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Auteur Peter MITCHELL |
Documents disponibles écrits par cet auteur (18)



Are Individuals with Autism and Asperger's Syndrome Susceptible to Visual Illusions ? / Danielle ROPAR in Journal of Child Psychology and Psychiatry, 40-8 (November 1999)
[article]
Titre : Are Individuals with Autism and Asperger's Syndrome Susceptible to Visual Illusions ? Type de document : Texte imprimé et/ou numérique Auteurs : Danielle ROPAR, Auteur ; Peter MITCHELL, Auteur Année de publication : 1999 Article en page(s) : p.1283-1293 Langues : Anglais (eng) Mots-clés : Autism Asperger's syndrome weak central coherence illusions Index. décimale : PER Périodiques Résumé : A recent finding that individuals with autism are not susceptible to illusions has been explained by Happé (1996) as a sign of “weak central coherence” at lower levels of processing. We investigated the phenomenon with a more sophisticated measure. In Experiment 1, individuals with autism, Asperger's syndrome, moderate learning difficulties, and typical development adjusted certain comparison lines and circles to make them appear to be the same size in four visual illusions. With a minor exception, the participants with autism and Asperger's syndrome evinced a systematic bias in their judgements in the illusion condition. The extent of this was no different from control participants. In a second experiment, a similar finding was obtained in a task where participants made verbal judgements about the stimuli. The results suggest that lower-level coherence in visual processing in autism is intact. Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=125
in Journal of Child Psychology and Psychiatry > 40-8 (November 1999) . - p.1283-1293[article] Are Individuals with Autism and Asperger's Syndrome Susceptible to Visual Illusions ? [Texte imprimé et/ou numérique] / Danielle ROPAR, Auteur ; Peter MITCHELL, Auteur . - 1999 . - p.1283-1293.
Langues : Anglais (eng)
in Journal of Child Psychology and Psychiatry > 40-8 (November 1999) . - p.1283-1293
Mots-clés : Autism Asperger's syndrome weak central coherence illusions Index. décimale : PER Périodiques Résumé : A recent finding that individuals with autism are not susceptible to illusions has been explained by Happé (1996) as a sign of “weak central coherence” at lower levels of processing. We investigated the phenomenon with a more sophisticated measure. In Experiment 1, individuals with autism, Asperger's syndrome, moderate learning difficulties, and typical development adjusted certain comparison lines and circles to make them appear to be the same size in four visual illusions. With a minor exception, the participants with autism and Asperger's syndrome evinced a systematic bias in their judgements in the illusion condition. The extent of this was no different from control participants. In a second experiment, a similar finding was obtained in a task where participants made verbal judgements about the stimuli. The results suggest that lower-level coherence in visual processing in autism is intact. Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=125 Autism and Dimensionality: Differences Between Copying and Drawing Tasks / Elizabeth SHEPPARD in Journal of Autism and Developmental Disorders, 39-7 (July 2009)
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[article]
Titre : Autism and Dimensionality: Differences Between Copying and Drawing Tasks Type de document : Texte imprimé et/ou numérique Auteurs : Elizabeth SHEPPARD, Auteur ; Danielle ROPAR, Auteur ; Peter MITCHELL, Auteur Année de publication : 2009 Article en page(s) : p.1039-1046 Langues : Anglais (eng) Mots-clés : Autism Copying Drawing Perception Three-dimensionality Index. décimale : PER Périodiques Résumé : Previous research suggests individuals with autism may be less influenced by a three-dimensional interpretation when copying line drawings (Sheppard et al. J Autism Dev Disord 37:1913–1924, 2007). The current research aimed to determine whether this reduced dimensionality effect extends to drawings of an actual object. Twenty-four children and adolescents with autism and 24 comparison participants copied one line drawing with no depth cues, line drawings with a three-dimensional interpretation, and drew a actual three-dimensional object. Participants with autism were less influenced by three-dimensionality on the copying tasks but were equally affected when drawing the actual object. This suggests that any advantage for three-dimensional drawing in non-savant individuals with autism is confined to situations when the individual copies a line drawing with depth cues. En ligne : http://dx.doi.org/10.1007/s10803-009-0718-3 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=769
in Journal of Autism and Developmental Disorders > 39-7 (July 2009) . - p.1039-1046[article] Autism and Dimensionality: Differences Between Copying and Drawing Tasks [Texte imprimé et/ou numérique] / Elizabeth SHEPPARD, Auteur ; Danielle ROPAR, Auteur ; Peter MITCHELL, Auteur . - 2009 . - p.1039-1046.
