, within-person variability in cognition was increased in two subgroups of individuals displaying low mean-level cognitive performance, one of which was characterized by low subcortical and cortical D2DR availability. In this latter group, fronto-striatal D2DR availability correlated negatively with within-person variability in cognition. This finding suggests that the influence of D2DR availability on cognitive variability may be more easily disclosed among individuals with low dopamine-system integrity, highlighting the benefits of large-scale studies for delineating heterogeneity in brain-behavior associations in older age.
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Affiliation(s)
- Saana M. Korkki
- grid.10548.380000 0004 1936 9377Aging Research Center, Karolinska Institute and Stockholm University, Stockholm, Sweden
| | - Goran Papenberg
- grid.10548.380000 0004 1936 9377Aging Research Center, Karolinska Institute and Stockholm University, Stockholm, Sweden
| | - Nina Karalija
- grid.12650.300000 0001 1034 3451Department of Radiation Sciences, Diagnostic Radiology, Umeå University, Umeå, Sweden ,grid.12650.300000 0001 1034 3451Umeå Center for Functional Brain Imaging, Umeå University, Umeå, Sweden
| | - Douglas D. Garrett
- grid.419526.d0000 0000 9859 7917Center for Lifespan Psychology, Max Planck Institute for Human Development, Berlin, Germany ,grid.4372.20000 0001 2105 1091Max Planck UCL Centre for Computational Psychiatry and Ageing Research, Berlin, Germany
| | - Katrine Riklund
- grid.12650.300000 0001 1034 3451Department of Radiation Sciences, Diagnostic Radiology, Umeå University, Umeå, Sweden ,grid.12650.300000 0001 1034 3451Umeå Center for Functional Brain Imaging, Umeå University, Umeå, Sweden
| | - Martin Lövdén
- grid.8761.80000 0000 9919 9582Department of Psychology, University of Gothenburg, Gothenburg, Sweden
| | - Ulman Lindenberger
- grid.419526.d0000 0000 9859 7917Center for Lifespan Psychology, Max Planck Institute for Human Development, Berlin, Germany ,grid.4372.20000 0001 2105 1091Max Planck UCL Centre for Computational Psychiatry and Ageing Research, Berlin, Germany
| | - Lars Nyberg
- grid.12650.300000 0001 1034 3451Department of Radiation Sciences, Diagnostic Radiology, Umeå University, Umeå, Sweden ,grid.12650.300000 0001 1034 3451Umeå Center for Functional Brain Imaging, Umeå University, Umeå, Sweden ,grid.12650.300000 0001 1034 3451Department of Integrative Medical Biology, Umeå University, Umeå, Sweden
| | - Lars Bäckman
- grid.10548.380000 0004 1936 9377Aging Research Center, Karolinska Institute and Stockholm University, Stockholm, Sweden
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11
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MacDonald ME, Pike GB. MRI of healthy brain aging: A review. NMR IN BIOMEDICINE 2021; 34:e4564. [PMID: 34096114 DOI: 10.1002/nbm.4564] [Citation(s) in RCA: 46] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 05/08/2021] [Accepted: 05/11/2021] [Indexed: 06/12/2023]
Abstract
We present a review of the characterization of healthy brain aging using MRI with an emphasis on morphology, lesions, and quantitative MR parameters. A scope review found 6612 articles encompassing the keywords "Brain Aging" and "Magnetic Resonance"; papers involving functional MRI or not involving imaging of healthy human brain aging were discarded, leaving 2246 articles. We first consider some of the biogerontological mechanisms of aging, and the consequences of aging in terms of cognition and onset of disease. Morphological changes with aging are reviewed for the whole brain, cerebral cortex, white matter, subcortical gray matter, and other individual structures. In general, volume and cortical thickness decline with age, beginning in mid-life. Prevalent silent lesions such as white matter hyperintensities, microbleeds, and lacunar infarcts are also observed with increasing frequency. The literature regarding quantitative MR parameter changes includes T1 , T2 , T2 *, magnetic susceptibility, spectroscopy, magnetization transfer, diffusion, and blood flow. We summarize the findings on how each of these parameters varies with aging. Finally, we examine how the aforementioned techniques have been used for age prediction. While relatively large in scope, we present a comprehensive review that should provide the reader with sound understanding of what MRI has been able to tell us about how the healthy brain ages.
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Affiliation(s)
- M Ethan MacDonald
- Department of Electrical and Software Engineering, University of Calgary, Calgary, Alberta, Canada
- Departments of Radiology and Clinical Neuroscience, University of Calgary, Calgary, Alberta, Canada
- Healthy Brain Aging Laboratory, Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada
| | - G Bruce Pike
- Departments of Radiology and Clinical Neuroscience, University of Calgary, Calgary, Alberta, Canada
- Healthy Brain Aging Laboratory, Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada
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12
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Manning KJ, Preciado-Pina J, Wang L, Fitzgibbon K, Chan G, Steffens DC. Cognitive variability, brain aging, and cognitive decline in late-life major depression. Int J Geriatr Psychiatry 2021; 36:665-676. [PMID: 33169874 DOI: 10.1002/gps.5465] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Accepted: 11/07/2020] [Indexed: 11/08/2022]
Abstract
OBJECTIVES Older adults with late-life major depression (LLMD) are at increased risk of dementia. Dispersion, or within-person performance variability across cognitive tests, is a potential marker of cognitive decline. This study examined group differences in dispersion between LLMD and nondepressed healthy controls (HC) and investigated whether dispersion was a predictor of cognitive performance 1 year later in LLMD. We also explored demographic, clinical, and structural imaging correlates of dispersion in LLMD and HC. We hypothesized that dispersion would be greater in LLMD compared with HC and would be associated with worse cognitive performance 1 year later in LLMD. DESIGN Participants were enrolled in the Neurobiology of Late-Life Depression, a naturalistic longitudinal investigation of the predictors of poor illness course in LLMD. PARTICIPANTS The baseline sample consisted of 121 older adults with LLMD and 39 HC; of these subjects, 94 LLMD and 35 HC underwent magnetic resonance imaging (MRI). One-year cognitive data were available for 107 LLMD patients. MEASUREMENTS All participants underwent detailed clinical and structural MRI at baseline. LLMD participants also completed a comprehensive cognitive evaluation 1 year later. RESULTS Higher test dispersion was evident in LLMD when compared with nondepressed controls. Greater baseline dispersion predicted 1-year cognitive decline in LLMD patients even when controlling for baseline cognitive functioning and demographic and clinical confounders. Dispersion was correlated with white matter lesions in LLMD but not HC. Dispersion was also correlated with anxiety in both LLMD and HC. CONCLUSIONS Dispersion is a marker of neurocognitive integrity that requires further exploration in LLMD.
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Affiliation(s)
- Kevin J Manning
- Department of Psychiatry, University of Connecticut School of Medicine, Farmington, Connecticut, USA
| | - Joshua Preciado-Pina
- Department of Psychology, The University of Texas at El Paso, El Paso, Texas, USA
| | - Lihong Wang
- Department of Psychiatry, University of Connecticut School of Medicine, Farmington, Connecticut, USA
| | - Kimberly Fitzgibbon
- Department of Psychiatry, University of Connecticut School of Medicine, Farmington, Connecticut, USA
| | - Grace Chan
- Department of Psychiatry, University of Connecticut School of Medicine, Farmington, Connecticut, USA
| | - David C Steffens
- Department of Psychiatry, University of Connecticut School of Medicine, Farmington, Connecticut, USA
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13
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Lopez-Sosa F, Reneses B, Sanmartino F, Galarza-Vallejo A, Garcia-Albea J, Cruz-Gomez AJ, Yebra M, Oliviero A, Barcia JA, Strange BA, Gonzalez-Rosa JJ. Nucleus Accumbens Stimulation Modulates Inhibitory Control by Right Prefrontal Cortex Activation in Obsessive-Compulsive Disorder. Cereb Cortex 2021; 31:2742-2758. [PMID: 33406245 DOI: 10.1093/cercor/bhaa397] [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: 08/20/2020] [Revised: 12/03/2020] [Accepted: 12/11/2020] [Indexed: 11/14/2022] Open
Abstract
Inhibitory control is considered a compromised cognitive function in obsessive-compulsive (OCD) patients and likely linked to corticostriatal circuitry disturbances. Here, 9 refractory OCD patients treated with deep brain stimulation (DBS) were evaluated to address the dynamic modulations of large-scale cortical network activity involved in inhibitory control after nucleus accumbens (NAc) stimulation and their relationship with cortical thickness. A comparison of DBS "On/Off" states showed that patients committed fewer errors and exhibited increased intraindividual reaction time variability, resulting in improved goal maintenance abilities and proactive inhibitory control. Visual P3 event-related potentials showed increased amplitudes during Go/NoGo performance. Go and NoGo responses increased cortical activation mainly over the right inferior frontal gyrus and medial frontal gyrus, respectively. Moreover, increased cortical activation in these areas was equally associated with a higher cortical thickness within the prefrontal cortex. These results highlight the critical role of NAc DBS for preferentially modulating the neuronal activity underlying sustained speed responses and inhibitory control in OCD patients and show that it is triggered by reorganizing brain functions to the right prefrontal regions, which may depend on the underlying cortical thinning. Our findings provide updated structural and functional evidence that supports critical dopaminergic-mediated frontal-striatal network interactions in OCD.
