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Auteur Owen CHURCHES |
Documents disponibles écrits par cet auteur (2)
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Task-related functional connectivity in autism spectrum conditions: an EEG study using wavelet transform coherence / Ana CATARINO in Molecular Autism, (January 2013)
[article]
Titre : Task-related functional connectivity in autism spectrum conditions: an EEG study using wavelet transform coherence Type de document : Texte imprimé et/ou numérique Auteurs : Ana CATARINO, Auteur ; Alexandre ANDRADE, Auteur ; Owen CHURCHES, Auteur ; Adam WAGNER, Auteur ; Simon BARON-COHEN, Auteur ; Howard RING, Auteur Année de publication : 2013 Article en page(s) : 14 p. Mots-clés : Autism spectrum conditions Interhemispheric coherence Atypical connectivity Wavelet transform coherence Index. décimale : PER Périodiques Résumé : BACKGROUND:Autism Spectrum Conditions (ASC) are a set of pervasive neurodevelopmental conditions characterized by a wide range of lifelong signs and symptoms. Recent explanatory models of autism propose abnormal neural connectivity and are supported by studies showing decreased interhemispheric coherence in individuals with ASC. The first aim of this study was to test the hypothesis of reduced interhemispheric coherence in ASC, and secondly to investigate specific effects of task performance on interhemispheric coherence in ASC.METHODS:We analyzed electroencephalography (EEG) data from 15 participants with ASC and 15 typical controls, using Wavelet Transform Coherence (WTC) to calculate interhemispheric coherence during face and chair matching tasks, for EEG frequencies from 5 to 40 Hz and during the first 400 ms post-stimulus onset.RESULTS:Results demonstrate a reduction of interhemispheric coherence in the ASC group, relative to the control group, in both tasks and for all electrode pairs studied. For both tasks, group differences were generally observed after around 150 ms and at frequencies lower than 13 Hz. Regarding within-group task comparisons, while the control group presented differences in interhemispheric coherence between faces and chairs tasks at various electrode pairs (FT7-FT8, TP7-TP8, P7-P8), such differences were only seen for one electrode pair in the ASC group (T7-T8). No significant differences in EEG power spectra were observed between groups.CONCLUSIONS:Interhemispheric coherence is reduced in people with ASC, in a time and frequency specific manner, during visual perception and categorization of both social and inanimate stimuli and this reduction in coherence is widely dispersed across the brain.Results of within-group task comparisons may reflect an impairment in task differentiation in people with ASC relative to typically developing individuals.Overall, the results of this research support the value of WTC in examining the time-frequency microstructure of task-related interhemispheric EEG coherence in people with ASC. En ligne : http://dx.doi.org/10.1186/2040-2392-4-1 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=202
in Molecular Autism > (January 2013) . - 14 p.[article] Task-related functional connectivity in autism spectrum conditions: an EEG study using wavelet transform coherence [Texte imprimé et/ou numérique] / Ana CATARINO, Auteur ; Alexandre ANDRADE, Auteur ; Owen CHURCHES, Auteur ; Adam WAGNER, Auteur ; Simon BARON-COHEN, Auteur ; Howard RING, Auteur . - 2013 . - 14 p.
in Molecular Autism > (January 2013) . - 14 p.