Langues : Anglais (eng)
in Journal of Autism and Developmental Disorders > 39-7 (July 2009) . - p.1039-1046
Mots-clés : Autism Copying Drawing Perception Three-dimensionality Index. décimale : PER Périodiques Résumé : Previous research suggests individuals with autism may be less influenced by a three-dimensional interpretation when copying line drawings (Sheppard et al. J Autism Dev Disord 37:1913–1924, 2007). The current research aimed to determine whether this reduced dimensionality effect extends to drawings of an actual object. Twenty-four children and adolescents with autism and 24 comparison participants copied one line drawing with no depth cues, line drawings with a three-dimensional interpretation, and drew a actual three-dimensional object. Participants with autism were less influenced by three-dimensionality on the copying tasks but were equally affected when drawing the actual object. This suggests that any advantage for three-dimensional drawing in non-savant individuals with autism is confined to situations when the individual copies a line drawing with depth cues. En ligne : http://dx.doi.org/10.1007/s10803-009-0718-3 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=769 Brief Report: Do Individuals with Autism Spectrum Disorder Think They Know Their Own Minds? / Peter MITCHELL in Journal of Autism and Developmental Disorders, 38-8 (September 2008)
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[article]
Titre : Brief Report: Do Individuals with Autism Spectrum Disorder Think They Know Their Own Minds? Type de document : Texte imprimé et/ou numérique Auteurs : Peter MITCHELL, Auteur ; Kelly O'KEEFE, Auteur Année de publication : 2008 Article en page(s) : p.1591-1597 Langues : Anglais (eng) Mots-clés : Self-knowledge Theory-of-mind Estimations Subjectivity Index. décimale : PER Périodiques Résumé : How much do individuals with autism spectrum disorder (ASD) think they know about their inner states? To find out, we asked 24 participants with ASD and 24 non-clinical participants to rate how well they knew about six topics of self knowledge; they also rated how well a comparison individual knew these things about them. Participants with ASD differed from the non-clinical participants in assigning about the same amount of knowledge to the comparison individual as to themselves. Non-clinical participants, in contrast, assigned relatively more knowledge to themselves. The findings are consistent with the possibility that individuals with ASD do not appreciate the value of having first-person privileged access to their own inner states. En ligne : http://dx.doi.org/10.1007/s10803-007-0530-x Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=539
in Journal of Autism and Developmental Disorders > 38-8 (September 2008) . - p.1591-1597[article] Brief Report: Do Individuals with Autism Spectrum Disorder Think They Know Their Own Minds? [Texte imprimé et/ou numérique] / Peter MITCHELL, Auteur ; Kelly O'KEEFE, Auteur . - 2008 . - p.1591-1597.
Langues : Anglais (eng)
in Journal of Autism and Developmental Disorders > 38-8 (September 2008) . - p.1591-1597
Mots-clés : Self-knowledge Theory-of-mind Estimations Subjectivity Index. décimale : PER Périodiques Résumé : How much do individuals with autism spectrum disorder (ASD) think they know about their inner states? To find out, we asked 24 participants with ASD and 24 non-clinical participants to rate how well they knew about six topics of self knowledge; they also rated how well a comparison individual knew these things about them. Participants with ASD differed from the non-clinical participants in assigning about the same amount of knowledge to the comparison individual as to themselves. Non-clinical participants, in contrast, assigned relatively more knowledge to themselves. The findings are consistent with the possibility that individuals with ASD do not appreciate the value of having first-person privileged access to their own inner states. En ligne : http://dx.doi.org/10.1007/s10803-007-0530-x Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=539 Brief Report: How Adolescents with ASD Process Social Information in Complex Scenes. Combining Evidence from Eye Movements and Verbal Descriptions / Megan FREETH in Journal of Autism and Developmental Disorders, 41-3 (March 2011)
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Titre : Brief Report: How Adolescents with ASD Process Social Information in Complex Scenes. Combining Evidence from Eye Movements and Verbal Descriptions Type de document : Texte imprimé et/ou numérique Auteurs : Megan FREETH, Auteur ; Danielle ROPAR, Auteur ; Peter MITCHELL, Auteur ; Peter CHAPMAN, Auteur ; Sarah LOHER, Auteur Année de publication : 2011 Article en page(s) : p.364-371 Langues : Anglais (eng) Mots-clés : Transcript analysis Eye tracking Autism Social scenes Gaze following Emotion processing Index. décimale : PER Périodiques Résumé : We investigated attention, encoding and processing of social aspects of complex photographic scenes. Twenty-four high-functioning adolescents (aged 11–16) with ASD and 24 typically developing matched control participants viewed and then described a series of scenes, each containing a person. Analyses of eye movements and verbal descriptions provided converging evidence that both groups displayed general interest in the person in each scene but the salience of the person was reduced for the ASD participants. Nevertheless, the verbal descriptions revealed that participants with ASD frequently processed the observed person’s emotion or mental state without prompting. They also often mentioned eye-gaze direction, and there was evidence from eye movements and verbal descriptions that gaze was followed accurately. The combination of evidence from eye movements and verbal descriptions provides a rich insight into the way stimuli are processed overall. The merits of using these methods within the same paradigm are discussed. En ligne : http://dx.doi.org/10.1007/s10803-010-1053-4 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=118