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Affiliation(s)
- Fernando Lopez-Sosa
- Psychophysiology and Neuroimaging Group, Institute of Biomedical Research Cadiz (INiBICA), 11009 Cádiz, Spain.,Laboratory for Clinical Neuroscience, Centre for Biomedical Technology (CTB), Technical University of Madrid (UPM), 28040 Madrid, Spain
| | - Blanca Reneses
- Department of Psychiatry, Health Research Institute of Hospital Clinico San Carlos (IdISSC), Complutense University of Madrid (UCM), 28040 Madrid, Spain
| | | | - Ana Galarza-Vallejo
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology (CTB), Technical University of Madrid (UPM), 28040 Madrid, Spain
| | - Julia Garcia-Albea
- Department of Psychiatry, Health Research Institute of Hospital Clinico San Carlos (IdISSC), Complutense University of Madrid (UCM), 28040 Madrid, Spain
| | - Alvaro J Cruz-Gomez
- Psychophysiology and Neuroimaging Group, Institute of Biomedical Research Cadiz (INiBICA), 11009 Cádiz, Spain
| | - Mar Yebra
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology (CTB), Technical University of Madrid (UPM), 28040 Madrid, Spain.,Department of Neurosurgery, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA
| | - Antonio Oliviero
- FENNSI Group, Hospital Nacional de Parapléjicos, SESCAM, 45004 Toledo, Spain
| | - Juan A Barcia
- Department of Neurosurgery, Health Research Institute of Hospital Clinico San Carlos (IdISSC), Complutense University of Madrid (UCM), 28040 Madrid, Spain
| | - Bryan A Strange
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology (CTB), Technical University of Madrid (UPM), 28040 Madrid, Spain.,Department of Neuroimaging, Alzheimer's Disease Research Centre, Reina Sofia-CIEN Foundation, 28013 Madrid, Spain
| | - Javier J Gonzalez-Rosa
- Psychophysiology and Neuroimaging Group, Institute of Biomedical Research Cadiz (INiBICA), 11009 Cádiz, Spain.,Laboratory for Clinical Neuroscience, Centre for Biomedical Technology (CTB), Technical University of Madrid (UPM), 28040 Madrid, Spain.,Department of Psychology, University of Cadiz. 11003 Cádiz, Spain
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14
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Arce Rentería M, Byrd D, Coulehan K, Miranda C, Fuentes A, Rosario AK, Morris EP, Rivera Mindt M. Neurocognitive intra-individual variability within HIV+ adults with and without current substance use. Neuropsychology 2019; 34:321-330. [PMID: 31886690 DOI: 10.1037/neu0000612] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
OBJECTIVE HIV infection and current substance use (SU) are linked to cognitive and functional deficits, yet findings on their combined effects are mixed. Neurocognitive intraindividual variability, measured as dispersion of scores across a neuropsychological battery, is associated with worse cognitive outcomes and functional deficits among HIV+ adults but has not been studied in the context of HIV+ adults with current SU. We hypothesized that, among HIV+ adults, current SU would be associated with greater dispersion, that greater dispersion would be associated with worse medication adherence, and that this relationship would be worse among substance users. METHOD Forty HIV+ adults completed neuropsychological, psychiatric, SU, and medical evaluations and an electronic medication adherence measure. General linear models evaluated the main effect of SU status on neurocognitive dispersion, and models stratified by SU status evaluated the effect of dispersion on medication adherence, adjusting for relevant covariates. RESULTS The SU+ group showed greater dispersion than did the SU- group, t(38) = 2.74, p = .049, d = 0.81, but this association did not survive multiple comparisons. Stratified analyses indicated a negative relationship between dispersion and medication adherence among the SU+ group but not in the SU- group; however, this effect was reduced after accounting for depressive symptoms. CONCLUSIONS We found preliminary evidence that current SU is associated with greater neurocognitive dispersion among HIV+ adults. SU and neurocognitive dispersion may have a synergistic effect on medication adherence; however, this effect is largely accounted for by depressive symptoms. Future research should examine progression of dispersion in HIV and consequent neurocognitive and functional deficits in those with current SU. (PsycINFO Database Record (c) 2020 APA, all rights reserved).
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15
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Structural Brain Correlates of Loneliness among Older Adults. Sci Rep 2019; 9:13569. [PMID: 31537846 PMCID: PMC6753249 DOI: 10.1038/s41598-019-49888-2] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Accepted: 08/29/2019] [Indexed: 12/13/2022] Open
Abstract
Ample evidence indicates that loneliness in old age is associated with poor bodily and mental health. However, little is known about structural cerebral correlates of loneliness in healthy older adults. We examined such correlates in a magnetic resonance imaging (MRI) subsample of 319 older adults aged 61 to 82 years drawn from the Berlin Aging Study II. Using voxel-based morphometry (VBM) and structural equation modeling (SEM), latent hierarchical regression analyses were performed to examine associations of (i) loneliness, (ii) a range of covariates, and (iii) loneliness by covariate interactions with latent brain volume estimates of brain structures known to be involved in processing, expressing, and regulating emotions. Results from whole-brain VBM analyses showed that individuals with higher loneliness scores tended to have smaller gray matter volumes in three clusters comprising (i) the left amygdala/anterior hippocampus, (ii) the left posterior parahippocampus and (iii) the left cerebellum. Significant associations and interactions between loneliness and latent factors for the amygdala and the hippocampus were confirmed with a region-of-interest (ROI)-based approach. These findings suggest that individual differences in loneliness among older adults are correlated with individual differences in the volumes of brain regions that are central to cognitive processing and emotional regulation, also after correcting for confounders such as social network size. We discuss possible mechanisms underlying these associations and their implications.
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Erickson KI, Grove GA, Burns JM, Hillman CH, Kramer AF, McAuley E, Vidoni ED, Becker JT, Butters MA, Gray K, Huang H, Jakicic JM, Kamboh MI, Kang C, Klunk WE, Lee P, Marsland AL, Mettenburg J, Rogers RJ, Stillman CM, Sutton BP, Szabo-Reed A, Verstynen TD, Watt JC, Weinstein AM, Wollam ME. Investigating Gains in Neurocognition in an Intervention Trial of Exercise (IGNITE): Protocol. Contemp Clin Trials 2019; 85:105832. [PMID: 31465859 PMCID: PMC6815730 DOI: 10.1016/j.cct.2019.105832] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 08/16/2019] [Accepted: 08/19/2019] [Indexed: 12/16/2022]
Abstract
Despite the ubiquity of normal age-related cognitive decline there is an absence of effective approaches for improving neurocognitive health. Fortunately, moderate intensity exercise is a promising method for improving brain and cognitive health in late life, but its effectiveness remains a matter of skepticism and debate because of the absence of large, comprehensive, Phase III clinical trials. Here we describe the protocol for such a randomized clinical trial called IGNITE (Investigating Gains in Neurocognition in an Intervention Trial of Exercise), a study capable of more definitively addressing whether exercise influences cognitive and brain health in cognitively normal older adults. We are conducting a 12-month, multi-site, randomized dose-response exercise trial in 639 cognitively normal adults between 65 and 80 years of age. Participants are randomized to (1) a moderate intensity aerobic exercise condition of 150 min/week (N = 213), (2) a moderate intensity aerobic exercise condition at 225 min/week (N = 213), or (3) a light intensity stretching-and-toning control condition for 150 min/week (N = 213). Participants are engaging in 3 days/week of supervised exercise and two more days per week of unsupervised exercise for 12 months. A comprehensive cognitive battery, blood biomarkers and battery of psychosocial questionnaires is assessed at baseline, 6 and 12-months. In addition, brain magnetic resonance imaging, physiological biomarkers, cardiorespiratory fitness, physical function, and positron emission tomography of amyloid deposition are assessed at baseline and at the 12-month follow-up. The results from this trial could transform scientific-based policy and health care recommendations for approaches to improve cognitive function in cognitively normal older adults.
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Affiliation(s)
- Kirk I Erickson
- Department of Psychology, University of Pittsburgh, USA.; Discipline of Exercise Science, College of Science, Health, Engineering and Education, Murdoch University, Australia.
