20 recherche sur le mot-clé 'Complexity'

Atypical autonomic nervous system complexity accompanies social cognition task performance in ASD / Hamidreza SAGHIR in Research in Autism Spectrum Disorders, 39 (July 2017)  

Public ISBD [article]  inResearch in Autism Spectrum Disorders > 39 (July 2017) . - p.54-62 Titre : Atypical autonomic nervous system complexity accompanies social cognition task performance in ASD Type de document : texte imprimé Auteurs : Hamidreza SAGHIR, Auteur ; Annie DUPUIS, Auteur ; Tom CHAU, Auteur ; Azadeh KUSHKI, Auteur Article en page(s) : p.54-62 Langues : Anglais (eng) Mots-clés : Autism spectrum disorder  Autonomic nervous system  Complexity analysis  Social cognition  RMET  Theory of mind  ASD in children Index. décimale : PER Périodiques Résumé : AbstractBackground Emerging evidence suggests that autonomic nervous system (ANS) function is affected in ASD. Existing literature has focused on quantifying the activity of ANS components (i.e. sympathetic/parasympathetic systems) individually. To this end, measures such as respiratory sinus arrhythmia (RSA) and high- and low-frequency spectral components of heart rate variability have been employed. Recent findings indicate that these methods employ assumptions that do not fully consider the complexity of the ANS system and the interaction of its components. To this end, we propose a new method for examining ANS function in ASD. Methods A sample of typically developing (TD) children (n = 34) and children with ASD (n = 45) performed the Reading the Mind in the Eyes Task (RMET), preceded and followed by periods of baseline movie-watching. Multiscale Entropy (MSE) was employed as a new tool to examine the complexity of the cardiac signal. Results Significant group differences in MSE emerged to suggest atypicality in the regularity of the autonomic signal at short and long time scales in the ASD group during the RMET task. Conclusions For the RMET task, our results may suggest atypical activation of parasympathetic influences on the heart, which contributes to short-term patterns in the heartbeat signal, as well as atypicalities in the slower acting processes. Results also suggest that the coupling between the fast-acting and slow-acting influences may be atypical in ASD during the examined social cognition task. En ligne : https://doi.org/10.1016/j.rasd.2017.04.004 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=308 [article] Atypical autonomic nervous system complexity accompanies social cognition task performance in ASD [texte imprimé] / Hamidreza SAGHIR, Auteur ; Annie DUPUIS, Auteur ; Tom CHAU, Auteur ; Azadeh KUSHKI, Auteur . - p.54-62. Langues : Anglais (eng) in Research in Autism Spectrum Disorders > 39 (July 2017) . - p.54-62 Mots-clés : Autism spectrum disorder  Autonomic nervous system  Complexity analysis  Social cognition  RMET  Theory of mind  ASD in children Index. décimale : PER Périodiques Résumé : AbstractBackground Emerging evidence suggests that autonomic nervous system (ANS) function is affected in ASD. Existing literature has focused on quantifying the activity of ANS components (i.e. sympathetic/parasympathetic systems) individually. To this end, measures such as respiratory sinus arrhythmia (RSA) and high- and low-frequency spectral components of heart rate variability have been employed. Recent findings indicate that these methods employ assumptions that do not fully consider the complexity of the ANS system and the interaction of its components. To this end, we propose a new method for examining ANS function in ASD. Methods A sample of typically developing (TD) children (n = 34) and children with ASD (n = 45) performed the Reading the Mind in the Eyes Task (RMET), preceded and followed by periods of baseline movie-watching. Multiscale Entropy (MSE) was employed as a new tool to examine the complexity of the cardiac signal. Results Significant group differences in MSE emerged to suggest atypicality in the regularity of the autonomic signal at short and long time scales in the ASD group during the RMET task. Conclusions For the RMET task, our results may suggest atypical activation of parasympathetic influences on the heart, which contributes to short-term patterns in the heartbeat signal, as well as atypicalities in the slower acting processes. Results also suggest that the coupling between the fast-acting and slow-acting influences may be atypical in ASD during the examined social cognition task. En ligne : https://doi.org/10.1016/j.rasd.2017.04.004 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=308