in Journal of Autism and Developmental Disorders > 41-3 (March 2011) . - p.364-371[article] Brief Report: How Adolescents with ASD Process Social Information in Complex Scenes. Combining Evidence from Eye Movements and Verbal Descriptions [Texte imprimé et/ou numérique] / Megan FREETH, Auteur ; Danielle ROPAR, Auteur ; Peter MITCHELL, Auteur ; Peter CHAPMAN, Auteur ; Sarah LOHER, Auteur . - 2011 . - p.364-371.
Langues : Anglais (eng)
in Journal of Autism and Developmental Disorders > 41-3 (March 2011) . - p.364-371
Mots-clés : Transcript analysis Eye tracking Autism Social scenes Gaze following Emotion processing Index. décimale : PER Périodiques Résumé : We investigated attention, encoding and processing of social aspects of complex photographic scenes. Twenty-four high-functioning adolescents (aged 11–16) with ASD and 24 typically developing matched control participants viewed and then described a series of scenes, each containing a person. Analyses of eye movements and verbal descriptions provided converging evidence that both groups displayed general interest in the person in each scene but the salience of the person was reduced for the ASD participants. Nevertheless, the verbal descriptions revealed that participants with ASD frequently processed the observed person’s emotion or mental state without prompting. They also often mentioned eye-gaze direction, and there was evidence from eye movements and verbal descriptions that gaze was followed accurately. The combination of evidence from eye movements and verbal descriptions provides a rich insight into the way stimuli are processed overall. The merits of using these methods within the same paradigm are discussed. En ligne : http://dx.doi.org/10.1007/s10803-010-1053-4 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=118 Can Adults With Autism Spectrum Disorders Infer What Happened to Someone From Their Emotional Response? / Sarah A. CASSIDY in Autism Research, 7-1 (February 2014)
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Titre : Can Adults With Autism Spectrum Disorders Infer What Happened to Someone From Their Emotional Response? Type de document : Texte imprimé et/ou numérique Auteurs : Sarah A. CASSIDY, Auteur ; Danielle ROPAR, Auteur ; Peter MITCHELL, Auteur ; Peter CHAPMAN, Auteur Article en page(s) : p.112-123 Langues : Anglais (eng) Mots-clés : autism retrodictive mindreading eye tracking spontaneous emotion recognition face processing Index. décimale : PER Périodiques Résumé : Can adults with autism spectrum disorders (ASD) infer what happened to someone from their emotional response? Millikan has argued that in everyday life, others' emotions are most commonly used to work out the antecedents of behavior, an ability termed retrodictive mindreading. As those with ASD show difficulties interpreting others' emotions, we predicted that these individuals would have difficulty with retrodictive mindreading. Sixteen adults with high-functioning autism or Asperger's syndrome and 19 typically developing adults viewed 21 video clips of people reacting to one of three gifts (chocolate, monopoly money, or a homemade novelty) and then inferred what gift the recipient received and the emotion expressed by that person. Participants' eye movements were recorded while they viewed the videos. Results showed that participants with ASD were only less accurate when inferring who received a chocolate or homemade gift. This difficulty was not due to lack of understanding what emotions were appropriate in response to each gift, as both groups gave consistent gift and emotion inferences significantly above chance (genuine positive for chocolate and feigned positive for homemade). Those with ASD did not look significantly less to the eyes of faces in the videos, and looking to the eyes did not correlate with accuracy on the task. These results suggest that those with ASD are less accurate when retrodicting events involving recognition of genuine and feigned positive emotions, and challenge claims that lack of attention to the eyes causes emotion recognition difficulties in ASD. En ligne : http://dx.doi.org/10.1002/aur.1351 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=227
in Autism Research > 7-1 (February 2014) . - p.112-123[article] Can Adults With Autism Spectrum Disorders Infer What Happened to Someone From Their Emotional Response? [Texte imprimé et/ou numérique] / Sarah A. CASSIDY, Auteur ; Danielle ROPAR, Auteur ; Peter MITCHELL, Auteur ; Peter CHAPMAN, Auteur . - p.112-123.
