Disrupted Functional Connectivity in Dorsal and Ventral Attention Networks During Attention Orienting in Autism Spectrum Disorders / Jacqueline FITZGERALD in Autism Research, 8-2 (April 2015)  

Public ISBD [article]  inAutism Research > 8-2 (April 2015) . - p.136-152 Titre : Disrupted Functional Connectivity in Dorsal and Ventral Attention Networks During Attention Orienting in Autism Spectrum Disorders Type de document : texte imprimé Auteurs : Jacqueline FITZGERALD, Auteur ; Katherine JOHNSON, Auteur ; Elizabeth KEHOE, Auteur ; Arun L.W. BOKDE, Auteur ; Hugh GARAVAN, Auteur ; Louise GALLAGHER, Auteur ; Jane MCGRATH, Auteur Article en page(s) : p.136-152 Langues : Anglais (eng) Mots-clés : autism spectrum disorders  functional connectivity  attention orienting  attention network  neuroimaging Index. décimale : PER Périodiques Résumé : Background Attention orienting is a cognitive process that facilitates the movement of attention focus from one location to another: this may be impaired in autism spectrum disorder (ASD). Dorsal and ventral attention networks (DAN and VAN) sub-serve the process of attention orienting. This study investigated the functional connectivity of attention orienting in these networks in ASD using the Posner Cueing Task. Method Twenty-one adolescents with ASD and 21 age and IQ matched controls underwent functional magnetic resonance imaging. A psychophysical interaction (PPI) analysis was implemented to investigate task-dependent functional connectivity, measuring synchronicity of brain regions during the task. Regions of interest (ROI) were selected to explore functional connectivity in the DAN during cue-only conditions and in the VAN during invalid and valid trials. Results Behaviourally, the ASD and control groups performed the task in a similar manner. Functional MRI results indicated that the ASD and control groups activated similar brain regions. During invalid trials (VAN), the ASD group showed significant positive functional connectivity to multiple brain regions, whilst the control group demonstrated negative connectivity. During valid trials (VAN), the two groups also showed contrasting patterns of connectivity. In the cue-only conditions (DAN), the ASD group showed weaker functional connectivity. Conclusion The DAN analysis suggests that the ASD group has weaker coherence between brain areas involved in goal-driven, endogenous attention control. The strong positive functional connectivity exhibited by the ASD group in the VAN during the invalid trials suggests that individuals with ASD may generate compensatory mechanisms to achieve neurotypical behaviour. These results support the theory of abnormal cortical connectivity in autism. En ligne : http://dx.doi.org/10.1002/aur.1430 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=256 [article] Disrupted Functional Connectivity in Dorsal and Ventral Attention Networks During Attention Orienting in Autism Spectrum Disorders [texte imprimé] / Jacqueline FITZGERALD, Auteur ; Katherine JOHNSON, Auteur ; Elizabeth KEHOE, Auteur ; Arun L.W. BOKDE, Auteur ; Hugh GARAVAN, Auteur ; Louise GALLAGHER, Auteur ; Jane MCGRATH, Auteur . - p.136-152. Langues : Anglais (eng) in Autism Research > 8-2 (April 2015) . - p.136-152 Mots-clés : autism spectrum disorders  functional connectivity  attention orienting  attention network  neuroimaging Index. décimale : PER Périodiques Résumé : Background Attention orienting is a cognitive process that facilitates the movement of attention focus from one location to another: this may be impaired in autism spectrum disorder (ASD). Dorsal and ventral attention networks (DAN and VAN) sub-serve the process of attention orienting. This study investigated the functional connectivity of attention orienting in these networks in ASD using the Posner Cueing Task. Method Twenty-one adolescents with ASD and 21 age and IQ matched controls underwent functional magnetic resonance imaging. A psychophysical interaction (PPI) analysis was implemented to investigate task-dependent functional connectivity, measuring synchronicity of brain regions during the task. Regions of interest (ROI) were selected to explore functional connectivity in the DAN during cue-only conditions and in the VAN during invalid and valid trials. Results Behaviourally, the ASD and control groups performed the task in a similar manner. Functional MRI results indicated that the ASD and control groups activated similar brain regions. During invalid trials (VAN), the ASD group showed significant positive functional connectivity to multiple brain regions, whilst the control group demonstrated