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Auteur Laurence CHABY |
Documents disponibles écrits par cet auteur (2)
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Children with autism spectrum disorder produce more ambiguous and less socially meaningful facial expressions: an experimental study using random forest classifiers / Charline GROSSARD in Molecular Autism, 11 (2020)
[article]
Titre : Children with autism spectrum disorder produce more ambiguous and less socially meaningful facial expressions: an experimental study using random forest classifiers Type de document : Texte imprimé et/ou numérique Auteurs : Charline GROSSARD, Auteur ; Arnaud DAPOGNY, Auteur ; David COHEN, Auteur ; Sacha BERNHEIM, Auteur ; Estelle JUILLET, Auteur ; Fanny HAMEL, Auteur ; Stéphanie HUN, Auteur ; Jérémy BOURGEOIS, Auteur ; Hugues PELLERIN, Auteur ; Sylvie SERRET, Auteur ; Kevin BAILLY, Auteur ; Laurence CHABY, Auteur Article en page(s) : 5 p. Langues : Anglais (eng) Mots-clés : Algorithm Autism spectrum disorder Emotion Facial expressions Index. décimale : PER Périodiques Résumé : BACKGROUND: Computer vision combined with human annotation could offer a novel method for exploring facial expression (FE) dynamics in children with autism spectrum disorder (ASD). METHODS: We recruited 157 children with typical development (TD) and 36 children with ASD in Paris and Nice to perform two experimental tasks to produce FEs with emotional valence. FEs were explored by judging ratings and by random forest (RF) classifiers. To do so, we located a set of 49 facial landmarks in the task videos, we generated a set of geometric and appearance features and we used RF classifiers to explore how children with ASD differed from TD children when producing FEs. RESULTS: Using multivariate models including other factors known to predict FEs (age, gender, intellectual quotient, emotion subtype, cultural background), ratings from expert raters showed that children with ASD had more difficulty producing FEs than TD children. In addition, when we explored how RF classifiers performed, we found that classification tasks, except for those for sadness, were highly accurate and that RF classifiers needed more facial landmarks to achieve the best classification for children with ASD. Confusion matrices showed that when RF classifiers were tested in children with ASD, anger was often confounded with happiness. LIMITATIONS: The sample size of the group of children with ASD was lower than that of the group of TD children. By using several control calculations, we tried to compensate for this limitation. CONCLUSION: Children with ASD have more difficulty producing socially meaningful FEs. The computer vision methods we used to explore FE dynamics also highlight that the production of FEs in children with ASD carries more ambiguity. En ligne : http://dx.doi.org/10.1186/s13229-020-0312-2 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=427
in Molecular Autism > 11 (2020) . - 5 p.[article] Children with autism spectrum disorder produce more ambiguous and less socially meaningful facial expressions: an experimental study using random forest classifiers [Texte imprimé et/ou numérique] / Charline GROSSARD, Auteur ; Arnaud DAPOGNY, Auteur ; David COHEN, Auteur ; Sacha BERNHEIM, Auteur ; Estelle JUILLET, Auteur ; Fanny HAMEL, Auteur ; Stéphanie HUN, Auteur ; Jérémy BOURGEOIS, Auteur ; Hugues PELLERIN, Auteur ; Sylvie SERRET, Auteur ; Kevin BAILLY, Auteur ; Laurence CHABY, Auteur . - 5 p.
Langues : Anglais (eng)
in Molecular Autism > 11 (2020) . - 5 p.