| | | | - Jeffrey M Burns
- Department of Neurology, University of Kansas Medical Center, USA
| | - Charles H Hillman
- Department of Psychology, Northeastern University, USA; Department of Physical Therapy, Movement, & Rehabilitation Sciences, Northeastern University, USA
| | - Arthur F Kramer
- Department of Psychology, Northeastern University, USA; Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana Champaign, USA
| | - Edward McAuley
- Department of Kinesiology and Community Health, University of Illinois at Urbana Champaign, USA
| | - Eric D Vidoni
- Department of Neurology, University of Kansas Medical Center, USA
| | - James T Becker
- Department of Psychology, University of Pittsburgh, USA.; Department of Psychiatry, University of Pittsburgh, USA; Department of Neurology, University of Pittsburgh, USA
| | | | - Katerina Gray
- Department of Psychology, University of Pittsburgh, USA
| | - Haiqing Huang
- Department of Psychology, University of Pittsburgh, USA
| | - John M Jakicic
- Department of Health and Physical Activity, University of Pittsburgh, USA
| | - M Ilyas Kamboh
- Department of Human Genetics, University of Pittsburgh, USA
| | - Chaeryon Kang
- Department of Biostatistics, University of Pittsburgh, USA
| | | | - Phil Lee
- Department of Radiology, University of Kansas Medical Center, USA
| | | | | | - Renee J Rogers
- Department of Health and Physical Activity, University of Pittsburgh, USA
| | | | - Bradley P Sutton
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana Champaign, USA
| | - Amanda Szabo-Reed
- Department of Internal Medicine, University of Kansas Medical Center, USA
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17
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Bento-Torres J, Bento-Torres NVO, Stillman CM, Grove GA, Huang H, Uyar F, Watt JC, Wollam ME, Erickson KI. Associations between cardiorespiratory fitness, physical activity, intraindividual variability in behavior, and cingulate cortex in younger adults. JOURNAL OF SPORT AND HEALTH SCIENCE 2019; 8:315-324. [PMID: 31333884 PMCID: PMC6620364 DOI: 10.1016/j.jshs.2019.03.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 10/10/2018] [Accepted: 11/05/2018] [Indexed: 05/02/2023]
Abstract
BACKGROUND Higher levels of cardiorespiratory fitness (CRF) and greater amounts of physical activity have been associated with lower intraindividual variability (IIV) in executive function in children and older adults. In the present study, we examined whether CRF, measured as maximal oxygen uptake (VO2max), and daily volume of moderate-to-vigorous intensity physical activity (MVPA) were associated with IIV of reaction time during performance of the incongruent condition of the Stroop task in younger adults. Further, we examined whether the thickness of the cingulate cortex was associated with regulating variability in reaction time performance in the context of CRF or physical activity. METHODS CRF (measured as VO2max), accelerometry-measured MVPA, Stroop performance, and thickness of the rostral anterior cingulate cortex (rACC) derived from magnetic resonance imaging data were collected in 48 younger adults (age = 24.58 ± 4.95 years, mean ± SD). Multiple regression was used to test associations between IIV during the Stroop task and CRF, MVPA, and rACC thickness. Mediation was tested using maximum likelihood estimation with bootstrapping. RESULTS Consistent with our predictions, higher VO2max was associated with greater rACC thickness for the right hemisphere and greater daily amounts of MVPA were associated with greater rACC thickness for both the left and right hemispheres. Greater thickness of the right rACC was associated with lower IIV for the incongruent condition of the Stroop task. CRF and MVPA were not directly associated with IIV. However, we did find that IIV and both CRF and MVPA were indirectly associated via the thickness of the right rACC. CONCLUSION These results indicate that higher CRF and greater daily volume of MVPA may be associated with lower IIV during the Stroop task via structural integrity of the rACC. Randomized controlled trials of MVPA would provide crucial information about the causal relations between these variables.
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Affiliation(s)
- João Bento-Torres
- Institute of Biological Science, Federal University of Pará, Belém, Pará 66075-110, Brazil
| | | | - Chelsea M. Stillman
- Department of Psychiatry, University of Pittsburgh Medical School, Pittsburgh, PA 15260, USA
| | - George A. Grove
- Department of Psychology, University of Pittsburgh, Pittsburgh, PA 15260, USA
| | - Haiqing Huang
- Department of Psychology, University of Pittsburgh, Pittsburgh, PA 15260, USA
| | - Fatma Uyar
- Department of Psychology, University of Pittsburgh, Pittsburgh, PA 15260, USA
| | - Jennifer C. Watt
- Department of Psychology, University of Pittsburgh, Pittsburgh, PA 15260, USA
| | - Mariegold E. Wollam
- Department of Psychology, University of Pittsburgh, Pittsburgh, PA 15260, USA
| | - Kirk I. Erickson
- Department of Psychiatry, University of Pittsburgh Medical School, Pittsburgh, PA 15260, USA
- Department of Psychology, University of Pittsburgh, Pittsburgh, PA 15260, USA
- Corresponding author.
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18
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Booth T, Dykiert D, Corley J, Gow AJ, Morris Z, Muñoz Maniega S, Royle NA, Del C Valdés Hernández M, Starr JM, Penke L, Bastin ME, Wardlaw JM, Deary IJ. Reaction time variability and brain white matter integrity. Neuropsychology 2019; 33:642-657. [PMID: 31246073 PMCID: PMC6683973 DOI: 10.1037/neu0000483] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Objective: Mean speed of responding is the most commonly used measure in the assessment of reaction time (RT). An alternative measure is intraindividual variability (IIV): the inconsistency of responding across multiple trials of a test. IIV has been suggested as an important indicator of central nervous system functioning, and as such, there has been increasing interest in the associations between IIV and brain imaging metrics. Results however, have been inconsistent. The present seeks to provide a comprehensive evaluation of the associations between a variety of measures of brain white matter integrity and individual differences in choice RT (CRT) IIV. Method: MRI brain scans of members of the Lothian Birth Cohort 1936 were assessed to obtain measures of the volume and severity of white matter hyperintensities, and the integrity of brain white matter tracts. CRT was assessed with a 4 CRT task on a separate occasion. Data were analyzed using multiple regression (N range = 358–670). Results: Greater volume of hyperintensities and more severe hyperintensities in frontal regions were associated with higher CRT IIV. White matter tract integrity, as assessed by both fractional anisotropy and mean diffusivity, showed the smallest effect sizes in associations with CRT IIV. Associations with hyperintensities were attenuated and no longer significant after controlling for M CRT. Conclusions: Taken together, the results of the present study suggested that IIV was not incrementally predictive of white matter integrity over mean speed. This is in contrast to previous reports, and highlights the need for further study. Variability in speeded cognitive test performance has been argued to be a potential early marker of cognitive decline and progression into mild cognitive impairment in aging. Evidence as to the robustness of the relationship, and the potential neurological underpinnings is varied. Our results suggest that average speeded performance, not variability, may be more reliably related to various measures of the brain. These findings are in contrast to much of the extant literature, highlighting the need for further research.
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Affiliation(s)
- Tom Booth
- Centre for Cognitive Ageing and Cognitive Epidemiology
| | | | - Janie Corley
- Centre for Cognitive Ageing and Cognitive Epidemiology
| | - Alan J Gow
- Centre for Cognitive Ageing and Cognitive Epidemiology
| | - Zoe Morris
- Brain Research Imaging Centre, Division of Neuroimaging Sciences, The University of Edinburgh
| | | | | | | | | | - Lars Penke
- Centre for Cognitive Ageing and Cognitive Epidemiology
| | - Mark E Bastin
- Centre for Cognitive Ageing and Cognitive Epidemiology
| | - Joanna M Wardlaw
- Brain Research Imaging Centre, Division of Neuroimaging Sciences, The University of Edinburgh
| | - Ian J Deary
- Centre for Cognitive Ageing and Cognitive Epidemiology
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Bangen KJ, Weigand AJ, Thomas KR, Delano-Wood L, Clark LR, Eppig J, Werhane ML, Edmonds EC, Bondi MW. Cognitive dispersion is a sensitive marker for early neurodegenerative changes and functional decline in nondemented older adults. Neuropsychology 2019; 33:599-608. [PMID: 30896235 DOI: 10.1037/neu0000532] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
OBJECTIVE Intraindividual cognitive variability (IIV), a measure of within-person variability across cognitive measures at a single time point, is associated with mild cognitive impairment (MCI) and Alzheimer's disease (AD). Little is known regarding brain changes underlying IIV, or the relationship between IIV and functional ability. Therefore, we investigated the association between IIV and cerebral atrophy in AD-vulnerable regions and everyday functioning in nondemented older adults. METHOD 736 Alzheimer's Disease Neuroimaging Initiative (ADNI) participants (285 cognitively normal [CN]; 451 MCI) underwent neuropsychological testing and serial MRI over 2 years. Linear mixed effects models examined the association between baseline IIV and change in entorhinal cortex thickness, hippocampal volume, and everyday functioning. RESULTS Adjusting for age, sex, apolipoprotein E genotype, amyloid-β positivity, and mean level of cognitive performance, higher baseline IIV predicted faster rates of entorhinal and hippocampal atrophy, as well as functional decline. Higher IIV was associated with both entorhinal and hippocampal atrophy among MCI participants but selective vulnerability of the entorhinal cortex among CN individuals. CONCLUSIONS IIV was associated with more widespread medial temporal lobe (MTL) atrophy in individuals with MCI relative to CN, suggesting that IIV may be tracking advancing MTL pathologic changes across the continuum of aging, MCI, and dementia. Findings suggest that cognitive dispersion may be a sensitive marker of neurodegeneration and functional decline in nondemented older adults. (PsycINFO Database Record (c) 2019 APA, all rights reserved).
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Affiliation(s)
| | | | - Kelsey R Thomas
- Research Service and Psychology Service, Veterans Affairs San Diego Healthcare System
| | - Lisa Delano-Wood
- Psychology Service, Veterans Affairs San Diego Healthcare System
| | - Lindsay R Clark
- Wisconsin Alzheimer's Institute, University of Wisconsin School of Medicine
| | - Joel Eppig
- San Diego Joint Doctoral Program in Clinical Psychology, San Diego State University/University of California, San Diego
| | - Madeleine L Werhane
- San Diego Joint Doctoral Program in Clinical Psychology, San Diego State University/University of California, San Diego
| | - Emily C Edmonds
- Research Service, Veterans Affairs San Diego Healthcare System
| | - Mark W Bondi
- Psychology Service, Veterans Affairs San Diego Healthcare System
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Costa AS, Dogan I, Schulz JB, Reetz K. Going beyond the mean: Intraindividual variability of cognitive performance in prodromal and early neurodegenerative disorders. Clin Neuropsychol 2019; 33:369-389. [PMID: 30663511 DOI: 10.1080/13854046.2018.1533587] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
OBJECTIVE Intraindividual variability (IIV), generally defined as short-term variations in behavior, has been proposed as a sign of subtle early impairment in neurodegenerative disorders, presumably associated with the disintegration of neuronal network connectivity. We aim to provide a review of IIV as a sensitive cognitive marker in prodromal neurodegenerative disorders. METHOD A narrative review focusing not only on theoretical and methodological definitions, including an overview on the neural correlates of IIV, but mainly on results from population-based and clinical-based studies on the role of IIV as a reliable predictor of mild cognitive impairment (MCI) and conversion to dementia in neurodegenerative disorders, mostly Alzheimer's and Parkinson's disease. RESULTS Most studies focus on MCI and Alzheimer's disease and demonstrate that IIV is a reliable cognitive marker. IIV is partly more sensitive than mean performance in the prediction of cognitive impairment or progressive deterioration and is independent of socio-demographic variables and disease mediators (e.g., genetic susceptibility). Neuroimaging data, mostly from healthy subjects, suggest a relationship between IIV and dysfunction of the default mode network, presumably mediated by white matter disintegration in frontal and parietal areas. CONCLUSIONS IIV measures may provide valuable information about diagnosis and progression in prodromal stages of neurodegenerative disorders. Thus, further conceptual and methodological clarifications are needed to justify the inclusion of IIV as a sensible cognitive marker in routine clinical neuropsychological assessment.