Brief Report: Classification of Autistic Traits According to Brain Activity Recoded by fNIRS Using ε-Complexity Coefficients / Anat DAHAN in Journal of Autism and Developmental Disorders, 51-9 (September 2021)  

Public ISBD [article]  inJournal of Autism and Developmental Disorders > 51-9 (September 2021) . - p.3380-3390 Titre : Brief Report: Classification of Autistic Traits According to Brain Activity Recoded by fNIRS Using ε-Complexity Coefficients Type de document : texte imprimé Auteurs : Anat DAHAN, Auteur ; Yuri A. DUBNOV, Auteur ; Alexey Y. POPKOV, Auteur ; Itai GUTMAN, Auteur ; Hila Gvirts PROBOLOVSKI, Auteur Article en page(s) : p.3380-3390 Langues : Anglais (eng) Mots-clés : Autism Spectrum Disorder/diagnosis  Autistic Disorder  Brain/diagnostic imaging  Brain Mapping  Humans  Autistic traits  Classification  Complexity  Interpersonal synchronization  fNIRS Index. décimale : PER Périodiques Résumé : Individuals with ASD have been shown to have different pattern of functional connectivity. In this study, brain activity of participants with many and few autistic traits, was recorded using an fNIRS device, as participants preformed an interpersonal synchronization task. This type of task involves synchronization and functional connectivity of different brain regions. A novel method for assessing signal complexity, using ε-complexity coefficients, applied for the first i.e. on fNIRS recording, was used to classify brain recording of participants with many/few autistic traits. Successful classification was achieved implying that this method may be useful for classification of fNIRS recordings and that there is a difference in brain activity between participants with low and high autistic traits as they perform an interpersonal synchronization task. En ligne : http://dx.doi.org/10.1007/s10803-020-04793-w Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=453 [article] Brief Report: Classification of Autistic Traits According to Brain Activity Recoded by fNIRS Using ε-Complexity Coefficients [texte imprimé] / Anat DAHAN, Auteur ; Yuri A. DUBNOV, Auteur ; Alexey Y. POPKOV, Auteur ; Itai GUTMAN, Auteur ; Hila Gvirts PROBOLOVSKI, Auteur . - p.3380-3390. Langues : Anglais (eng) in Journal of Autism and Developmental Disorders > 51-9 (September 2021) . - p.3380-3390 Mots-clés : Autism Spectrum Disorder/diagnosis  Autistic Disorder  Brain/diagnostic imaging  Brain Mapping  Humans  Autistic traits  Classification  Complexity  Interpersonal synchronization  fNIRS Index. décimale : PER Périodiques Résumé : Individuals with ASD have been shown to have different pattern of functional connectivity. In this study, brain activity of participants with many and few autistic traits, was recorded using an fNIRS device, as participants preformed an interpersonal synchronization task. This type of task involves synchronization and functional connectivity of different brain regions. A novel method for assessing signal complexity, using ε-complexity coefficients, applied for the first i.e. on fNIRS recording, was used to classify brain recording of participants with many/few autistic traits. Successful classification was achieved implying that this method may be useful for classification of fNIRS recordings and that there is a difference in brain activity between participants with low and high autistic traits as they perform an interpersonal synchronization task. En ligne : http://dx.doi.org/10.1007/s10803-020-04793-w Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=453

Brief Report: Effect of Spatial Complexity on Visual Short-Term Memory and Self-Reported Autistic-Like Traits in Typically Developed Individuals / Junichi TAKAHASHI in Journal of Autism and Developmental Disorders, 43-7 (July 2013)  