negative connectivity. During valid trials (VAN), the two groups also showed contrasting patterns of connectivity. In the cue-only conditions (DAN), the ASD group showed weaker functional connectivity. Conclusion The DAN analysis suggests that the ASD group has weaker coherence between brain areas involved in goal-driven, endogenous attention control. The strong positive functional connectivity exhibited by the ASD group in the VAN during the invalid trials suggests that individuals with ASD may generate compensatory mechanisms to achieve neurotypical behaviour. These results support the theory of abnormal cortical connectivity in autism. En ligne : http://dx.doi.org/10.1002/aur.1430 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=256

Evidence of neurocognitive and resting state functional connectivity differences in carriers of NRXN1 deletions / Jacqueline FITZGERALD in Journal of Neurodevelopmental Disorders, 17 (2025)  

Public ISBD [article]  inJournal of Neurodevelopmental Disorders > 17 (2025) Titre : Evidence of neurocognitive and resting state functional connectivity differences in carriers of NRXN1 deletions Type de document : texte imprimé Auteurs : Jacqueline FITZGERALD, Auteur ; Ciara J. MOLLOY, Auteur ; Thomas DINNEEN, Auteur ; Niamh E. FEERICK, Auteur ; Matthew O'SULLIVAN, Auteur ; Richard O'CONAILL, Auteur ; Maryam AL-SHEHHI, Auteur ; Richard REILLY, Auteur ; Sally Ann LYNCH, Auteur ; Eleisa A. HERON, Auteur ; Clare KELLY, Auteur ; Sanbing SHEN, Auteur ; Louise GALLAGHER, Auteur Langues : Anglais (eng) Mots-clés : Humans  Female  Male  Magnetic Resonance Imaging  Adult  Young Adult  Calcium-Binding Proteins/genetics  Diffusion Tensor Imaging  Brain/diagnostic imaging/physiopathology  Neural Cell Adhesion Molecules/genetics  Adolescent  Cell Adhesion Molecules, Neuronal/genetics  Cognition/physiology  Neuropsychological Tests  Gene Deletion  Neural Pathways/diagnostic imaging/physiopathology  Executive Function/physiology  Cognition  Copy number variant  NRXN1 deletion  Neuroimaging  the study was obtained from St. James’s Hospital/Tallaght University Hospital  Research Ethics Committee (REC reference: 2015/03/01). Participants over 18 years  provided written consent and parental written consent was provided for those  under 18 years. Consent for publication: All authors who contributed to the  article have approved the submitted version. Competing interests: The authors  declare no competing interests. Index. décimale : PER Périodiques Résumé : BACKGROUND: NRXN1 deletion (NRXN1 del) is a rare copy number variant associated with several neurodevelopmental, neuropsychiatric, and cognitive outcomes. The NRXN1 gene encodes for a pre-synaptic cell adhesion molecule that is important for synapse formation, regulation and neurotransmission. We used a gene-first approach to investigate neurocognitive and brain phenotypes in NRXN1 del carriers. METHODS: Forty-two participants (21 NRXN1 del carriers and 21 neurotypical age and sex-matched comparisons) completed IQ assessments, and a neurocognitive battery, including, executive function, attention, and social cognition tasks. Magnetic resonance imaging (MRI) data, including T1-weighted anatomical scans, resting state functional MRI and diffusion tensor imaging, were acquired in 36 participants (17 NRXN1 del carriers and 19 comparisons). RESULTS: NRXN1 del carriers had lower mean IQ and poorer spatial working memory performance compared to comparisons (p ≤ 0.05). Neuroimaging results revealed group differences in visual and ventral attention resting state networks (p < 0.05). Network-based statistical analysis showed a significant effect of group status for 28/115 connections, with poorer segregation between visual and default networks in NRXN1 del carriers relative to comparisons. No differences in brain structural volume or cortical thickness, or diffusion measures of white matter structural architecture were observed between groups. CONCLUSIONS: This exploratory study provides evidence for neurocognitive impacts and brain functional differences related to underlying synaptic mechanisms. Brain functional differences in NRXN1 del carriers may support altered excitation/inhibition dynamics within the brain. Gene-first approaches may establish brain-based translational markers to identify neurobiologically informed subgroups within neurodevelopmental and neuropsychiatric conditions, and ultimately transdiagnostic therapeutic strategies. En ligne : https://dx.doi.org/10.1186/s11689-025-09625-5 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=576 [article] Evidence of neurocognitive and resting