Mots-clés : Autism spectrum conditions Interhemispheric coherence Atypical connectivity Wavelet transform coherence Index. décimale : PER Périodiques Résumé : BACKGROUND:Autism Spectrum Conditions (ASC) are a set of pervasive neurodevelopmental conditions characterized by a wide range of lifelong signs and symptoms. Recent explanatory models of autism propose abnormal neural connectivity and are supported by studies showing decreased interhemispheric coherence in individuals with ASC. The first aim of this study was to test the hypothesis of reduced interhemispheric coherence in ASC, and secondly to investigate specific effects of task performance on interhemispheric coherence in ASC.METHODS:We analyzed electroencephalography (EEG) data from 15 participants with ASC and 15 typical controls, using Wavelet Transform Coherence (WTC) to calculate interhemispheric coherence during face and chair matching tasks, for EEG frequencies from 5 to 40 Hz and during the first 400 ms post-stimulus onset.RESULTS:Results demonstrate a reduction of interhemispheric coherence in the ASC group, relative to the control group, in both tasks and for all electrode pairs studied. For both tasks, group differences were generally observed after around 150 ms and at frequencies lower than 13 Hz. Regarding within-group task comparisons, while the control group presented differences in interhemispheric coherence between faces and chairs tasks at various electrode pairs (FT7-FT8, TP7-TP8, P7-P8), such differences were only seen for one electrode pair in the ASC group (T7-T8). No significant differences in EEG power spectra were observed between groups.CONCLUSIONS:Interhemispheric coherence is reduced in people with ASC, in a time and frequency specific manner, during visual perception and categorization of both social and inanimate stimuli and this reduction in coherence is widely dispersed across the brain.Results of within-group task comparisons may reflect an impairment in task differentiation in people with ASC relative to typically developing individuals.Overall, the results of this research support the value of WTC in examining the time-frequency microstructure of task-related interhemispheric EEG coherence in people with ASC. En ligne : http://dx.doi.org/10.1186/2040-2392-4-1 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=202 The development of perceptual expertise for faces and objects in autism spectrum conditions / Cara R. DAMIANO in Autism Research, 4-4 (August 2011)
[article]
Titre : The development of perceptual expertise for faces and objects in autism spectrum conditions Type de document : Texte imprimé et/ou numérique Auteurs : Cara R. DAMIANO, Auteur ; Owen CHURCHES, Auteur ; Howard RING, Auteur ; Simon BARON-COHEN, Auteur Année de publication : 2011 Article en page(s) : p.297-301 Langues : Anglais (eng) Mots-clés : face processing object processing autism spectrum conditions inversion effect perceptual expertise configural processing local processing Index. décimale : PER Périodiques Résumé : Previous research indicates that individuals with autism spectrum conditions (ASC) do not develop face expertise to the same extent as typical individuals. Yet it remains unclear whether this atypicality is specific to faces or related to more pervasive perceptual or cognitive deficits involved in the actual process of gaining expertise. To address this question, we examined the extent to which adults with ASC were capable of developing expertise with non-face objects. To become experts, all participants completed a 2-week training program with novel objects, known as Greebles. Level of expertise was assessed throughout training by measuring the ability to identify Greebles on an individual level. The perceptual strategies acquired as a result of expertise were measured through an inversion effect task completed before and after training, in which performance with upright Greebles and faces was compared to performance with inverted Greebles and faces. After expertise training, it was found that individuals in both the ASC and the typical group successfully achieved expertise and showed an enhanced Greeble inversion effect as a result of training. The development of an inversion effect with Greebles suggests that individuals with ASC may employ the same processing strategies as the typical group. Although exploratory, these findings have implications for understanding the nature of the face processing deficit in ASC as well as offering potential insights into face processing interventions for individuals with ASC. En ligne : http://dx.doi.org/10.1002/aur.205 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=141
in Autism Research > 4-4 (August 2011) . - p.297-301[article] The development of perceptual expertise for faces and objects in autism spectrum conditions [Texte imprimé et/ou numérique] / Cara R. DAMIANO, Auteur ; Owen CHURCHES, Auteur ; Howard RING, Auteur ; Simon BARON-COHEN, Auteur . - 2011 . - p.297-301.
Langues : Anglais (eng)
in Autism Research > 4-4 (August 2011) . - p.297-301
Mots-clés : face processing object processing autism spectrum conditions inversion effect perceptual expertise configural processing local processing Index. décimale : PER Périodiques Résumé : Previous research indicates that individuals with autism spectrum conditions (ASC) do not develop face expertise to the same extent as typical individuals. Yet it remains unclear whether this atypicality is specific to faces or related to more pervasive perceptual or cognitive deficits involved in the actual process of gaining expertise. To address this question, we examined the extent to which adults with ASC were capable of developing expertise with non-face objects. To become experts, all participants completed a 2-week training program with novel objects, known as Greebles. Level of expertise was assessed throughout training by measuring the ability to identify Greebles on an individual level. The perceptual strategies acquired as a result of expertise were measured through an inversion effect task completed before and after training, in which performance with upright Greebles and faces was compared to performance with inverted Greebles and faces. After expertise training, it was found that individuals in both the ASC and the typical group successfully achieved expertise and showed an enhanced Greeble inversion effect as a result of training. The development of an inversion effect with Greebles suggests that individuals with ASC may employ the same processing strategies as the typical group. Although exploratory, these findings have implications for understanding the nature of the face processing deficit in ASC as well as offering potential insights into face processing interventions for individuals with ASC. En ligne : http://dx.doi.org/10.1002/aur.205 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=141