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Affiliation(s)
- Ana Sofia Costa
- a Neurocognition Unit, Department of Neurology , Hospital de Braga , Braga , Portugal.,b Department of Neurology , RWTH Aachen University , Aachen , Germany.,c JARA-BRAIN Institute Molecular Neuroscience and Neuroimaging, Forschungszentrum Jülich GmbH and RWTH Aachen University , Aachen , Germany
| | - Imis Dogan
- b Department of Neurology , RWTH Aachen University , Aachen , Germany.,c JARA-BRAIN Institute Molecular Neuroscience and Neuroimaging, Forschungszentrum Jülich GmbH and RWTH Aachen University , Aachen , Germany
| | - Jörg B Schulz
- b Department of Neurology , RWTH Aachen University , Aachen , Germany.,c JARA-BRAIN Institute Molecular Neuroscience and Neuroimaging, Forschungszentrum Jülich GmbH and RWTH Aachen University , Aachen , Germany
| | - Kathrin Reetz
- b Department of Neurology , RWTH Aachen University , Aachen , Germany.,c JARA-BRAIN Institute Molecular Neuroscience and Neuroimaging, Forschungszentrum Jülich GmbH and RWTH Aachen University , Aachen , Germany
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Lydon-Staley DM, Bassett DS. The Promise and Challenges of Intensive Longitudinal Designs for Imbalance Models of Adolescent Substance Use. Front Psychol 2018; 9:1576. [PMID: 30210404 PMCID: PMC6121035 DOI: 10.3389/fpsyg.2018.01576] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2018] [Accepted: 08/07/2018] [Indexed: 11/13/2022] Open
Abstract
Imbalance models of adolescent brain development attribute the increasing engagement in substance use during adolescence to within-person changes in the functional balance between the neural systems underlying socio-emotional, incentive processing, and cognitive control. However, the experimental designs and analytic techniques used to date do not lend themselves to explicit tests of how within-person change and within-person variability in socio-emotional processing and cognitive control place individual adolescents at risk for substance use. For a more complete articulation and a more stringent test of these models, we highlight the promise and challenges of using intensive longitudinal designs and analysis techniques that encompass many (often >10) within-person measurement occasions. Use of intensive longitudinal designs will lend researchers the tools required to make within-person inferences in individual adolescents that will ultimately align imbalance models of adolescent substance use with the methodological frameworks used to test them.
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Affiliation(s)
- David M. Lydon-Staley
- Department of Bioengineering, University of Pennsylvania, Philadelphia, PA, United States
| | - Danielle S. Bassett
- Department of Bioengineering, University of Pennsylvania, Philadelphia, PA, United States
- Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, PA, United States
- Department of Neurology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States
- Department of Physics & Astronomy, College of Arts and Sciences, University of Pennsylvania, Philadelphia, PA, United States
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22
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Ramanoël S, Hoyau E, Kauffmann L, Renard F, Pichat C, Boudiaf N, Krainik A, Jaillard A, Baciu M. Gray Matter Volume and Cognitive Performance During Normal Aging. A Voxel-Based Morphometry Study. Front Aging Neurosci 2018; 10:235. [PMID: 30123123 PMCID: PMC6085481 DOI: 10.3389/fnagi.2018.00235] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Accepted: 07/18/2018] [Indexed: 12/21/2022] Open
Abstract
Normal aging is characterized by decline in cognitive functioning in conjunction with extensive gray matter (GM) atrophy. A first aim of this study was to determine GM volume differences related to aging by comparing two groups of participants, middle-aged group (MAG, mean age 41 years, N = 16) and older adults (OG, mean age 71 years, N = 14) who underwent an magnetic resonance images (MRI) voxel-based morphometry (VBM) evaluation. The VBM analyses included two optimized pipelines, for the cortex and for the cerebellum. Participants were also evaluated on a wide range of cognitive tests assessing both domain-general and language-specific processes, in order to examine how GM volume differences between OG and MAG relate to cognitive performance. Our results show smaller bilateral GM volume in the OG relative to the MAG, in several cerebral and right cerebellar regions involved in language and executive functions. Importantly, our results also revealed smaller GM volume in the right cerebellum in OG relative to MAG, supporting the idea of a complex cognitive role for this structure. This study provides a broad picture of cerebral, but also cerebellar and cognitive changes associated with normal aging.
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Affiliation(s)
- Stephen Ramanoël
- INSERM/CNRS, Institut Vision, Sorbonne University, Pierre and Marie Curie Universities (UPMC) Paris 06, Paris, France
| | - Elena Hoyau
- CNRS LPNC UMR 5105, University of Grenoble Alpes, Grenoble, France
| | - Louise Kauffmann
- CNRS LPNC UMR 5105, University of Grenoble Alpes, Grenoble, France
- CNRS, Grenoble INP, GIPSA-lab, University of Grenoble Alpes, Grenoble, France
| | - Félix Renard
- UMS IRMaGe Grenoble Hospital, University of Grenoble Alpes, Grenoble, France
| | - Cédric Pichat
- CNRS LPNC UMR 5105, University of Grenoble Alpes, Grenoble, France
| | - Naïla Boudiaf
- CNRS LPNC UMR 5105, University of Grenoble Alpes, Grenoble, France
| | - Alexandre Krainik
- UMS IRMaGe Grenoble Hospital, University of Grenoble Alpes, Grenoble, France
- Grenoble Institute of Neuroscience, University of Grenoble Alpes, Grenoble, France
| | - Assia Jaillard
- UMS IRMaGe Grenoble Hospital, University of Grenoble Alpes, Grenoble, France
| | - Monica Baciu
- CNRS LPNC UMR 5105, University of Grenoble Alpes, Grenoble, France
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23
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Buczylowska D, Petermann F. Intraindividual Variability in Executive Function Performance in Healthy Adults: Cross-Sectional Analysis of the NAB Executive Functions Module. Front Psychol 2018; 9:329. [PMID: 29593624 PMCID: PMC5861463 DOI: 10.3389/fpsyg.2018.00329] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Accepted: 02/27/2018] [Indexed: 11/13/2022] Open
Abstract
The current study was aimed at investigating across-tasks intraindividual variability, also termed dispersion, in EF performance. The German adaptation of the Neuropsychological Assessment Battery (NAB) was used as a measure of EFs. Data of 444 participants aged 18-99 from six NAB Executive Functions Module subtests (i.e., Planning, Mazes, Letter Fluency, Judgment, Categories, and Word Generation) along with the NAB Total Index score as a measure of overall cognitive ability were analyzed. Maximum discrepancy (MD) was applied as a measure of dispersion. MD values ranged from 0.47 to 5.20 indicating substantial across-tasks dispersion in EF performance. Furthermore, dispersion moderately decreased with advancing age. Taking overall cognitive ability into account revealed that dispersion might be lower at older ages; especially, when associated with low overall ability levels. The dedifferentiation hypothesis offers a plausible explanation for these findings. That is, the cognitive profiles of older people might be less heterogenous than that of younger people, which may be due to age-related central nervous system constraints.
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Affiliation(s)
- Dorota Buczylowska
- Center of Clinical Psychology and Rehabilitation, University of Bremen, Bremen, Germany
| | - Franz Petermann
- Center of Clinical Psychology and Rehabilitation, University of Bremen, Bremen, Germany
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24
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Clark US, Arce Rentería M, Hegde RR, Morgello S. Early Life Stress-Related Elevations in Reaction Time Variability Are Associated with Brain Volume Reductions in HIV+ Adults. Front Behav Neurosci 2018; 12:6. [PMID: 29441001 PMCID: PMC5797588 DOI: 10.3389/fnbeh.2018.00006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Accepted: 01/10/2018] [Indexed: 12/17/2022] Open
Abstract
There is burgeoning evidence that, among HIV+ adults, exposure to high levels of early life stress (ELS) is associated with increased cognitive impairment as well as brain volume abnormalities and elevated neuropsychiatric symptoms. Currently, we have a limited understanding of the degree to which cognitive difficulties observed in HIV+ High-ELS samples reflect underlying neural abnormalities rather than increases in neuropsychiatric symptoms. Here, we utilized a behavioral marker of cognitive function, reaction time intra-individual variability (RT-IIV), which is sensitive to both brain volume reductions and neuropsychiatric symptoms, to elucidate the unique contributions of brain volume abnormalities and neuropsychiatric symptoms to cognitive difficulties in HIV+ High-ELS adults. We assessed the relation of RT-IIV to neuropsychiatric symptom levels and total gray and white matter volumes in 44 HIV+ adults (26 with high ELS). RT-IIV was examined during a working memory task. Self-report measures assessed current neuropsychiatric symptoms (depression, stress, post-traumatic stress disorder). Magnetic resonance imaging was used to quantify total gray and white matter volumes. Compared to Low-ELS participants, High-ELS participants exhibited elevated RT-IIV, elevated neuropsychiatric symptoms, and reduced gray and white matter volumes. Across the entire sample, RT-IIV was significantly associated with gray and white matter volumes, whereas significant associations with neuropsychiatric symptoms were not observed. In the High-ELS group, despite the presence of elevated neuropsychiatric symptom levels, brain volume reductions explained more than 13% of the variance in RT-IIV, whereas neuropsychiatric symptoms explained less than 1%. Collectively, these data provide evidence that, in HIV+ High-ELS adults, ELS-related cognitive difficulties (as indexed by RT-IIV) exhibit strong associations with global brain volumes, whereas ELS-related elevations in neuropsychiatric symptoms appear to contribute minimally to these cognitive difficulties. Such findings support a growing body of evidence indicating that high ELS exposure is a significant risk factor for neurocognitive dysfunction in HIV+ adults. Further, these data highlight the need to better understand how ELS-related pathophysiological mechanisms contribute to volumetric and other neural abnormalities in HIV+ individuals.