state functional connectivity differences in carriers of NRXN1 deletions [texte imprimé] / Jacqueline FITZGERALD, Auteur ; Ciara J. MOLLOY, Auteur ; Thomas DINNEEN, Auteur ; Niamh E. FEERICK, Auteur ; Matthew O'SULLIVAN, Auteur ; Richard O'CONAILL, Auteur ; Maryam AL-SHEHHI, Auteur ; Richard REILLY, Auteur ; Sally Ann LYNCH, Auteur ; Eleisa A. HERON, Auteur ; Clare KELLY, Auteur ; Sanbing SHEN, Auteur ; Louise GALLAGHER, Auteur. Langues : Anglais (eng) in Journal of Neurodevelopmental Disorders > 17 (2025) Mots-clés : Humans  Female  Male  Magnetic Resonance Imaging  Adult  Young Adult  Calcium-Binding Proteins/genetics  Diffusion Tensor Imaging  Brain/diagnostic imaging/physiopathology  Neural Cell Adhesion Molecules/genetics  Adolescent  Cell Adhesion Molecules, Neuronal/genetics  Cognition/physiology  Neuropsychological Tests  Gene Deletion  Neural Pathways/diagnostic imaging/physiopathology  Executive Function/physiology  Cognition  Copy number variant  NRXN1 deletion  Neuroimaging  the study was obtained from St. James’s Hospital/Tallaght University Hospital  Research Ethics Committee (REC reference: 2015/03/01). Participants over 18 years  provided written consent and parental written consent was provided for those  under 18 years. Consent for publication: All authors who contributed to the  article have approved the submitted version. Competing interests: The authors  declare no competing interests. Index. décimale : PER Périodiques Résumé : BACKGROUND: NRXN1 deletion (NRXN1 del) is a rare copy number variant associated with several neurodevelopmental, neuropsychiatric, and cognitive outcomes. The NRXN1 gene encodes for a pre-synaptic cell adhesion molecule that is important for synapse formation, regulation and neurotransmission. We used a gene-first approach to investigate neurocognitive and brain phenotypes in NRXN1 del carriers. METHODS: Forty-two participants (21 NRXN1 del carriers and 21 neurotypical age and sex-matched comparisons) completed IQ assessments, and a neurocognitive battery, including, executive function, attention, and social cognition tasks. Magnetic resonance imaging (MRI) data, including T1-weighted anatomical scans, resting state functional MRI and diffusion tensor imaging, were acquired in 36 participants (17 NRXN1 del carriers and 19 comparisons). RESULTS: NRXN1 del carriers had lower mean IQ and poorer spatial working memory performance compared to comparisons (p ≤ 0.05). Neuroimaging results revealed group differences in visual and ventral attention resting state networks (p < 0.05). Network-based statistical analysis showed a significant effect of group status for 28/115 connections, with poorer segregation between visual and default networks in NRXN1 del carriers relative to comparisons. No differences in brain structural volume or cortical thickness, or diffusion measures of white matter structural architecture were observed between groups. CONCLUSIONS: This exploratory study provides evidence for neurocognitive impacts and brain functional differences related to underlying synaptic mechanisms. Brain functional differences in NRXN1 del carriers may support altered excitation/inhibition dynamics within the brain. Gene-first approaches may establish brain-based translational markers to identify neurobiologically informed subgroups within neurodevelopmental and neuropsychiatric conditions, and ultimately transdiagnostic therapeutic strategies. En ligne : https://dx.doi.org/10.1186/s11689-025-09625-5 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=576

Increased Ca(2+) signaling in NRXN1alpha (+/-) neurons derived from ASD induced pluripotent stem cells / Sahar AVAZZADEH in Molecular Autism, 10 (2019)  

Public ISBD [article]  inMolecular Autism > 10 (2019) . - 52 p. Titre : Increased Ca(2+) signaling in NRXN1alpha (+/-) neurons derived from ASD induced pluripotent stem cells Type de document : texte imprimé Auteurs : Sahar AVAZZADEH, Auteur ; Katya MCDONAGH, Auteur ; Jamie REILLY, Auteur ; Yao WANG, Auteur ; Stephanie D. BOOMKAMP, Auteur ; Veronica MCINERNEY, Auteur ; Janusz KRAWCZYK, Auteur ; Jacqueline FITZGERALD, Auteur ; Niamh FEERICK, Auteur ; Matthew O'SULLIVAN, Auteur ; Amirhossein JALALI, Auteur ; Eva B. FORMAN, Auteur ; Sally A. LYNCH, Auteur ; Sean ENNIS, Auteur ; Nele COSEMANS, Auteur ; Hilde PEETERS, Auteur ; Peter DOCKERY, Auteur ; Timothy O'BRIEN, Auteur ; Leo R. QUINLAN, Auteur ; Louise GALLAGHER, Auteur ; Sanbing SHEN, Auteur Article en page(s) : 52 p. Langues : Anglais (eng) Mots-clés : Autism  Calcium signaling  Induced pluripotent stem cells  NRXN1alpha  Neurons  Transcriptome Index. décimale : PER Périodiques Résumé : Background: Autism spectrum disorder (ASD) is a neurodevelopmental disorder with a high co-morbidity of epilepsy and associated with hundreds of rare risk factors. NRXN1 deletion is among the commonest rare genetic factors shared by ASD, schizophrenia, intellectual disability, epilepsy, and developmental delay. However, how NRXN1 deletions lead to different clinical symptoms is unknown. Patient-derived cells are essential to investigate the functional consequences of NRXN1 lesions to human neurons in different diseases. Methods: Skin biopsies were donated by five healthy donors and three ASD patients carrying NRXN1alpha (+/-) deletions. Seven control and six NRXN1alpha (+/-) iPSC lines were derived and differentiated into day 100 cortical excitatory neurons using dual SMAD inhibition. Calcium (Ca(2+)) imaging was performed using Fluo4-AM, and the properties of Ca(2+) transients were compared between two groups of neurons. Transcriptome analysis was carried out to undercover molecular pathways associated with NRXN1alpha (+/-) neurons. Results: NRXN1alpha (+/-) neurons were found to display altered calcium dynamics, with significantly increased frequency, duration, and amplitude of Ca(2+) transients. Whole genome RNA sequencing also revealed altered ion transport and transporter activity, with upregulated voltage-gated calcium channels as one of the most significant pathways in NRXN1alpha (+/-) neurons identified by STRING and GSEA analyses. Conclusions: This is the first report to show that human NRXN1alpha (+/-) neurons derived from ASD patients' iPSCs present novel phenotypes of upregulated VGCCs and increased Ca(2+) transients, which may facilitate the development of drug screening assays for the treatment of ASD. En ligne : http://dx.doi.org/10.1186/s13229-019-0303-3 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=414 [article] Increased Ca(2+) signaling in NRXN1alpha (+/-) neurons derived from ASD induced pluripotent stem cells [texte imprimé] / Sahar AVAZZADEH, Auteur ; Katya MCDONAGH, Auteur ; Jamie REILLY, Auteur ; Yao WANG, Auteur ; Stephanie D. BOOMKAMP, Auteur ; Veronica MCINERNEY, Auteur ; Janusz KRAWCZYK, Auteur ; Jacqueline FITZGERALD, Auteur ; Niamh FEERICK, Auteur ; Matthew O'SULLIVAN, Auteur ; Amirhossein JALALI, Auteur ; Eva B. FORMAN, Auteur ; Sally A. LYNCH, Auteur ; Sean ENNIS, Auteur ; Nele COSEMANS, Auteur ; Hilde PEETERS, Auteur ; Peter DOCKERY, Auteur ; Timothy O'BRIEN, Auteur ; Leo R. QUINLAN, Auteur ; Louise GALLAGHER, Auteur ; Sanbing SHEN, Auteur . - 52 p. Langues : Anglais (eng) in Molecular Autism > 10 (2019) . - 52 p. Mots-clés : Autism  Calcium signaling  Induced pluripotent stem cells  NRXN1alpha  Neurons  Transcriptome Index. décimale : PER Périodiques Résumé : Background: Autism spectrum disorder (ASD) is a neurodevelopmental disorder with a high co-morbidity of epilepsy and associated with hundreds of rare risk factors. NRXN1 deletion is among the commonest rare genetic factors shared by ASD, schizophrenia, intellectual disability, epilepsy, and developmental delay. However, how NRXN1 deletions lead to different clinical symptoms is unknown. Patient-derived cells are essential to investigate the functional consequences of NRXN1 lesions to human neurons in different diseases. Methods: Skin biopsies were donated by five healthy donors and three ASD patients carrying NRXN1alpha (+/-) deletions. Seven control and six NRXN1alpha (+/-) iPSC lines were derived and differentiated into day 100 cortical excitatory neurons using dual SMAD inhibition. Calcium (Ca(2+)) imaging was performed using Fluo4-AM, and the properties of Ca(2+) transients were compared between two groups of neurons. Transcriptome analysis was carried out to undercover molecular pathways associated with NRXN1alpha (+/-) neurons. Results: NRXN1alpha (+/-) neurons were found to display altered calcium dynamics, with significantly increased frequency, duration, and amplitude of Ca(2+) transients. Whole genome RNA sequencing also revealed altered ion transport and transporter activity, with upregulated voltage-gated calcium channels as one of the most significant pathways in NRXN1alpha (+/-) neurons identified by STRING and GSEA analyses. Conclusions: This is the first report to show that human NRXN1alpha (+/-) neurons derived from ASD patients' iPSCs present novel phenotypes of upregulated VGCCs and increased Ca(2+) transients, which may facilitate the development of drug screening assays for the treatment of ASD. En ligne : http://dx.doi.org/10.1186/s13229-019-0303-3 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=414

