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

Electrophysiological evidence for selective impairment of optic flow perception in autism spectrum disorder / Takao YAMASAKI 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.400-407 Titre : Electrophysiological evidence for selective impairment of optic flow perception in autism spectrum disorder Type de document : Texte imprimé et/ou numérique Auteurs : Takao YAMASAKI, Auteur ; Yoko KAMIO, Auteur ; Shozo TOBIMATSU, Auteur ; Takako FUJITA, Auteur ; Katsuya OGATA, Auteur ; Yoshinobu GOTO, Auteur ; Shinji MUNETSUNA, Auteur Année de publication : 2011 Article en page(s) : p.400-407 Langues : Anglais (eng) Mots-clés : Autism-spectrum-disorder Coherent-motion-perception Optic-flow Dorso-dorsal-pathway Ventro-dorsal-pathway Event-related-potentials Index. décimale : PER Périodiques Résumé : People with autism spectrum disorder (ASD) often show inferior global motion performance with superior performance in detail form perception, suggesting dysfunction of the dorsal visual stream. To elucidate the neural basis of impaired global motion perception in ASD, we measured psychophysical threshold and visual event-related potentials (ERPs) with a 128-channel system in 12 ASD and 12 healthy control adults. Radial optic flow (OF) and horizontal motion (HO) were used as the visual stimuli. The former was related to the ventro-dorsal stream formed by the inferior parietal lobule, while the latter was conveyed from the dorso-dorsal stream formed by the superior parietal lobule. No significant group differences were observed in the motion thresholds for both OF and HO. N170 and P200 were elicited as major components of ERPs in both groups. However, the latencies of both components for OF but not HO were significantly prolonged in ASD compared with the control group. Our ERP results suggest that ASD has a selective impairment for OF processing even though the psychophysical thresholds are preserved. Therefore, we provide the first electrophysiological evidence for altered function of the higher-level dorsal visual stream in ASD, specifically the ventro-dorsal stream closely related to OF perception. En ligne : http://dx.doi.org/10.1016/j.rasd.2010.06.002 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=111 [article] Electrophysiological evidence for selective impairment of optic flow perception in autism spectrum disorder [Texte imprimé et/ou numérique] / Takao YAMASAKI, Auteur ; Yoko KAMIO, Auteur ; Shozo TOBIMATSU, Auteur ; Takako FUJITA, Auteur ; Katsuya OGATA, Auteur ; Yoshinobu GOTO, Auteur ; Shinji MUNETSUNA, Auteur . - 2011 . - p.400-407. Langues : Anglais (eng) in Research in Autism Spectrum Disorders > 5-1 (January-March 2011) . - p.400-407 Mots-clés : Autism-spectrum-disorder Coherent-motion-perception Optic-flow Dorso-dorsal-pathway Ventro-dorsal-pathway Event-related-potentials Index. décimale : PER Périodiques Résumé : People with autism spectrum disorder (ASD) often show inferior global motion performance with superior performance in detail form perception, suggesting dysfunction of the dorsal visual stream. To elucidate the neural basis of impaired global motion perception in ASD, we measured psychophysical threshold and visual event-related potentials (ERPs) with a 128-channel system in 12 ASD and 12 healthy control adults. Radial optic flow (OF) and horizontal motion (HO) were used as the visual stimuli. The former was related to the ventro-dorsal stream formed by the inferior parietal lobule, while the latter was conveyed from the dorso-dorsal stream formed by the superior parietal lobule. No significant group differences were observed in the motion thresholds for both OF and HO. N170 and P200 were elicited as major components of ERPs in both groups. However, the latencies of both components for OF but not HO were significantly prolonged in ASD compared with the control group. Our ERP results suggest that ASD has a selective impairment for OF processing even though the psychophysical thresholds are preserved. Therefore, we provide the first electrophysiological evidence for altered function of the higher-level dorsal visual stream in ASD, specifically the ventro-dorsal stream closely related to OF perception. En ligne : http://dx.doi.org/10.1016/j.rasd.2010.06.002 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=111