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Affiliation(s)
- Uraina S Clark
- Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY, United States
| | | | - Rachal R Hegde
- Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY, United States
| | - Susan Morgello
- Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY, United States
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25
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Stickel A, Kawa K, Walther K, Glisky E, Richholt R, Huentelman M, Ryan L. Age-Modulated Associations between KIBRA, Brain Volume, and Verbal Memory among Healthy Older Adults. Front Aging Neurosci 2018; 9:431. [PMID: 29375362 PMCID: PMC5767716 DOI: 10.3389/fnagi.2017.00431] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Accepted: 12/15/2017] [Indexed: 12/15/2022] Open
Abstract
The resource modulation hypothesis suggests that the influence of genes on cognitive functioning increases with age. The KIBRA single nucleotide polymorphism rs17070145, associated with episodic memory and working memory, has been suggested to follow such a pattern, but few studies have tested this assertion directly. The present study investigated the relationship between KIBRA alleles (T carriers vs. CC homozygotes), cognitive performance, and brain volumes in three groups of cognitively healthy adults-middle aged (ages 52-64, n = 38), young old (ages 65-72, n = 45), and older old (ages 73-92, n = 62)-who were carefully matched on potentially confounding variables including apolipoprotein ε4 status and hypertension. Consistent with our prediction, T carriers maintained verbal memory performance with increasing age while CC homozygotes declined. Voxel-based morphometric analysis of magnetic resonance images showed an advantage for T carriers in frontal white matter volume that increased with age. Focusing on the older old group, this advantage for T carriers was also evident in left lingual gyrus gray matter and several additional frontal white matter regions. Contrary to expectations, neither KIBRA nor the interaction between KIBRA and age predicted hippocampal volumes. None of the brain regions investigated showed a CC homozygote advantage. Taken together, these data suggest that KIBRA results in decreased verbal memory performance and lower brain volumes in CC homozygotes compared to T carriers, particularly among the oldest old, consistent with the resource modulation hypothesis.
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Affiliation(s)
- Ariana Stickel
- Cognition and Neuroimaging Laboratory, Department of Psychology, University of Arizona, Tucson, AZ, United States
| | - Kevin Kawa
- Cognition and Neuroimaging Laboratory, Department of Psychology, University of Arizona, Tucson, AZ, United States
| | - Katrin Walther
- Epilepsy Center Erlangen, Department of Neurology, University Hospital Erlangen, Erlangen, Germany
| | - Elizabeth Glisky
- Aging and Cognition Laboratory, Department of Psychology, University of Arizona, Tucson, AZ, United States
| | - Ryan Richholt
- Neurogenomics Division, The Translational Genomics Research Institute, Phoenix, AZ, United States
| | - Matt Huentelman
- Neurogenomics Division, The Translational Genomics Research Institute, Phoenix, AZ, United States
| | - Lee Ryan
- Cognition and Neuroimaging Laboratory, Department of Psychology, University of Arizona, Tucson, AZ, United States
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26
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Perri RL, Di Russo F. Executive Functions and Performance Variability Measured by Event-Related Potentials to Understand the Neural Bases of Perceptual Decision-Making. Front Hum Neurosci 2017; 11:556. [PMID: 29187818 PMCID: PMC5694828 DOI: 10.3389/fnhum.2017.00556] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Accepted: 11/01/2017] [Indexed: 01/25/2023] Open
Affiliation(s)
- Rinaldo L Perri
- Department Unicusano, University Niccolò Cusano, Rome, Italy.,Department of Movement, Human and Health Sciences, Foro Italico University of Rome, Rome, Italy
| | - Francesco Di Russo
- Department of Movement, Human and Health Sciences, Foro Italico University of Rome, Rome, Italy.,IRCCS Santa Lucia Foundation, Rome, Italy
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27
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Haynes BI, Bunce D, Kochan NA, Wen W, Brodaty H, Sachdev PS. Associations between reaction time measures and white matter hyperintensities in very old age. Neuropsychologia 2017; 96:249-255. [PMID: 28115193 DOI: 10.1016/j.neuropsychologia.2017.01.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Revised: 12/23/2016] [Accepted: 01/20/2017] [Indexed: 10/20/2022]
Abstract
In old age, a relationship has been reported between intraindividual variability (IIV) in reaction time and white matter integrity as evidenced by white matter hyperintensities (WMH). However, it is unclear how far such associations are due to incipient neurodegenerative pathology in the samples investigated. The present study examined the relationship between IIV and WMH in older individuals (N=526) drawn from the Sydney Memory and Ageing Study. Using a complex reaction time (RT) task, greater IIV and mean-RT were related to a higher WMH burden in the frontal lobe. Critically, significant associations remained having taken future dementia into account suggesting that they were not explained by incipient dementia. Additionally, independent measures of executive function accounted for the association between RT metrics and WHM. The results are consistent with the view that frontally-supported cognitive processes are involved in IIV-WMH relations, and that RT measures are sensitive to compromise in white matter structures in non-demented older individuals.
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Affiliation(s)
- Becky I Haynes
- School of Psychology, Faculty of Medicine and Health, University of Leeds, Leeds, UK
| | - David Bunce
- School of Psychology, Faculty of Medicine and Health, University of Leeds, Leeds, UK; Centre for Health Brain Ageing (CHeBA), School of Psychiatry, Faculty of Medicine, University of New South Wales, Sydney, Australia.
| | - Nicole A Kochan
- Centre for Health Brain Ageing (CHeBA), School of Psychiatry, Faculty of Medicine, University of New South Wales, Sydney, Australia; Neuropsychiatric Institute, Prince of Wales Hospital, Barker Street, Randwick, NSW 2031, Australia
| | - Wei Wen
- Centre for Health Brain Ageing (CHeBA), School of Psychiatry, Faculty of Medicine, University of New South Wales, Sydney, Australia; Neuropsychiatric Institute, Prince of Wales Hospital, Barker Street, Randwick, NSW 2031, Australia
| | - Henry Brodaty
- Centre for Health Brain Ageing (CHeBA), School of Psychiatry, Faculty of Medicine, University of New South Wales, Sydney, Australia; Dementia Collaborative Research Centre, School of Psychiatry, UNSW Medicine, The University of New South Wales, Sydney, NSW 2052, Australia; Academic Department for Old Age Psychiatry, Prince of Wales Hospital, Avoca Street, Randwick, NSW 2031, Australia
| | - Perminder S Sachdev
- Centre for Health Brain Ageing (CHeBA), School of Psychiatry, Faculty of Medicine, University of New South Wales, Sydney, Australia; Neuropsychiatric Institute, Prince of Wales Hospital, Barker Street, Randwick, NSW 2031, Australia
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28
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Kievit RA, Davis SW, Griffiths J, Correia MM, Cam-Can, Henson RN. A watershed model of individual differences in fluid intelligence. Neuropsychologia 2016; 91:186-198. [PMID: 27520470 PMCID: PMC5081064 DOI: 10.1016/j.neuropsychologia.2016.08.008] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Revised: 06/23/2016] [Accepted: 08/09/2016] [Indexed: 12/14/2022]
Abstract
Fluid intelligence is a crucial cognitive ability that predicts key life outcomes across the lifespan. Strong empirical links exist between fluid intelligence and processing speed on the one hand, and white matter integrity and processing speed on the other. We propose a watershed model that integrates these three explanatory levels in a principled manner in a single statistical model, with processing speed and white matter figuring as intermediate endophenotypes. We fit this model in a large (N=555) adult lifespan cohort from the Cambridge Centre for Ageing and Neuroscience (Cam-CAN) using multiple measures of processing speed, white matter health and fluid intelligence. The model fit the data well, outperforming competing models and providing evidence for a many-to-one mapping between white matter integrity, processing speed and fluid intelligence. The model can be naturally extended to integrate other cognitive domains, endophenotypes and genotypes.
