Atypical Visuospatial Processing in Autism: Insights from Functional Connectivity Analysis / Jane MCGRATH in Autism Research, 5-5 (October 2012)  

Public ISBD [article]  inAutism Research > 5-5 (October 2012) . - p.314-330 Titre : Atypical Visuospatial Processing in Autism: Insights from Functional Connectivity Analysis Type de document : Texte imprimé et/ou numérique Auteurs : Jane MCGRATH, Auteur ; Katherine A. JOHNSON, Auteur ; Christine ECKER, Auteur ; Erik O'HANLON, Auteur ; Michael GILL, Auteur ; Louise GALLAGHER, Auteur ; Hugh GARAVAN, Auteur Article en page(s) : p.314-330 Langues : Anglais (eng) Mots-clés : autism  functional MRI  visuospatial processing  mental rotation  functional connectivity Index. décimale : PER Périodiques Résumé : Atypical visuospatial processing is commonly described in autism spectrum disorders (ASDs); however the specific neurobiological underpinnings of this phenomenon are poorly understood. Given the extensive evidence suggesting ASDs are characterized by abnormal neural connectivity, this study aimed to investigate network connectivity during visuospatial processing in ASD. Twenty-two males with ASD without intellectual disability and 22 individually matched controls performed a mental rotation task during functional magnetic resonance imaging (MRI) in which two rotated stimuli were judged to be same (“Same Trials”) or mirror-imaged (“Mirror Trials”). Behavioral results revealed a relative advantage of mental rotation in the ASD group—controls were slower responding to the more difficult Mirror Trials than Same Trials whereas the ASD group completed Mirror Trials and Same-trials at similar speeds. In the ASD group, brain activity was reduced in frontal, temporal, occipital, striatal, and cerebellar regions and, consistent with previous literature, functional connectivity between a number of brain regions was reduced. However, some connections appeared to be conserved and were recruited in a qualitatively different way by the two groups. As task difficulty increased (on Mirror Trials), controls tended to increase connections between certain brain regions, whereas the ASD group appeared to suppress connections between these regions. There was an interesting exception to this pattern in the visual cortex, a finding that may suggest an advantage in early visual perceptual processing in ASD. Overall, this study has identified a relative advantage in mental rotation in ASD that is associated with aberrant neural connectivity and that may stem from enhanced visual perceptual processing. Autism Res 2012, 5: 314–330. © 2012 International Society for Autism Research, Wiley Periodicals, Inc. En ligne : http://dx.doi.org/10.1002/aur.1245 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=183 [article] Atypical Visuospatial Processing in Autism: Insights from Functional Connectivity Analysis [Texte imprimé et/ou numérique] / Jane MCGRATH, Auteur ; Katherine A. JOHNSON, Auteur ; Christine ECKER, Auteur ; Erik O'HANLON, Auteur ; Michael GILL, Auteur ; Louise GALLAGHER, Auteur ; Hugh GARAVAN, Auteur . - p.314-330. Langues : Anglais (eng) in Autism Research > 5-5 (October 2012) . - p.314-330 Mots-clés : autism  functional MRI  visuospatial processing  mental rotation  functional connectivity Index. décimale : PER Périodiques Résumé : Atypical visuospatial processing is commonly described in autism spectrum disorders (ASDs); however the specific neurobiological underpinnings of this phenomenon are poorly understood. Given the extensive evidence suggesting ASDs are characterized by abnormal neural connectivity, this study aimed to investigate network connectivity during visuospatial processing in ASD. Twenty-two males with ASD without intellectual disability and 22 individually matched controls performed a mental rotation task during functional magnetic resonance imaging (MRI) in which two rotated stimuli were judged to be same (“Same Trials”) or mirror-imaged (“Mirror Trials”). Behavioral results revealed a relative advantage of mental rotation in the ASD group—controls were slower responding to the more difficult Mirror Trials than Same Trials whereas the ASD group completed Mirror Trials and Same-trials at similar speeds. In the ASD group, brain activity was reduced in frontal, temporal, occipital, striatal, and cerebellar regions and, consistent with previous literature, functional connectivity