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

Top-down and bottom-up visual information processing of non-social stimuli in high-functioning autism spectrum disorder / Toshihiko MAEKAWA 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.201-209 Titre : Top-down and bottom-up visual information processing of non-social stimuli in high-functioning autism spectrum disorder Type de document : Texte imprimé et/ou numérique Auteurs : Toshihiko MAEKAWA, Auteur ; Yoko KAMIO, Auteur ; Naoko INADA, Auteur ; Shozo TOBIMATSU, Auteur ; Naoya ORIBE, Auteur ; Toshiaki ONITSUKA, Auteur ; Shigenobu KANBA, Auteur Année de publication : 2011 Article en page(s) : p.201-209 Langues : Anglais (eng) Mots-clés : Autism-spectrum-disorder Mismatch-negativity P300 Bottom-up-attention Top-down-attention Visual-processing Index. décimale : PER Périodiques Résumé : Individuals with high-functioning autism spectrum disorder (HF-ASD) often show superior performance in simple visual tasks, despite difficulties in the perception of socially important information such as facial expression. The neural basis of visual perception abnormalities associated with HF-ASD is currently unclear. We sought to elucidate the functioning of bottom-up and top-down visual information processing in HF-ASD using event-related potentials (ERPs). Eleven adults with HF-ASD and 11 age-matched normal controls (NC) participated in this study. Visual ERPs were recorded using 128-channel EEG. The P1 and P300 were recorded in response to target stimuli. Visual mismatch negativity (vMMN) potentials were obtained by subtracting responses to standard from those to deviant stimuli. Behaviorally, individuals with HF-ASD showed faster target detection than NCs. However, vMMN amplitude and latency were the same between the two groups. In contrast, P1 and P300 amplitudes were significantly decreased in HF-ASD compared with NCs. In addition, P300 latency was significantly delayed in HF-ASD. Individuals with HF-ASD exhibit altered visual information processing. Intact bottom-up attention (vMMN) may contribute to their superior simple visual task performance in spite of abnormal low-level (P1) and top-down (P300) visual information processing. En ligne : http://dx.doi.org/10.1016/j.rasd.2010.03.012 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=111 [article] Top-down and bottom-up visual information processing of non-social stimuli in high-functioning autism spectrum disorder [Texte imprimé et/ou numérique] / Toshihiko MAEKAWA, Auteur ; Yoko KAMIO, Auteur ; Naoko INADA, Auteur ; Shozo TOBIMATSU, Auteur ; Naoya ORIBE, Auteur ; Toshiaki ONITSUKA, Auteur ; Shigenobu KANBA, Auteur . - 2011 . - p.201-209. Langues : Anglais (eng) in Research in Autism Spectrum Disorders > 5-1 (January-March 2011) . - p.201-209 Mots-clés : Autism-spectrum-disorder Mismatch-negativity P300 Bottom-up-attention Top-down-attention Visual-processing Index. décimale : PER Périodiques Résumé : Individuals with high-functioning autism spectrum disorder (HF-ASD) often show superior performance in simple visual tasks, despite difficulties in the perception of socially important information such as facial expression. The neural basis of visual perception abnormalities associated with HF-ASD is currently unclear. We sought to elucidate the functioning of bottom-up and top-down visual information processing in HF-ASD using event-related potentials (ERPs). Eleven adults with HF-ASD and 11 age-matched normal controls (NC) participated in this study. Visual ERPs were recorded using 128-channel EEG. The P1 and P300 were recorded in response to target stimuli. Visual mismatch negativity (vMMN) potentials were obtained by subtracting responses to standard from those to deviant stimuli. Behaviorally, individuals with HF-ASD showed faster target detection than NCs. However, vMMN amplitude and latency were the same between the two groups. In contrast, P1 and P300 amplitudes were significantly decreased in HF-ASD compared with NCs. In addition, P300 latency was significantly delayed in HF-ASD. Individuals with HF-ASD exhibit altered visual information processing. Intact bottom-up attention (vMMN) may contribute to their superior simple visual task performance in spite of abnormal low-level (P1) and top-down (P300) visual information processing. En ligne : http://dx.doi.org/10.1016/j.rasd.2010.03.012 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=111

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