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Affiliation(s)
- Rogier A Kievit
- MRC Cognition and Brain Sciences Unit, 15 Chaucer Rd, Cambridge CB2 7EF, United Kingdom.
| | - Simon W Davis
- Department of Psychology, University of Cambridge, Downing Street, Cambridge CB2 3EB, United Kingdom; Center for Cognitive Neuroscience, Duke University, Durham, NC 27708, United States
| | - John Griffiths
- Department of Psychology, University of Cambridge, Downing Street, Cambridge CB2 3EB, United Kingdom; Rotman Research Institute, Baycrest, Toronto, Ontario, Canada M6A 2E1
| | - Marta M Correia
- MRC Cognition and Brain Sciences Unit, 15 Chaucer Rd, Cambridge CB2 7EF, United Kingdom
| | - Cam-Can
- Cambridge Centre for Ageing and Neuroscience (Cam-CAN), University of Cambridge and MRC Cognition and Brain Sciences Unit, Cambridge, United Kingdom
| | - Richard N Henson
- MRC Cognition and Brain Sciences Unit, 15 Chaucer Rd, Cambridge CB2 7EF, United Kingdom
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29
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Cognitive Aging in the Seattle Longitudinal Study: Within-Person Associations of Primary Mental Abilities with Psychomotor Speed and Cognitive Flexibility. J Intell 2016. [DOI: 10.3390/jintelligence4030012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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30
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Prefrontal Cortex Structure Predicts Training-Induced Improvements in Multitasking Performance. J Neurosci 2016; 36:2638-45. [PMID: 26937005 DOI: 10.1523/jneurosci.3410-15.2016] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
UNLABELLED The ability to perform multiple, concurrent tasks efficiently is a much-desired cognitive skill, but one that remains elusive due to the brain's inherent information-processing limitations. Multitasking performance can, however, be greatly improved through cognitive training (Van Selst et al., 1999, Dux et al., 2009). Previous studies have examined how patterns of brain activity change following training (for review, see Kelly and Garavan, 2005). Here, in a large-scale human behavioral and imaging study of 100 healthy adults, we tested whether multitasking training benefits, assessed using a standard dual-task paradigm, are associated with variability in brain structure. We found that the volume of the rostral part of the left dorsolateral prefrontal cortex (DLPFC) predicted an individual's response to training. Critically, this association was observed exclusively in a task-specific training group, and not in an active-training control group. Our findings reveal a link between DLPFC structure and an individual's propensity to gain from training on a task that taps the limits of cognitive control. SIGNIFICANCE STATEMENT Cognitive "brain" training is a rapidly growing, multibillion dollar industry (Hayden, 2012) that has been touted as the panacea for a variety of disorders that result in cognitive decline. A key process targeted by such training is "cognitive control." Here, we combined an established cognitive control measure, multitasking ability, with structural brain imaging in a sample of 100 participants. Our goal was to determine whether individual differences in brain structure predict the extent to which people derive measurable benefits from a cognitive training regime. Ours is the first study to identify a structural brain marker-volume of left hemisphere dorsolateral prefrontal cortex-associated with the magnitude of multitasking performance benefits induced by training at an individual level.
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31
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Baum S, Colonius H, Thelen A, Micheli C, Wallace M. Above the Mean: Examining Variability in Behavioral and Neural Responses to Multisensory Stimuli. Multisens Res 2016. [DOI: 10.1163/22134808-00002536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Even when experimental conditions are kept constant, a robust and consistent finding in both behavioral and neural experiments designed to examine multisensory processing is striking variability. Although this variability has often been considered uninteresting noise (a term that is laden with strong connotations), emerging work suggests that differences in variability may be an important aspect in describing differences in performance between individuals and groups. In the current review, derived from a symposium at the 2015 International Multisensory Research Forum in Pisa, Italy, we focus on several aspects of variability as it relates to multisensory function. This effort seeks to expand our understanding of variability at levels of coding and analysis ranging from the single neuron through large networks and on to behavioral processes, and encompasses a number of the multimodal approaches that are used to evaluate and characterize multisensory processing including single-unit neurophysiology, electroencephalography (EEG), functional magnetic resonance imaging (fMRI), and electrocorticography (ECoG).
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Affiliation(s)
- Sarah H. Baum
- Vanderbilt Brain Institute, Vanderbilt University, Nashville, TN, USA
| | - Hans Colonius
- Department of Cognitive Psychology, University of Oldenburg, Oldenburg, Germany
| | - Antonia Thelen
- Vanderbilt Brain Institute, Vanderbilt University, Nashville, TN, USA
| | - Cristiano Micheli
- Department of Psychology, Carl-von-Ossietzky University, Oldenburg, Germany
| | - Mark T. Wallace
- Vanderbilt Brain Institute, Vanderbilt University, Nashville, TN, USA
- Department of Hearing and Speech Sciences, Vanderbilt University, Nashville, TN, USA
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32
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The association between a history of concussion and variability in behavioral and neuroelectric indices of cognition. Int J Psychophysiol 2015; 98:426-34. [DOI: 10.1016/j.ijpsycho.2015.08.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Revised: 08/21/2015] [Accepted: 08/24/2015] [Indexed: 11/23/2022]
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33
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Abstract
Although aging is associated with clear declines in physical and cognitive processes, emotional functioning fares relatively well. Consistent with this behavioral profile, two core emotional brain regions, the amygdala and ventromedial prefrontal cortex, show little structural and functional decline in aging, compared with other regions. However, emotional processes depend on interacting systems of neurotransmitters and brain regions that go beyond these structures. This review examines how age-related brain changes influence processes such as attending to and remembering emotional stimuli, regulating emotion, and recognizing emotional expressions, as well as empathy, risk taking, impulsivity, behavior change, and attentional focus.
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Affiliation(s)
- Mara Mather
- Davis School of Gerontology, University of Southern California, Los Angeles, California 90089;
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34
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Tremblay P, Deschamps I. Structural brain aging and speech production: a surface-based brain morphometry study. Brain Struct Funct 2015; 221:3275-99. [PMID: 26336952 DOI: 10.1007/s00429-015-1100-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Accepted: 08/27/2015] [Indexed: 11/30/2022]
Abstract
While there has been a growing number of studies examining the neurofunctional correlates of speech production over the past decade, the neurostructural correlates of this immensely important human behaviour remain less well understood, despite the fact that previous studies have established links between brain structure and behaviour, including speech and language. In the present study, we thus examined, for the first time, the relationship between surface-based cortical thickness (CT) and three different behavioural indexes of sublexical speech production: response duration, reaction times and articulatory accuracy, in healthy young and older adults during the production of simple and complex meaningless sequences of syllables (e.g., /pa-pa-pa/ vs. /pa-ta-ka/). The results show that each behavioural speech measure was sensitive to the complexity of the sequences, as indicated by slower reaction times, longer response durations and decreased articulatory accuracy in both groups for the complex sequences. Older adults produced longer speech responses, particularly during the production of complex sequence. Unique age-independent and age-dependent relationships between brain structure and each of these behavioural measures were found in several cortical and subcortical regions known for their involvement in speech production, including the bilateral anterior insula, the left primary motor area, the rostral supramarginal gyrus, the right inferior frontal sulcus, the bilateral putamen and caudate, and in some region less typically associated with speech production, such as the posterior cingulate cortex.
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Affiliation(s)
- Pascale Tremblay
- Centre de Recherche de l'Institut Universitaire en Santé Mentale de Québec, Quebec, QC, Canada. .,Département de Réadaptation, Faculté de Médecine, Université Laval, Quebec, QC, Canada. .,Département de Rehabilitation, Université Laval, Office 4462, 1050 avenue de la Médecine, Quebec, QC, G1V 0A6, Canada.
| | - Isabelle Deschamps
- Centre de Recherche de l'Institut Universitaire en Santé Mentale de Québec, Quebec, QC, Canada.,Département de Réadaptation, Faculté de Médecine, Université Laval, Quebec, QC, Canada
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35
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Fellows RP, Schmitter-Edgecombe M. Between-domain cognitive dispersion and functional abilities in older adults. J Clin Exp Neuropsychol 2015; 37:1013-23. [PMID: 26300441 DOI: 10.1080/13803395.2015.1050360] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
OBJECTIVE Within-person variability in cognitive performance is related to neurological integrity, but the association with functional abilities is less clear. The primary aim of this study was to examine the association between cognitive dispersion, or within-person variability, and everyday multitasking and the way in which these variables may influence performance on a naturalistic assessment of functional abilities. METHOD Participants were 156 community-dwelling adults, age 50 or older. Cognitive dispersion was calculated by measuring within-person variability in cognitive domains, established through principal components analysis. Path analysis was used to determine the independent contribution of cognitive dispersion to functional ability, mediated by multitasking. RESULTS Results of the path analysis revealed that the number of subtasks interweaved (i.e., multitasked) mediated the association between cognitive dispersion and task sequencing and accuracy. Although increased multitasking was associated with worse task performance in the path model, secondary analyses revealed that for individuals with low cognitive dispersion, increased multitasking was associated with better task performance, whereas for those with higher levels of dispersion multitasking was negatively correlated with task performance. CONCLUSION These results suggest that cognitive dispersion between domains may be a useful indicator of multitasking and daily living skills among older adults.