Social and monetary reward processing in autism spectrum disorders / Sonja DELMONTE in Molecular Autism, (September 2012)  

Public ISBD [article]  inMolecular Autism > (September 2012) . - 13 p. Titre : Social and monetary reward processing in autism spectrum disorders Type de document : texte imprimé Auteurs : Sonja DELMONTE, Auteur ; Joshua H. BALSTERS, Auteur ; Jane MCGRATH, Auteur ; Jacqueline FITZGERALD, Auteur ; Sean BRENNAN, Auteur ; Andrew J. FAGAN, Auteur ; Louise GALLAGHER, Auteur Année de publication : 2012 Article en page(s) : 13 p. Langues : Anglais (eng) Mots-clés : Autism  Reward  Social motivation  Striatum  Functional magnetic resonance imaging  fMRI Index. décimale : PER Périodiques Résumé : Background Social motivation theory suggests that deficits in social reward processing underlie social impairments in autism spectrum disorders (ASD). However, the extent to which abnormalities in reward processing generalize to other classes of stimuli remains unresolved. The aim of the current study was to examine if reward processing abnormalities in ASD are specific to social stimuli or can be generalized to other classes of reward. Additionally, we sought to examine the results in the light of behavioral impairments in ASD. Methods Participants performed adapted versions of the social and monetary incentive delay tasks. Data from 21 unmedicated right-handed male participants with ASD and 21 age- and IQ-matched controls were analyzed using a factorial design to examine the blood-oxygen-level-dependent (BOLD) response during the anticipation and receipt of both reward types. Results Behaviorally, the ASD group showed less of a reduction in reaction time (RT) for rewarded compared to unrewarded trials than the control group. In terms of the fMRI results, there were no significant group differences in reward circuitry during reward anticipation. During the receipt of rewards, there was a significant interaction between group and reward type in the left dorsal striatum (DS). The ASD group showed reduced activity in the DS compared to controls for social rewards but not monetary rewards and decreased activation for social rewards compared to monetary rewards. Controls showed no significant difference between the two reward types. Increased activation in the DS during social reward processing was associated with faster response times for rewarded trials, compared to unrewarded trials, in both groups. This is in line with behavioral results indicating that the ASD group showed less of a reduction in RT for rewarded compared to unrewarded trials. Additionally, de-activation to social rewards was associated with increased repetitive behavior in ASD. Conclusions In line with social motivation theory, the ASD group showed reduced activation, compared to controls, during the receipt of social rewards in the DS. Groups did not differ significantly during the processing of monetary rewards. BOLD activation in the DS, during social reward processing, was associated with behavioral impairments in ASD. En ligne : http://dx.doi.org/10.1186/2040-2392-3-7 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=201 [article] Social and monetary reward processing in autism spectrum disorders [texte imprimé] / Sonja DELMONTE, Auteur ; Joshua H. BALSTERS, Auteur ; Jane MCGRATH, Auteur ; Jacqueline FITZGERALD, Auteur ; Sean BRENNAN, Auteur ; Andrew J. FAGAN, Auteur ; Louise GALLAGHER, Auteur . - 2012 . - 13 p. Langues : Anglais (eng) in Molecular Autism > (September 2012) . - 13 p. Mots-clés : Autism  Reward  Social motivation  Striatum  Functional magnetic resonance imaging  fMRI Index. décimale : PER Périodiques Résumé : Background Social motivation theory suggests that deficits in social reward processing underlie social impairments in autism spectrum disorders (ASD). However, the extent to which abnormalities in reward processing generalize to other classes of stimuli remains unresolved. The aim of the current study was to examine if reward processing abnormalities in ASD are specific to social stimuli or can be generalized to other classes of reward. Additionally, we sought to examine the results in the light of behavioral impairments in ASD. Methods Participants performed adapted versions of the social and monetary incentive delay tasks. Data from 21 unmedicated right-handed male participants with ASD and 21 age- and IQ-matched controls were analyzed using a factorial design to examine the blood-oxygen-level-dependent (BOLD) response during the anticipation and receipt of both reward types. Results Behaviorally, the ASD group showed less of a reduction in reaction