between a number of brain regions was reduced. However, some connections appeared to be conserved and were recruited in a qualitatively different way by the two groups. As task difficulty increased (on Mirror Trials), controls tended to increase connections between certain brain regions, whereas the ASD group appeared to suppress connections between these regions. There was an interesting exception to this pattern in the visual cortex, a finding that may suggest an advantage in early visual perceptual processing in ASD. Overall, this study has identified a relative advantage in mental rotation in ASD that is associated with aberrant neural connectivity and that may stem from enhanced visual perceptual processing. Autism Res 2012, 5: 314–330. © 2012 International Society for Autism Research, Wiley Periodicals, Inc. En ligne : http://dx.doi.org/10.1002/aur.1245 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=183

CRISIS AFAR: an international collaborative study of the impact of the COVID-19 pandemic on mental health and service access in youth with autism and neurodevelopmental conditions / Patricia SEGURA ; Louise GALLAGHER ; Stelios GEORGIADES ; Panagiota PERVANIDOU ; Audrey THURM ; Lindsay ALEXANDER ; Evdokia ANAGNOSTOU ; Yuta AOKI ; Catherine S. BIRKEN ; Somer L. BISHOP ; Jessica BOI ; Carmela BRAVACCIO ; Helena BRENTANI ; Paola CANEVINI ; Alessandra CARTA ; Alice CHARACH ; Antonella COSTANTINO ; Katherine T. COST ; Elaine A. CRAVO ; Jennifer CROSBIE ; Chiara DAVICO ; Federica DONNO ; Junya FUJINO ; Alessandra GABELLONE ; Cristiane T. GEYER ; Tomoya HIROTA ; Stephen KANNE ; Makiko KAWASHIMA ; Elizabeth KELLEY ; Hosanna KIM ; Young Shin KIM ; So Hyun KIM ; Daphne J. KORCZAK ; Meng-Chuan LAI ; Lucia MARGARI ; Lucia MARZULLI ; Gabriele MASI ; Luigi MAZZONE ; Jane MCGRATH ; Suneeta MONGA ; Paola MOROSINI ; Shinichiro NAKAJIMA ; Antonio NARZISI ; Rob NICOLSON ; Aki NIKOLAIDIS ; Yoshihiro NODA ; Kerri NOWELL ; Miriam POLIZZI ; Joana PORTOLESE ; Maria Pia RICCIO ; Manabu SAITO ; Ida SCHWARTZ ; Anish K. SIMHAL ; Martina SIRACUSANO ; Stefano SOTGIU ; Jacob STROUD ; Fernando SUMIYA ; Yoshiyuki TACHIBANA ; Nicole TAKAHASHI ; Riina TAKAHASHI ; Hiroki TAMON ; Raffaella TANCREDI ; Benedetto VITIELLO ; Alessandro ZUDDAS ; Bennett LEVENTHAL ; Kathleen MERIKANGAS ; Michael P. MILHAM ; Adriana DI MARTINO in Molecular Autism, 14 (2023)  

Public ISBD [article]  inMolecular Autism > 14 (2023) . - 7 p. Titre : CRISIS AFAR: an international collaborative study of the impact of the COVID-19 pandemic on mental health and service access in youth with autism and neurodevelopmental conditions Type de document : Texte imprimé et/ou numérique Auteurs : Patricia SEGURA, Auteur ; Louise GALLAGHER, Auteur ; Stelios GEORGIADES, Auteur ; Panagiota PERVANIDOU, Auteur ; Audrey THURM, Auteur ; Lindsay ALEXANDER, Auteur ; Evdokia ANAGNOSTOU, Auteur ; Yuta AOKI, Auteur ; Catherine S. BIRKEN, Auteur ; Somer L. BISHOP, Auteur ; Jessica BOI, Auteur ; Carmela BRAVACCIO, Auteur ; Helena BRENTANI, Auteur ; Paola CANEVINI, Auteur ; Alessandra CARTA, Auteur ; Alice CHARACH, Auteur ; Antonella COSTANTINO, Auteur ; Katherine T. COST, Auteur ; Elaine A. CRAVO, Auteur ; Jennifer CROSBIE, Auteur ; Chiara DAVICO, Auteur ; Federica DONNO, Auteur ; Junya FUJINO, Auteur ; Alessandra GABELLONE, Auteur ; Cristiane T. GEYER, Auteur ; Tomoya HIROTA, Auteur ; Stephen KANNE, Auteur ; Makiko KAWASHIMA, Auteur ; Elizabeth KELLEY, Auteur ; Hosanna KIM, Auteur ; Young Shin KIM, Auteur ; So Hyun KIM, Auteur ; Daphne J. KORCZAK, Auteur ; Meng-Chuan LAI, Auteur ; Lucia MARGARI, Auteur ; Lucia MARZULLI, Auteur ; Gabriele MASI, Auteur ; Luigi MAZZONE, Auteur ; Jane MCGRATH, Auteur ; Suneeta MONGA, Auteur ; Paola MOROSINI, Auteur ; Shinichiro NAKAJIMA, Auteur ; Antonio NARZISI, Auteur ; Rob NICOLSON, Auteur ; Aki NIKOLAIDIS, Auteur ; Yoshihiro NODA, Auteur ; Kerri NOWELL, Auteur ; Miriam POLIZZI, Auteur ; Joana PORTOLESE, Auteur ; Maria Pia RICCIO, Auteur ; Manabu SAITO, Auteur ; Ida SCHWARTZ, Auteur ; Anish K. SIMHAL, Auteur ; Martina SIRACUSANO, Auteur ; Stefano SOTGIU, Auteur ; Jacob STROUD, Auteur ; Fernando SUMIYA, Auteur ; Yoshiyuki TACHIBANA, Auteur ; Nicole TAKAHASHI, Auteur ; Riina TAKAHASHI, Auteur ; Hiroki TAMON, Auteur ; Raffaella TANCREDI, Auteur ; Benedetto VITIELLO, Auteur ; Alessandro ZUDDAS, Auteur ; Bennett LEVENTHAL, Auteur ; Kathleen MERIKANGAS, Auteur ; Michael P. MILHAM, Auteur ; Adriana DI MARTINO, Auteur Article en page(s) : 7 p. Langues : Anglais (eng) Index. décimale : PER Périodiques Résumé : BACKGROUND: Heterogeneous mental health outcomes during the COVID-19 pandemic are documented in the general population. Such heterogeneity has not been systematically assessed in youth with autism spectrum disorder (ASD) and related neurodevelopmental disorders (NDD). To identify distinct patterns of the pandemic impact and their predictors in ASD/NDD youth, we focused on pandemic-related changes in symptoms and access to services. METHODS: Using a naturalistic observational design, we assessed parent responses on the Coronavirus Health and Impact Survey Initiative (CRISIS) Adapted For Autism and Related neurodevelopmental conditions (AFAR). Cross-sectional AFAR data were aggregated across 14 European and North American sites yielding a clinically well-characterized sample of N=1275 individuals with ASD/NDD (age=11.0?+?3.6 years; n females=277). To identify subgroups with differential outcomes, we applied hierarchical clustering across eleven variables measuring changes in symptoms and access to services. Then, random forest classification assessed the importance of socio-demographics, pre-pandemic service rates, clinical severity of ASD-associated symptoms, and COVID-19 pandemic experiences/environments in predicting the outcome subgroups. RESULTS: Clustering revealed four subgroups. One subgroup-broad symptom worsening only (20%)-included youth with worsening across a range of symptoms but with service disruptions similar to the average of the aggregate sample. The other three subgroups were, relatively, clinically stable but differed in service access: primarily modified services (23%), primarily lost services (6%), and average services/symptom changes (53%). Distinct combinations of a set of pre-pandemic services, pandemic environment (e.g., COVID-19 new cases, restrictions), experiences (e.g., COVID-19 Worries), and age predicted each outcome subgroup. LIMITATIONS: Notable limitations of the study are its cross-sectional nature and focus on the first six months of the pandemic. CONCLUSIONS: Concomitantly assessing variation in changes of symptoms and service access during the first phase of the pandemic revealed differential outcome profiles in ASD/NDD youth. Subgroups were characterized by distinct prediction patterns across a set of pre- and pandemic-related experiences/contexts. Results may inform recovery efforts and preparedness in future crises; they also underscore the critical value of international data-sharing and collaborations to address the needs of those most vulnerable in times of crisis. En ligne : http://dx.doi.org/10.1186/s13229-022-00536-z Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=513 [article] CRISIS AFAR: an international collaborative study of the impact of the COVID-19 pandemic on mental health and service access in youth with autism and neurodevelopmental conditions [Texte imprimé et/ou numérique] / Patricia SEGURA, Auteur ; Louise GALLAGHER, Auteur ; Stelios GEORGIADES, Auteur ; Panagiota PERVANIDOU, Auteur ; Audrey THURM, Auteur ; Lindsay ALEXANDER, Auteur ; Evdokia ANAGNOSTOU, Auteur ; Yuta AOKI, Auteur ; Catherine S. BIRKEN, Auteur ; Somer L. BISHOP, Auteur ; Jessica BOI, Auteur ; Carmela BRAVACCIO, Auteur ; Helena BRENTANI, Auteur ; Paola CANEVINI, Auteur ; Alessandra CARTA, Auteur ; Alice CHARACH, Auteur ; Antonella COSTANTINO, Auteur ; Katherine T. COST, Auteur ; Elaine A. CRAVO, Auteur ; Jennifer CROSBIE, Auteur ; Chiara DAVICO, Auteur ; Federica DONNO, Auteur ; Junya FUJINO, Auteur ; Alessandra GABELLONE, Auteur ; Cristiane T. GEYER, Auteur ; Tomoya HIROTA, Auteur ; Stephen KANNE, Auteur ; Makiko KAWASHIMA, Auteur ; Elizabeth KELLEY, Auteur ; Hosanna KIM, Auteur ; Young Shin KIM, Auteur ; So Hyun KIM, Auteur ; Daphne J. KORCZAK, Auteur ; Meng-Chuan LAI, Auteur ; Lucia MARGARI, Auteur ; Lucia MARZULLI, Auteur ; Gabriele MASI, Auteur ; Luigi MAZZONE, Auteur ; Jane MCGRATH, Auteur ; Suneeta MONGA, Auteur ; Paola MOROSINI, Auteur ; Shinichiro NAKAJIMA, Auteur ; Antonio NARZISI, Auteur ; Rob NICOLSON, Auteur ; Aki NIKOLAIDIS, Auteur ; Yoshihiro NODA, Auteur ; Kerri NOWELL, Auteur ; Miriam POLIZZI, Auteur ; Joana PORTOLESE, Auteur ; Maria Pia RICCIO, Auteur ; Manabu SAITO, Auteur ; Ida SCHWARTZ, Auteur ; Anish K. SIMHAL, Auteur ; Martina SIRACUSANO, Auteur ; Stefano SOTGIU, Auteur ; Jacob STROUD, Auteur ; Fernando SUMIYA, Auteur ; Yoshiyuki TACHIBANA, Auteur ; Nicole TAKAHASHI, Auteur ; Riina TAKAHASHI, Auteur ; Hiroki TAMON, Auteur ; Raffaella TANCREDI, Auteur ; Benedetto VITIELLO, Auteur ; Alessandro ZUDDAS, Auteur ; Bennett LEVENTHAL, Auteur ; Kathleen MERIKANGAS, Auteur ; Michael P. MILHAM, Auteur ; Adriana DI MARTINO, Auteur . - 7 p. Langues : Anglais (eng) in Molecular Autism > 14 (2023) . - 7 p. Index. décimale : PER Périodiques Résumé : BACKGROUND: Heterogeneous mental health outcomes during the COVID-19 pandemic are documented in the general population. Such heterogeneity has not been systematically assessed in youth with autism spectrum disorder (ASD) and related neurodevelopmental disorders (NDD). To identify distinct patterns of the pandemic impact and their predictors in ASD/NDD youth, we focused on pandemic-related changes in symptoms and access to services. METHODS: Using a naturalistic observational design, we assessed parent responses on the Coronavirus Health and Impact Survey Initiative (CRISIS) Adapted For Autism and Related neurodevelopmental conditions (AFAR). Cross-sectional AFAR data were aggregated across 14 European and North American sites yielding a clinically well-characterized sample of N=1275 individuals with ASD/NDD (age=11.0?+?3.6 years; n females=277). To identify subgroups with differential outcomes, we applied hierarchical clustering across eleven variables measuring changes in symptoms and access to services. Then, random forest classification assessed the importance of socio-demographics, pre-pandemic service rates, clinical severity of ASD-associated symptoms, and COVID-19 pandemic experiences/environments in predicting the outcome subgroups. RESULTS: Clustering revealed four subgroups. One subgroup-broad symptom worsening only (20%)-included youth with worsening across a range of symptoms but with service disruptions similar to the average of the aggregate sample. The other three subgroups were, relatively, clinically stable but differed in service access: primarily modified services (23%), primarily lost services (6%), and average services/symptom changes (53%). Distinct combinations of a set of pre-pandemic services, pandemic environment (e.g., COVID-19 new cases, restrictions), experiences (e.g., COVID-19 Worries), and age predicted each outcome subgroup. LIMITATIONS: Notable limitations of the study are its cross-sectional nature and focus on the first six months of the pandemic. CONCLUSIONS: Concomitantly assessing variation in changes of symptoms and service access during the first phase of the pandemic revealed differential outcome profiles in ASD/NDD youth. Subgroups were characterized by distinct prediction patterns across a set of pre- and pandemic-related experiences/contexts. Results may inform recovery efforts and preparedness in future crises; they also underscore the critical value of international data-sharing and collaborations to address the needs of those most vulnerable in times of crisis. En ligne : http://dx.doi.org/10.1186/s13229-022-00536-z Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=513

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 et/ou numérique 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 et/ou numérique] / 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

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 et/ou numérique 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 et/ou numérique] / 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

White Matter and Visuospatial Processing in Autism: A Constrained Spherical Deconvolution Tractography Study / Jane MCGRATH in Autism Research, 6-5 (October 2013)  