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Affiliation(s)
- Robert P Fellows
- a Department of Psychology , Washington State University , Pullman , WA , USA
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36
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Tarnanas I, Papagiannopoulos S, Kazis D, Wiederhold M, Widerhold B, Tsolaki M. Reliability of a novel serious game using dual-task gait profiles to early characterize aMCI. Front Aging Neurosci 2015; 7:50. [PMID: 25954193 PMCID: PMC4406069 DOI: 10.3389/fnagi.2015.00050] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Accepted: 03/26/2015] [Indexed: 11/17/2022] Open
Abstract
Background: As the population of older adults is growing, the interest in a simple way to detect characterize amnestic mild cognitive impairment (aMCI), a prodromal stage of Alzheimer’s disease (AD), is becoming increasingly important. Serious game (SG) -based cognitive and motor performance profiles while performing everyday activities and dual-task walking (DTW) “motor signatures” are two very promising markers that can be detected in predementia states. We aim to compare the consistency, or conformity, of measurements made by a custom SG with DTW (NAV), a SG without DTW (DOT), neuropsychological measures and genotyping as markers for early detection of aMCI. Methods: The study population included three groups: early AD (n = 86), aMCI (n = 65), and healthy control subjects (n = 76), who completed the custom SG tasks in three separate sessions over a 3-month period. Outcome measures were neuropsychological data across-domain and within-domain intra-individual variability (IIV) and DOT and NAV latency-based and accuracy-based IIV. IIV reflects a transient, within-person change in behavioral performance, either during different cognitive domains (across-domain) or within the same domain (within-domain). Test–retest reliability of the DOT and NAV markers were assessed using an intraclass correlation (ICC) analysis. Results: Results indicated that performance data, such as the NAV latency-based and accuracy-based IIV, during the task displayed greater reliability across sessions compared to DOT. During the NAV task-engagement, the executive function, planning, and motor performance profiles exhibited moderate to good reliability (ICC = 0.6–0.8), while during DOT, executive function and spatial memory accuracy profiles exhibited fair to moderate reliability (ICC = 0.3–0.6). Additionally, reliability across tasks was more stable when three sessions were used in the ICC calculation relative to two sessions. Discussion: Our findings suggest that “motor signature” data during the NAV tasks were a more reliable marker for early diagnosis of aMCI than DOT. This result accentuates the importance of utilizing motor performance data as a metric for aMCI populations where memory decline is often the behavioral outcome of interest. In conclusion, custom SG with DTW performance data provide an ecological and reliable approach for cognitive assessment across multiple sessions and thus can be used as a useful tool for tracking longitudinal change in observational and interventional studies on aMCI.
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Affiliation(s)
- Ioannis Tarnanas
- 3rd Department of Neurology, Medical School, Aristotle University of Thessaloniki Thessaloniki, Greece
| | - Sotirios Papagiannopoulos
- 3rd Department of Neurology, Medical School, Aristotle University of Thessaloniki Thessaloniki, Greece
| | - Dimitris Kazis
- 3rd Department of Neurology, Medical School, Aristotle University of Thessaloniki Thessaloniki, Greece
| | - Mark Wiederhold
- Division of Cognitive and Restorative Neurology, Virtual Reality Medical Center San Diego, CA, USA
| | - Brenda Widerhold
- Virtual Reality Medical Institute, Brussels Life Sciences Incubator, Catholic University's Woluwe Campus Brussels, Belgium
| | - Magda Tsolaki
- 3rd Department of Neurology, Medical School, Aristotle University of Thessaloniki Thessaloniki, Greece
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37
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Haynes BI, Bunce D, Davies KA, Rusted JM. Increased Intraindividual Reaction Time Variability in Persons with Neuropsychiatric Manifestations of Systemic Lupus Erythematosus. Arch Clin Neuropsychol 2015; 30:271-9. [DOI: 10.1093/arclin/acv006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/28/2015] [Indexed: 11/12/2022] Open
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38
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Baum SH, Beauchamp MS. Greater BOLD variability in older compared with younger adults during audiovisual speech perception. PLoS One 2014; 9:e111121. [PMID: 25337918 PMCID: PMC4206517 DOI: 10.1371/journal.pone.0111121] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Accepted: 09/05/2014] [Indexed: 11/18/2022] Open
Abstract
Older adults exhibit decreased performance and increased trial-to-trial variability on a range of cognitive tasks, including speech perception. We used blood oxygen level dependent functional magnetic resonance imaging (BOLD fMRI) to search for neural correlates of these behavioral phenomena. We compared brain responses to simple speech stimuli (audiovisual syllables) in 24 healthy older adults (53 to 70 years old) and 14 younger adults (23 to 39 years old) using two independent analysis strategies: region-of-interest (ROI) and voxel-wise whole-brain analysis. While mean response amplitudes were moderately greater in younger adults, older adults had much greater within-subject variability. The greatly increased variability in older adults was observed for both individual voxels in the whole-brain analysis and for ROIs in the left superior temporal sulcus, the left auditory cortex, and the left visual cortex. Increased variability in older adults could not be attributed to differences in head movements between the groups. Increased neural variability may be related to the performance declines and increased behavioral variability that occur with aging.
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Affiliation(s)
- Sarah H. Baum
- Department of Neurobiology and Anatomy, University of Texas Medical School at Houston, Houston, Texas, United States of America
- Vanderbilt Brain Institute, Vanderbilt University, Nashville, Tennessee, United States of America
- * E-mail:
| | - Michael S. Beauchamp
- Department of Neurobiology and Anatomy, University of Texas Medical School at Houston, Houston, Texas, United States of America
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Zhou S, Kemp J, Després O, Pebayle T, Dufour A. The association between inhibition and pain tolerance in the elderly: Evidence from event-related potentials. Eur J Pain 2014; 19:669-76. [DOI: 10.1002/ejp.588] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/24/2014] [Indexed: 11/11/2022]
Affiliation(s)
- S. Zhou
- Laboratoire de Neurociences Cogntitives et Adaptatives; UMR 7364; CNRS; Université de Strasbourg; France
| | - J. Kemp
- Laboratoire de Neurociences Cogntitives et Adaptatives; UMR 7364; CNRS; Université de Strasbourg; France
| | - O. Després
- Laboratoire de Neurociences Cogntitives et Adaptatives; UMR 7364; CNRS; Université de Strasbourg; France
| | - T. Pebayle
- Centre d'Investigations Neurocognitives et Neurophysiologiques; UMS 3489; CNRS; Université de Strasbourg; France
| | - A. Dufour
- Laboratoire de Neurociences Cogntitives et Adaptatives; UMR 7364; CNRS; Université de Strasbourg; France
- Centre d'Investigations Neurocognitives et Neurophysiologiques; UMS 3489; CNRS; Université de Strasbourg; France
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Kälin AM, Pflüger M, Gietl AF, Riese F, Jäncke L, Nitsch RM, Hock C. Intraindividual variability across cognitive tasks as a potential marker for prodromal Alzheimer's disease. Front Aging Neurosci 2014; 6:147. [PMID: 25071556 PMCID: PMC4081834 DOI: 10.3389/fnagi.2014.00147] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Accepted: 06/16/2014] [Indexed: 01/09/2023] Open
Abstract
Recent studies have shown that increased cognitive intraindividual variability (IIV) across accuracy scores from tests representing different cognitive domains (across-domain IIV) might indicate prodromal Alzheimer’s disease (AD). Although IIV has been proposed to index cognitive control processes, IIV across accuracy scores from cognitive control tasks (within-domain IIV) has not been examined in healthy controls subjects (HCS), mild cognitive impairment (MCI), and AD patients in a single comparative study. This study examines the discriminative properties of within-domain IIV, and across-domain IIV in 149 HCS, 31 MCI, and 26 AD. Three tasks representing different cognitive domains were identified to calculate across-domain IIV. Three other tasks representing cognitive control were identified to calculate within-domain IIV. The intraindividual standard deviation was calculated across accuracy scores. To compare IIV between groups, ANCOVAs with the covariates age, gender, education, and mean performance were computed. IIV scores in general were higher in AD vs. HCS (p < 0.01). Only across-domain IIV was higher in AD vs. MCI (p = 0.001), and only within-domain IIV was higher in MCI vs. HCS (p = 0.05). Within-domain IIV may constitute a cognitive marker for the detection of prodromal AD at the MCI stage, whereas across-domain IIV may detect beginning AD at the MCI stage.
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Affiliation(s)
- Andrea M Kälin
- Division of Psychiatry Research and Psychogeriatric Medicine, University of Zurich, Zurich Switzerland
| | - Marlon Pflüger
- Department of Forensic Psychiatry, Psychiatric University Clinics, University of Basel, Basel Switzerland
| | - Anton F Gietl
- Division of Psychiatry Research and Psychogeriatric Medicine, University of Zurich, Zurich Switzerland
| | - Florian Riese
- Division of Psychiatry Research and Psychogeriatric Medicine, University of Zurich, Zurich Switzerland
| | - Lutz Jäncke
- Division of Neuropsychology, Institute of Psychology, University of Zurich, Zurich Switzerland ; International Normal Aging and Plasticity Imaging Center, University of Zurich, Zurich Switzerland ; University Research Priority Program "Dynamics of healthy aging", University of Zurich, Zurich Switzerland
| | - Roger M Nitsch
- Division of Psychiatry Research and Psychogeriatric Medicine, University of Zurich, Zurich Switzerland
| | - Christoph Hock
- Division of Psychiatry Research and Psychogeriatric Medicine, University of Zurich, Zurich Switzerland
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Costa AS, Tiffin-Richards FE, Holschbach B, Frank RD, Vassiliadou A, Krüger T, Eitner F, Gross T, Shah NJ, Schulz JB, Floege J, Reetz K. Clinical predictors of individual cognitive fluctuations in patients undergoing hemodialysis. Am J Kidney Dis 2014; 64:434-42. [PMID: 24679895 DOI: 10.1053/j.ajkd.2014.02.012] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2013] [Accepted: 02/04/2014] [Indexed: 11/11/2022]
Abstract
BACKGROUND Cognitive impairment in hemodialysis (HD) patients is frequent and mediated by several factors. It is unclear which patients are more susceptible to cognitive variations around the dialysis cycle and which clinical factors may play a mediator role. We aimed to answer these issues by investigating intraindividual changes within the dialysis cycle. STUDY DESIGN Cross-sectional observational study with repeated measures. SETTING & PARTICIPANTS 47 HD patients and 40 controls without kidney disease, both without history of neurologic disease. PREDICTORS Dialysis vintage, disease duration, vascular risk factors, comorbidity index score, intradialytic weight change, frequency of hypotensive episodes, and biochemical levels (hemoglobin, leukocytes, urea, creatinine, sodium, and potassium). Covariates included demographics (age, education, and sex). OUTCOMES & MEASUREMENTS Significant individual deterioration in attention and executive functions (phasic and intrinsic alertness, Stroop test, and Trail Making Test) after dialysis, as measured by a regression-based reliable change method. Regression models were used to identify clinical predictors of individual cognitive decline after dialysis. RESULTS After dialysis, patients primarily showed prolonged reaction times and psychomotor slowing. However, individual-based analyses revealed that fluctuations in attention and executive functions were present in only a minority of patients. Significant individual fluctuations on particular attention and executive tasks were associated moderately with intradialytic hypotensive episodes, as well as with psychoactive medication, and were predicted weakly by blood leukocyte count, sodium level, dialysis vintage, and volume. LIMITATIONS Small sample size; patient group younger and healthier than the overall HD population, limiting generalizability. CONCLUSIONS Only a minority of patients exhibit significant individual cognitive fluctuations, predominantly showing deterioration after dialysis in attention and executive functions. Susceptibility to such fluctuations was predicted in part by both HD-dependent and -independent factors.