Public ISBD [article]  inJournal of Autism and Developmental Disorders > 43-7 (July 2013) . - p.1725-1731 Titre : Brief Report: Effect of Spatial Complexity on Visual Short-Term Memory and Self-Reported Autistic-Like Traits in Typically Developed Individuals Type de document : texte imprimé Auteurs : Junichi TAKAHASHI, Auteur ; Jiro GYOBA, Auteur ; Nozomi YAMAWAKI, Auteur Année de publication : 2013 Article en page(s) : p.1725-1731 Langues : Anglais (eng) Mots-clés : Autism  Autism spectrum quotient  Visual short-term memory  Complexity  Spatial configuration Index. décimale : PER Périodiques Résumé : This report examines effects of the spatial complexity of configurations on visual short-term memory (VSTM) capacity for individuals from the general population differing on autism-spectrum quotient (AQ) scores. During each trial, nine-line segments with various orientations were arrayed in simple or complex configurations and presented in both memory and test displays. Typically, VSTM capacity decreases with increasing configuration complexity. We found that VSTM capacity for simple configurations was larger than for complex configurations in individuals reporting low AQ, whereas for individuals reporting high AQ, there were no significant differences between these configurations. These results suggest that the effects of spatial complexity on VSTM capacity could be observed in individuals reporting low AQ, but not in individuals reporting high AQ. En ligne : http://dx.doi.org/10.1007/s10803-012-1711-9 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=202 [article] Brief Report: Effect of Spatial Complexity on Visual Short-Term Memory and Self-Reported Autistic-Like Traits in Typically Developed Individuals [texte imprimé] / Junichi TAKAHASHI, Auteur ; Jiro GYOBA, Auteur ; Nozomi YAMAWAKI, Auteur . - 2013 . - p.1725-1731. Langues : Anglais (eng) in Journal of Autism and Developmental Disorders > 43-7 (July 2013) . - p.1725-1731 Mots-clés : Autism  Autism spectrum quotient  Visual short-term memory  Complexity  Spatial configuration Index. décimale : PER Périodiques Résumé : This report examines effects of the spatial complexity of configurations on visual short-term memory (VSTM) capacity for individuals from the general population differing on autism-spectrum quotient (AQ) scores. During each trial, nine-line segments with various orientations were arrayed in simple or complex configurations and presented in both memory and test displays. Typically, VSTM capacity decreases with increasing configuration complexity. We found that VSTM capacity for simple configurations was larger than for complex configurations in individuals reporting low AQ, whereas for individuals reporting high AQ, there were no significant differences between these configurations. These results suggest that the effects of spatial complexity on VSTM capacity could be observed in individuals reporting low AQ, but not in individuals reporting high AQ. En ligne : http://dx.doi.org/10.1007/s10803-012-1711-9 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=202

Context processing in adolescents with autism spectrum disorder: How complex could it be? / Dekel BEN-YOSEF in Autism Research, 10-3 (March 2017)  