Mots-clés : Algorithm Autism spectrum disorder Emotion Facial expressions Index. décimale : PER Périodiques Résumé : BACKGROUND: Computer vision combined with human annotation could offer a novel method for exploring facial expression (FE) dynamics in children with autism spectrum disorder (ASD). METHODS: We recruited 157 children with typical development (TD) and 36 children with ASD in Paris and Nice to perform two experimental tasks to produce FEs with emotional valence. FEs were explored by judging ratings and by random forest (RF) classifiers. To do so, we located a set of 49 facial landmarks in the task videos, we generated a set of geometric and appearance features and we used RF classifiers to explore how children with ASD differed from TD children when producing FEs. RESULTS: Using multivariate models including other factors known to predict FEs (age, gender, intellectual quotient, emotion subtype, cultural background), ratings from expert raters showed that children with ASD had more difficulty producing FEs than TD children. In addition, when we explored how RF classifiers performed, we found that classification tasks, except for those for sadness, were highly accurate and that RF classifiers needed more facial landmarks to achieve the best classification for children with ASD. Confusion matrices showed that when RF classifiers were tested in children with ASD, anger was often confounded with happiness. LIMITATIONS: The sample size of the group of children with ASD was lower than that of the group of TD children. By using several control calculations, we tried to compensate for this limitation. CONCLUSION: Children with ASD have more difficulty producing socially meaningful FEs. The computer vision methods we used to explore FE dynamics also highlight that the production of FEs in children with ASD carries more ambiguity. En ligne : http://dx.doi.org/10.1186/s13229-020-0312-2 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=427 Neutral versus emotional human stimuli processing in children with pervasive developmental disorders not otherwise specified / Léonard VANNETZEL in Research in Autism Spectrum Disorders, 5-2 (April-June 2011)
[article]
Titre : Neutral versus emotional human stimuli processing in children with pervasive developmental disorders not otherwise specified Type de document : Texte imprimé et/ou numérique Auteurs : Léonard VANNETZEL, Auteur ; Laurence CHABY, Auteur ; Fabienne CAUTRU, Auteur ; David COHEN, Auteur ; Monique PLAZA, Auteur Année de publication : 2011 Article en page(s) : p.775-783 Langues : Anglais (eng) Mots-clés : PDD-NOS Autism Children Human stimuli Neutral Emotional Visual Auditory Multimodal processing Index. décimale : PER Périodiques Résumé : Pervasive developmental disorder not otherwise specified (PDD-NOS) represents up to two-thirds of autism spectrum disorders; however, it is usually described in terms of the symptoms not shared by autism. The study explores processing of neutral and emotional human stimuli (by auditory, visual and multimodal channels) in children with PDD-NOS (n = 10) compared to typically developing children (n = 35). The neutral human stimuli consisted of faces and common first names. The emotional human stimuli consisted of happy, sad, angry, and neutral faces and vocalizations. The results confirmed previous findings and led to others. The PDD-NOS group (a) accurately processed neutral human stimuli; (b) had difficulty processing emotional stimuli in general and more easily identified happy compared to angry or neutral faces and vocalizations; (c) had a strong discrepancy between emotional and neutral human stimuli processing; (d) used the multimodal channel to compensate for unimodal deficits, especially for angry faces; and (e) was strongly heterogeneous. En ligne : http://dx.doi.org/10.1016/j.rasd.2010.09.005 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=114
in Research in Autism Spectrum Disorders > 5-2 (April-June 2011) . - p.775-783[article] Neutral versus emotional human stimuli processing in children with pervasive developmental disorders not otherwise specified [Texte imprimé et/ou numérique] / Léonard VANNETZEL, Auteur ; Laurence CHABY, Auteur ; Fabienne CAUTRU, Auteur ; David COHEN, Auteur ; Monique PLAZA, Auteur . - 2011 . - p.775-783.
Langues : Anglais (eng)
in Research in Autism Spectrum Disorders > 5-2 (April-June 2011) . - p.775-783
Mots-clés : PDD-NOS Autism Children Human stimuli Neutral Emotional Visual Auditory Multimodal processing Index. décimale : PER Périodiques Résumé : Pervasive developmental disorder not otherwise specified (PDD-NOS) represents up to two-thirds of autism spectrum disorders; however, it is usually described in terms of the symptoms not shared by autism. The study explores processing of neutral and emotional human stimuli (by auditory, visual and multimodal channels) in children with PDD-NOS (n = 10) compared to typically developing children (n = 35). The neutral human stimuli consisted of faces and common first names. The emotional human stimuli consisted of happy, sad, angry, and neutral faces and vocalizations. The results confirmed previous findings and led to others. The PDD-NOS group (a) accurately processed neutral human stimuli; (b) had difficulty processing emotional stimuli in general and more easily identified happy compared to angry or neutral faces and vocalizations; (c) had a strong discrepancy between emotional and neutral human stimuli processing; (d) used the multimodal channel to compensate for unimodal deficits, especially for angry faces; and (e) was strongly heterogeneous. En ligne : http://dx.doi.org/10.1016/j.rasd.2010.09.005 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=114