time (RT) for rewarded compared to unrewarded trials than the control group. In terms of the fMRI results, there were no significant group differences in reward circuitry during reward anticipation. During the receipt of rewards, there was a significant interaction between group and reward type in the left dorsal striatum (DS). The ASD group showed reduced activity in the DS compared to controls for social rewards but not monetary rewards and decreased activation for social rewards compared to monetary rewards. Controls showed no significant difference between the two reward types. Increased activation in the DS during social reward processing was associated with faster response times for rewarded trials, compared to unrewarded trials, in both groups. This is in line with behavioral results indicating that the ASD group showed less of a reduction in RT for rewarded compared to unrewarded trials. Additionally, de-activation to social rewards was associated with increased repetitive behavior in ASD. Conclusions In line with social motivation theory, the ASD group showed reduced activation, compared to controls, during the receipt of social rewards in the DS. Groups did not differ significantly during the processing of monetary rewards. BOLD activation in the DS, during social reward processing, was associated with behavioral impairments in ASD. En ligne : http://dx.doi.org/10.1186/2040-2392-3-7 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=201

Widespread Disrupted White Matter Microstructure in Autism Spectrum Disorders / Jacqueline FITZGERALD in Journal of Autism and Developmental Disorders, 49-7 (July 2019)  

Public ISBD [article]  inJournal of Autism and Developmental Disorders > 49-7 (July 2019) . - p.2664-2674 Titre : Widespread Disrupted White Matter Microstructure in Autism Spectrum Disorders Type de document : texte imprimé Auteurs : Jacqueline FITZGERALD, Auteur ; Louise GALLAGHER, Auteur ; Jane MCGRATH, Auteur Article en page(s) : p.2664-2674 Langues : Anglais (eng) Mots-clés : Autism spectrum disorders  Dti  Diffusion imaging  Fractional anisotropy  Structural connectivity  Tbss Index. décimale : PER Périodiques Résumé : Autism Spectrum Disorders (ASDs) are characterised by impaired social communication and restricted repetitive behaviours. Researchers posit that these core features may be underpinned by disrupted structural connectivity. A tract based spatial statistical analysis of diffusion MRI data was performed to investigate white matter organisation (an indication of structural connectivity) in a well-defined cohort of 45 ASD and 45 age and IQ matched control participants. Aberrant structural connectivity characterised by reduced fractional anisotropy was observed in several fiber pathways in ASD relative to controls. Disrupted white matter organisation was associated with social deficits and restricted repetitive behaviours in ASD. Abnormal structural connectivity is apparent in ASD and may be linked to the core behavioural features of the disorder. En ligne : http://dx.doi.org/10.1007/s10803-016-2803-8 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=401 [article] Widespread Disrupted White Matter Microstructure in Autism Spectrum Disorders [texte imprimé] / Jacqueline FITZGERALD, Auteur ; Louise GALLAGHER, Auteur ; Jane MCGRATH, Auteur . - p.2664-2674. Langues : Anglais (eng) in Journal of Autism and Developmental Disorders > 49-7 (July 2019) . - p.2664-2674 Mots-clés : Autism spectrum disorders  Dti  Diffusion imaging  Fractional anisotropy  Structural connectivity  Tbss Index. décimale : PER Périodiques Résumé : Autism Spectrum Disorders (ASDs) are characterised by impaired social communication and restricted repetitive behaviours. Researchers posit that these core features may be underpinned by disrupted structural connectivity. A tract based spatial statistical analysis of diffusion MRI data was performed to investigate white matter organisation (an indication of structural connectivity) in a well-defined cohort of 45 ASD and 45 age and IQ matched control participants. Aberrant structural connectivity characterised by reduced fractional anisotropy was observed in several fiber pathways in ASD relative to controls. Disrupted white matter organisation was associated with social deficits and restricted repetitive behaviours in ASD. Abnormal structural connectivity is apparent in ASD and may be linked to the core behavioural features of the disorder. En ligne : http://dx.doi.org/10.1007/s10803-016-2803-8 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=401

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