Altered automatic face processing in individuals with high-functioning autism spectrum disorders: Evidence from visual evoked potentials / Takako FUJITA in Research in Autism Spectrum Disorders, 7-6 (June 2013)  

Public ISBD [article]  inResearch in Autism Spectrum Disorders > 7-6 (June 2013) . - p.710-720 Titre : Altered automatic face processing in individuals with high-functioning autism spectrum disorders: Evidence from visual evoked potentials Type de document : Texte imprimé et/ou numérique Auteurs : Takako FUJITA, Auteur ; Yoko KAMIO, Auteur ; Takao YAMASAKI, Auteur ; Sawa YASUMOTO, Auteur ; Shinichi HIROSE, Auteur ; Shozo TOBIMATSU, Auteur Article en page(s) : p.710-720 Langues : Anglais (eng) Mots-clés : Autism spectrum disorder (ASD)  Visual evoked potentials (VEPs)  Automatic face processing  Subliminal perception  Fearful face Index. décimale : PER Périodiques Résumé : Individuals with autism spectrum disorders (ASDs) have different automatic responses to faces than typically developing (TD) individuals. We recorded visual evoked potentials (VEPs) in 10 individuals with high-functioning ASD (HFASD) and 10 TD individuals. Visual stimuli consisted of upright and inverted faces (fearful and neutral) and objects presented subliminally in a backward-masking paradigm. In all participants, the occipital N1 (about 100 ms) and P1 (about 120 ms) peaks were major components of the evoked response. We calculated “subliminal face effect (SFE)” scores by subtracting the N1/P1 amplitudes and latencies of the object stimuli from those of the face stimuli. In the TD group, the SFE score for the N1 amplitude was significantly higher for upright fearful faces but not neutral faces, and this score was insignificant when the stimuli were inverted. In contrast, the N1 amplitude of the HFASD subjects did not show this SFE in the upright orientation. There were no significant group differences in SFE scores for P1 amplitude, latency, or N1 latency. Our findings suggest that individuals with HFASD have altered automatic visual processing for emotional faces within the lower level of the visual cortex. This impairment could be a neural component of the disrupted social cognition observed in individuals with HFASD. En ligne : http://dx.doi.org/10.1016/j.rasd.2013.03.001 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=199 [article] Altered automatic face processing in individuals with high-functioning autism spectrum disorders: Evidence from visual evoked potentials [Texte imprimé et/ou numérique] / Takako FUJITA, Auteur ; Yoko KAMIO, Auteur ; Takao YAMASAKI, Auteur ; Sawa YASUMOTO, Auteur ; Shinichi HIROSE, Auteur ; Shozo TOBIMATSU, Auteur . - p.710-720. Langues : Anglais (eng) in Research in Autism Spectrum Disorders > 7-6 (June 2013) . - p.710-720 Mots-clés : Autism spectrum disorder (ASD)  Visual evoked potentials (VEPs)  Automatic face processing  Subliminal perception  Fearful face Index. décimale : PER Périodiques Résumé : Individuals with autism spectrum disorders (ASDs) have different automatic responses to faces than typically developing (TD) individuals. We recorded visual evoked potentials (VEPs) in 10 individuals with high-functioning ASD (HFASD) and 10 TD individuals. Visual stimuli consisted of upright and inverted faces (fearful and neutral) and objects presented subliminally in a backward-masking paradigm. In all participants, the occipital N1 (about 100 ms) and P1 (about 120 ms) peaks were major components of the evoked response. We calculated “subliminal face effect (SFE)” scores by subtracting the N1/P1 amplitudes and latencies of the object stimuli from those of the face stimuli. In the TD group, the SFE score for the N1 amplitude was significantly higher for upright fearful faces but not neutral faces, and this score was insignificant when the stimuli were inverted. In contrast, the N1 amplitude of the HFASD subjects did not show this SFE in the upright orientation. There were no significant group differences in SFE scores for P1 amplitude, latency, or N1 latency. Our findings suggest that individuals with HFASD have altered automatic visual processing for emotional faces within the lower level of the visual cortex. This impairment could be a neural component of the disrupted social cognition observed in individuals with HFASD. En ligne : http://dx.doi.org/10.1016/j.rasd.2013.03.001 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=199