Public ISBD [article]  inAutism Research > 6-5 (October 2013) . - p.307-319 Titre : White Matter and Visuospatial Processing in Autism: A Constrained Spherical Deconvolution Tractography Study Type de document : Texte imprimé et/ou numérique Auteurs : Jane MCGRATH, Auteur ; Katherine JOHNSON, Auteur ; Erik O'HANLON, Auteur ; Hugh GARAVAN, Auteur ; Louise GALLAGHER, Auteur ; Alexander LEEMANS, Auteur Article en page(s) : p.307-319 Langues : Anglais (eng) Mots-clés : diffusion MRI  constrained spherical deconvolution  tractography  autism  visuospatial processing  inferior fronto-occipital fasciculus Index. décimale : PER Périodiques Résumé : Autism spectrum disorders (ASDs) are associated with a marked disturbance of neural functional connectivity, which may arise from disrupted organization of white matter. The aim of this study was to use constrained spherical deconvolution (CSD)-based tractography to isolate and characterize major intrahemispheric white matter tracts that are important in visuospatial processing. CSD-based tractography avoids a number of critical confounds that are associated with diffusion tensor tractography, and to our knowledge, this is the first time that this advanced diffusion tractography method has been used in autism research. Twenty-five participants with ASD and aged 25, intelligence quotient-matched controls completed a high angular resolution diffusion imaging scan. The inferior fronto-occipital fasciculus (IFOF) and arcuate fasciculus were isolated using CSD-based tractography. Quantitative diffusion measures of white matter microstructural organization were compared between groups and associated with visuospatial processing performance. Significant alteration of white matter organization was present in the right IFOF in individuals with ASD. In addition, poorer visuospatial processing was associated in individuals with ASD with disrupted white matter in the right IFOF. Using a novel, advanced tractography method to isolate major intrahemispheric white matter tracts in autism, this research has demonstrated that there are significant alterations in the microstructural organization of white matter in the right IFOF in ASD. This alteration was associated with poorer visuospatial processing performance in the ASD group. This study provides an insight into structural brain abnormalities that may influence atypical visuospatial processing in autism. En ligne : http://dx.doi.org/10.1002/aur.1290 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=218 [article] White Matter and Visuospatial Processing in Autism: A Constrained Spherical Deconvolution Tractography Study [Texte imprimé et/ou numérique] / Jane MCGRATH, Auteur ; Katherine JOHNSON, Auteur ; Erik O'HANLON, Auteur ; Hugh GARAVAN, Auteur ; Louise GALLAGHER, Auteur ; Alexander LEEMANS, Auteur . - p.307-319. Langues : Anglais (eng) in Autism Research > 6-5 (October 2013) . - p.307-319 Mots-clés : diffusion MRI  constrained spherical deconvolution  tractography  autism  visuospatial processing  inferior fronto-occipital fasciculus Index. décimale : PER Périodiques Résumé : Autism spectrum disorders (ASDs) are associated with a marked disturbance of neural functional connectivity, which may arise from disrupted organization of white matter. The aim of this study was to use constrained spherical deconvolution (CSD)-based tractography to isolate and characterize major intrahemispheric white matter tracts that are important in visuospatial processing. CSD-based tractography avoids a number of critical confounds that are associated with diffusion tensor tractography, and to our knowledge, this is the first time that this advanced diffusion tractography method has been used in autism research. Twenty-five participants with ASD and aged 25, intelligence quotient-matched controls completed a high angular resolution diffusion imaging scan. The inferior fronto-occipital fasciculus (IFOF) and arcuate fasciculus were isolated using CSD-based tractography. Quantitative diffusion measures of white matter microstructural organization were compared between groups and associated with visuospatial processing performance. Significant alteration of white matter organization was present in the right IFOF in individuals with ASD. In addition, poorer visuospatial processing was associated in individuals with ASD with disrupted white matter in the right IFOF. Using a novel, advanced tractography method to isolate major intrahemispheric white matter tracts in autism, this research has demonstrated that there are significant alterations in the microstructural organization of white matter in the right IFOF in ASD. This alteration was associated with poorer visuospatial processing performance in the ASD group. This study provides an insight into structural brain abnormalities that may influence atypical visuospatial processing in autism. En ligne : http://dx.doi.org/10.1002/aur.1290 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=218

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