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Affiliation(s)
- Ana S Costa
- Department of Neurology, Rheinisch-Westfaelische Technische Hochschule (RWTH) Aachen University Hospital, Aachen, Germany; Jülich Aachen Research Alliance (JARA)-Translational Brain Medicine, Aachen and Jülich, Germany
| | - Frances E Tiffin-Richards
- Department of Neurology, Rheinisch-Westfaelische Technische Hochschule (RWTH) Aachen University Hospital, Aachen, Germany; Jülich Aachen Research Alliance (JARA)-Translational Brain Medicine, Aachen and Jülich, Germany
| | - Bernhard Holschbach
- KfH Kuratorium für Dialyse und Nierentransplantation e.V., Stolberg, Germany
| | - Rolf D Frank
- Department of Internal Medicine, St.-Antonius-Hospital Eschweiler, Eschweiler, Germany
| | | | - Thilo Krüger
- Division of Nephrology and Clinical Immunology, RWTH Aachen University, Aachen, Germany
| | - Frank Eitner
- Division of Nephrology and Clinical Immunology, RWTH Aachen University, Aachen, Germany; Bayer Pharma AG, Global Drug Development, Kidney Diseases Research, Wuppertal, Germany
| | - Theresa Gross
- Division of Nephrology and Clinical Immunology, RWTH Aachen University, Aachen, Germany; Department of Internal Medicine, Dresden-Friedreichstadt Hospital, Dresden, Germany
| | - Nadim J Shah
- Department of Neurology, Rheinisch-Westfaelische Technische Hochschule (RWTH) Aachen University Hospital, Aachen, Germany; Jülich Aachen Research Alliance (JARA)-Translational Brain Medicine, Aachen and Jülich, Germany; Dialysezentrum Aachen Praxis und Dialyse, Aachen, Germany
| | - Jörg B Schulz
- Department of Neurology, Rheinisch-Westfaelische Technische Hochschule (RWTH) Aachen University Hospital, Aachen, Germany; Jülich Aachen Research Alliance (JARA)-Translational Brain Medicine, Aachen and Jülich, Germany
| | - Jürgen Floege
- Jülich Aachen Research Alliance (JARA)-Translational Brain Medicine, Aachen and Jülich, Germany; Division of Nephrology and Clinical Immunology, RWTH Aachen University, Aachen, Germany
| | - Kathrin Reetz
- Department of Neurology, Rheinisch-Westfaelische Technische Hochschule (RWTH) Aachen University Hospital, Aachen, Germany; Jülich Aachen Research Alliance (JARA)-Translational Brain Medicine, Aachen and Jülich, Germany; Institute of Neuroscience and Medicine (INM-4), Research Center Jülich GmbH, Jülich, Germany.
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42
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Antonenko D, Flöel A. Healthy aging by staying selectively connected: a mini-review. Gerontology 2013; 60:3-9. [PMID: 24080587 DOI: 10.1159/000354376] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2013] [Accepted: 07/15/2013] [Indexed: 11/19/2022] Open
Abstract
Cognitive neuroscience of the healthy aging human brain has thus far addressed age-related changes of local functional and structural properties of gray and white matter and their association with declining or preserved cognitive functions. In addition to these localized changes, recent neuroimaging research has attributed an important role to neural networks with a stronger focus on interacting rather than isolated brain regions. The analysis of functional connectivity encompasses task-dependent and -independent synchronous activity in the brain, and thus reflects the organization of the brain in distinct performance-relevant networks. Structural connectivity in white matter pathways, representing the integrity of anatomical connections, underlies the communication between the nodes of these functional networks. Both functional and structural connectivity within these networks have been demonstrated to change with aging, and to have different predictive values for cognitive abilities in older compared to young adults. Structural degeneration has been found in the entire cerebral white matter with greatest deterioration in frontal areas, affecting whole brain structural network efficiency. With regard to functional connectivity, both higher and lower functional coupling has been observed in the aging compared to the young brain. Here, high connectivity within the nodes of specific functional networks on the one hand, and low connectivity to regions outside this network on the other hand, were associated with preserved cognitive functions in aging in most cases. For example, in the language domain, connections between left-hemisphere language-related prefrontal, posterior temporal and parietal areas were described as beneficial, whereas connections between the left and right hemisphere were detrimental for language task performance. Of note, interactions between structural and functional network properties may change in the course of aging and differentially impact behavioral performance in older versus young adults. Finally, studies using noninvasive brain stimulation techniques like transcranial direct current stimulation (tDCS) to simultaneously modulate behavior and functional connectivity support the importance of 'selective connectivity' of aging brain networks for preserved cognitive functions. These studies demonstrate that enhancing task performance by tDCS is paralleled by increased connectivity within functional networks. In this review, we outline the network perspective on healthy brain aging and discuss recent developments in this field.
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Affiliation(s)
- Daria Antonenko
- Department of Neurology, NeuroCure Cluster of Excellence, and Center for Stroke Research Berlin, Charité-Universitätsmedizin Berlin, Berlin, Germany
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Hurks P, Hendriksen J, Dek J, Kooij A. Normal Variability of Children’s Scaled Scores on Subtests of the Dutch Wechsler Preschool and Primary scale of Intelligence – Third Edition. Clin Neuropsychol 2013; 27:988-1003. [DOI: 10.1080/13854046.2013.797502] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Herremans SC, Vanderhasselt MA, De Raedt R, Baeken C. Reduced intra-individual reaction time variability during a Go-NoGo task in detoxified alcohol-dependent patients after one right-sided dorsolateral prefrontal HF-rTMS session. Alcohol Alcohol 2013; 48:552-7. [PMID: 23709633 DOI: 10.1093/alcalc/agt054] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
AIMS As alcohol dependency is characterized by severe executive function deficits, we examined the influence of high-frequency (HF) repetitive transcranial magnetic stimulation (rTMS) applied to the right dorsolateral prefrontal cortex (DLPFC) on executive functioning in recently detoxified alcohol-dependent patients. METHODS In this randomized, single blind, sham (placebo)-controlled, crossover study, we included 50 detoxified alcohol-dependent patients. We examined the effect of a single right DLPFC HF-rTMS session on commission errors, mean reaction times (RTs) and intra-individual reaction time variability (IIRTV) during a Go-NoGo task (50% Go/50% NoGo condition) in 29 alcohol-dependent patients. Patients completed this cognitive task immediately before and immediately after the stimulation session. In order to avoid carry-over effects between stimulation sessions, a 1-week inter-session interval was respected. Because rTMS treatment has been shown to affect subjective craving, all patients were also assessed with the Obsessive Compulsive Drinking Scale (OCDS). RESULTS After both stimulation conditions, we observed a significant decrease of commission errors, without differences between active and sham HF-rTMS stimulation. No significant difference was observed between active and sham stimulation on mean RT. However, only active stimulation resulted in a significant decrease in IIRTV. No effects of stimulation were found for the craving measurements. CONCLUSION Our findings suggest that in recently detoxified alcohol-dependent patients, one right-sided HF-rTMS session stabilizes cognitive performance during executive control tasks, implying that active stimulation reduces patients' proneness to attentional lapses.
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Affiliation(s)
- S C Herremans
- Psychiatric Department, University Hospital, UZ Brussel, Vrije Universiteit Brussel (V.U.B.), Laarbeeklaan 101, 1090 Brussels, Belgium.
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Moore RD, Wu CT, Pontifex MB, O'Leary KC, Scudder MR, Raine LB, Johnson CR, Hillman CH. Aerobic fitness and intra-individual variability of neurocognition in preadolescent children. Brain Cogn 2013; 82:43-57. [PMID: 23511845 DOI: 10.1016/j.bandc.2013.02.006] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2012] [Revised: 01/12/2013] [Accepted: 02/04/2013] [Indexed: 10/27/2022]
Abstract
This study examined behavioral and neuroelectric intra-individual variability (IIV) in preadolescent children during a task requiring variable amounts of cognitive control. The current study further examined whether IIV was moderated by aerobic fitness level. Participants performed a modified flanker task, comprised of congruent and incongruent arrays, within compatible and incompatible stimulus-response conditions. Results revealed that congruent, relative to incongruent, conditions were associated with less IIV of RT. Further, less IIV of RT, P3 amplitude, and P3 latency was observed for the compatible relative to the incompatible condition. Higher fitness was associated with shorter and less variable RT only for the incompatible condition, with no fitness-related differences observed for P3 variability. The findings suggest that conditions requiring greater cognitive control are associated with increased IIV, and that higher fitness may be associated with greater integrity of cognitive control systems during development.
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Affiliation(s)
- Robert Davis Moore
- Department of Kinesiology and Community Health, University of Illinois at Urbana-Champaign, Illinois, United States
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