Langues : Anglais (eng)
in Autism Research > 7-1 (February 2014) . - p.112-123
Mots-clés : autism retrodictive mindreading eye tracking spontaneous emotion recognition face processing Index. décimale : PER Périodiques Résumé : Can adults with autism spectrum disorders (ASD) infer what happened to someone from their emotional response? Millikan has argued that in everyday life, others' emotions are most commonly used to work out the antecedents of behavior, an ability termed retrodictive mindreading. As those with ASD show difficulties interpreting others' emotions, we predicted that these individuals would have difficulty with retrodictive mindreading. Sixteen adults with high-functioning autism or Asperger's syndrome and 19 typically developing adults viewed 21 video clips of people reacting to one of three gifts (chocolate, monopoly money, or a homemade novelty) and then inferred what gift the recipient received and the emotion expressed by that person. Participants' eye movements were recorded while they viewed the videos. Results showed that participants with ASD were only less accurate when inferring who received a chocolate or homemade gift. This difficulty was not due to lack of understanding what emotions were appropriate in response to each gift, as both groups gave consistent gift and emotion inferences significantly above chance (genuine positive for chocolate and feigned positive for homemade). Those with ASD did not look significantly less to the eyes of faces in the videos, and looking to the eyes did not correlate with accuracy on the task. These results suggest that those with ASD are less accurate when retrodicting events involving recognition of genuine and feigned positive emotions, and challenge claims that lack of attention to the eyes causes emotion recognition difficulties in ASD. En ligne : http://dx.doi.org/10.1002/aur.1351 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=227 Do individuals with autism spectrum disorders infer traits from behavior? / Rajani RAMACHANDRAN in Journal of Child Psychology and Psychiatry, 50-7 (July 2009)
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PermalinkHow are Autistic People Perceived? A Reply to Chown, Hughes and Baker-Rogers (2019) / Elizabeth SHEPPARD in Journal of Autism and Developmental Disorders, 50-8 (August 2020)
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PermalinkHow Easy is it to Read the Minds of People with Autism Spectrum Disorder? / Elizabeth SHEPPARD in Journal of Autism and Developmental Disorders, 46-4 (April 2016)
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PermalinkOrienting of visual attention among persons with autism spectrum disorders: reading versus responding to symbolic cues / Oriane LANDRY in Journal of Child Psychology and Psychiatry, 50-7 (July 2009)
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PermalinkPerceiving the impossible: How individuals with autism copy paradoxical figures / Elizabeth SHEPPARD in Autism, 13-4 (July 2009)
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PermalinkProcessing of Spontaneous Emotional Responses in Adolescents and Adults with Autism Spectrum Disorders: Effect of Stimulus Type / Sarah A. CASSIDY in Autism Research, 8-5 (October 2015)
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PermalinkRecognizing faces based on inferred traits in autism spectrum disorders / Rajani RAMACHANDRAN in Autism, 14-6 (November 2010)
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PermalinkSusceptibility to the Shepard illusion in participants with autism: reduced top-down influences within perception? / Peter MITCHELL in Autism Research, 3-3 (June 2010)
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PermalinkThe Impact of Meaning and Dimensionality on Copying Accuracy in Individuals with Autism / Elizabeth SHEPPARD in Journal of Autism and Developmental Disorders, 37-10 (November 2007)
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