Parvocellular pathway impairment in autism spectrum disorder: Evidence from visual evoked potentials / Takako FUJITA in Research in Autism Spectrum Disorders, 5-1 (January-March 2011)  

Public ISBD [article]  inResearch in Autism Spectrum Disorders > 5-1 (January-March 2011) . - p.277-285 Titre : Parvocellular pathway impairment in autism spectrum disorder: Evidence from visual evoked potentials Type de document : Texte imprimé et/ou numérique Auteurs : Takako FUJITA, Auteur ; Yoko KAMIO, Auteur ; Shozo TOBIMATSU, Auteur ; Takao YAMASAKI, Auteur ; Shinichi HIROSE, Auteur Année de publication : 2011 Article en page(s) : p.277-285 Langues : Anglais (eng) Mots-clés : Autism-spectrum-disorder-(ASD) Visual-evoked-potentials-(VEPs) Parallel-visual-pathways Parvocellular-and-magnocellular-systems Index. décimale : PER Périodiques Résumé : In humans, visual information is processed via parallel channels: the parvocellular (P) pathway analyzes color and form information, whereas the magnocellular (M) stream plays an important role in motion analysis. Individuals with autism spectrum disorder (ASD) often show superior performance in processing fine detail, but impaired performance in processing global structure and motion information. To date, no visual evoked potential (VEP) studies have examined the neural basis of atypical visual performance in ASD. VEPs were recorded using 128-channel high density EEG to investigate whether the P and M pathways are functionally altered in ASD. The functioning of the P and M pathways within primary visual cortex (V1) were evaluated using chromatic (equiluminant red–green sinusoidal gratings) and achromatic (low contrast black–white sinusoidal gratings) stimuli, respectively. Unexpectedly, the N1 component of VEPs to chromatic gratings was significantly prolonged in ASD patients compared to controls. However, VEP responses to achromatic gratings did not differ significantly between the two groups. Because chromatic stimuli preferentially stimulate the P-color but not the P-form pathway, our findings suggest that ASD is associated with impaired P-color pathway activity. Our study provides the first electrophysiological evidence for P-color pathway impairments with preserved M function at the V1 level in ASD. En ligne : http://dx.doi.org/10.1016/j.rasd.2010.04.009 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=111 [article] Parvocellular pathway impairment in autism spectrum disorder: Evidence from visual evoked potentials [Texte imprimé et/ou numérique] / Takako FUJITA, Auteur ; Yoko KAMIO, Auteur ; Shozo TOBIMATSU, Auteur ; Takao YAMASAKI, Auteur ; Shinichi HIROSE, Auteur . - 2011 . - p.277-285. Langues : Anglais (eng) in Research in Autism Spectrum Disorders > 5-1 (January-March 2011) . - p.277-285 Mots-clés : Autism-spectrum-disorder-(ASD) Visual-evoked-potentials-(VEPs) Parallel-visual-pathways Parvocellular-and-magnocellular-systems Index. décimale : PER Périodiques Résumé : In humans, visual information is processed via parallel channels: the parvocellular (P) pathway analyzes color and form information, whereas the magnocellular (M) stream plays an important role in motion analysis. Individuals with autism spectrum disorder (ASD) often show superior performance in processing fine detail, but impaired performance in processing global structure and motion information. To date, no visual evoked potential (VEP) studies have examined the neural basis of atypical visual performance in ASD. VEPs were recorded using 128-channel high density EEG to investigate whether the P and M pathways are functionally altered in ASD. The functioning of the P and M pathways within primary visual cortex (V1) were evaluated using chromatic (equiluminant red–green sinusoidal gratings) and achromatic (low contrast black–white sinusoidal gratings) stimuli, respectively. Unexpectedly, the N1 component of VEPs to chromatic gratings was significantly prolonged in ASD patients compared to controls. However, VEP responses to achromatic gratings did not differ significantly between the two groups. Because chromatic stimuli preferentially stimulate the P-color but not the P-form pathway, our findings suggest that ASD is associated with impaired P-color pathway activity. Our study provides the first electrophysiological evidence for P-color pathway impairments with preserved M function at the V1 level in ASD. En ligne : http://dx.doi.org/10.1016/j.rasd.2010.04.009 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=111

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