Public ISBD [article]  inAutism Research > 10-3 (March 2017) . - p.520-530 Titre : Context processing in adolescents with autism spectrum disorder: How complex could it be? Type de document : texte imprimé Auteurs : Dekel BEN-YOSEF, Auteur ; David ANAKI, Auteur ; Ofer GOLAN, Auteur Article en page(s) : p.520-530 Langues : Anglais (eng) Mots-clés : autism spectrum disorder  context processing  priming  central coherence  social cognition  complexity Index. décimale : PER Périodiques Résumé : The ability of individuals with Autism Spectrum Disorder (ASD) to process context has long been debated: According to the Weak Central Coherence theory, ASD is characterized by poor global processing, and consequently—poor context processing. In contrast, the Social Cognition theory argues individuals with ASD will present difficulties only in social context processing. The complexity theory of autism suggests context processing in ASD will depend on task complexity. The current study examined this controversy through two priming tasks, one presenting human stimuli (facial expressions) and the other presenting non-human stimuli (animal faces). Both tasks presented visual targets, preceded by congruent, incongruent, or neutral auditory primes. Local and global processing were examined by presenting the visual targets in three spatial frequency conditions: High frequency, low frequency, and broadband. Tasks were administered to 16 adolescents with high functioning ASD and 16 matched typically developing adolescents. Reaction time and accuracy were measured for each task in each condition. Results indicated that individuals with ASD processed context for both human and non-human stimuli, except in one condition, in which human stimuli had to be processed globally (i.e., target presented in low frequency). The task demands presented in this condition, and the performance deficit shown in the ASD group as a result, could be understood in terms of cognitive overload. These findings provide support for the complexity theory of autism and extend it. Our results also demonstrate how associative priming could support intact context processing of human and non-human stimuli in individuals with ASD. En ligne : http://dx.doi.org/10.1002/aur.1676 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=304 [article] Context processing in adolescents with autism spectrum disorder: How complex could it be? [texte imprimé] / Dekel BEN-YOSEF, Auteur ; David ANAKI, Auteur ; Ofer GOLAN, Auteur . - p.520-530. Langues : Anglais (eng) in Autism Research > 10-3 (March 2017) . - p.520-530 Mots-clés : autism spectrum disorder  context processing  priming  central coherence  social cognition  complexity Index. décimale : PER Périodiques Résumé : The ability of individuals with Autism Spectrum Disorder (ASD) to process context has long been debated: According to the Weak Central Coherence theory, ASD is characterized by poor global processing, and consequently—poor context processing. In contrast, the Social Cognition theory argues individuals with ASD will present difficulties only in social context processing. The complexity theory of autism suggests context processing in ASD will depend on task complexity. The current study examined this controversy through two priming tasks, one presenting human stimuli (facial expressions) and the other presenting non-human stimuli (animal faces). Both tasks presented visual targets, preceded by congruent, incongruent, or neutral auditory primes. Local and global processing were examined by presenting the visual targets in three spatial frequency conditions: High frequency, low frequency, and broadband. Tasks were administered to 16 adolescents with high functioning ASD and 16 matched typically developing adolescents. Reaction time and accuracy were measured for each task in each condition. Results indicated that individuals with ASD processed context for both human and non-human stimuli, except in one condition, in which human stimuli had to be processed globally (i.e., target presented in low frequency). The task demands presented in this condition, and the performance deficit shown in the ASD group as a result, could be understood in terms of cognitive overload. These findings provide support for the complexity theory of autism and extend it. Our results also demonstrate how associative priming could support intact context processing of human and non-human stimuli in individuals with ASD. En ligne : http://dx.doi.org/10.1002/aur.1676 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=304

Differences in the Efficiency of Pattern Encoding in Relation to Autistic-Like Traits: An Event-Related Potential Study / Junichi TAKAHASHI in Journal of Autism and Developmental Disorders, 44-11 (November 2014)  

Public ISBD [article]  inJournal of Autism and Developmental Disorders > 44-11 (November 2014) . - p.2895-2907 Titre : Differences in the Efficiency of Pattern Encoding in Relation to Autistic-Like Traits: An Event-Related Potential Study Type de document : texte imprimé Auteurs : Junichi TAKAHASHI, Auteur ; Daichi YASUNAGA, Auteur ; Jiro GYOBA, Auteur Article en page(s) : p.2895-2907 Langues : Anglais (eng) Mots-clés : Autism spectrum quotient  Complexity  Encoding efficiency  Event-related potential Index. décimale : PER Périodiques Résumé : We examined the effects of complexity on the efficiency of pattern encoding in the general population differing on autism-spectrum quotient (AQ) scores. We compared brain activity (electroencephalography) during a same-different task for High and Low AQ groups. The task was composed of identical comparison and categorical comparison (CC) conditions that presented simple or complex patterns. In the CC condition, the Low AQ showed large P3b amplitudes with simple patterns than with complex patterns, whereas the High AQ showed the same amplitude levels for these patterns. These indicate that, similar to simple patterns, complex patterns are efficiently encoded in the High AQ. Moreover, the High AQ had no impairment in the global pattern encoding compared with the Low AQ. En ligne : http://dx.doi.org/10.1007/s10803-014-2150-6 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=241 [article] Differences in the Efficiency of Pattern Encoding in Relation to Autistic-Like Traits: An Event-Related Potential Study [texte imprimé] / Junichi TAKAHASHI, Auteur ; Daichi YASUNAGA, Auteur ; Jiro GYOBA, Auteur . - p.2895-2907. Langues : Anglais (eng) in Journal of Autism and Developmental Disorders > 44-11 (November 2014) . - p.2895-2907 Mots-clés : Autism spectrum quotient  Complexity  Encoding efficiency  Event-related potential Index. décimale : PER Périodiques Résumé : We examined the effects of complexity on the efficiency of pattern encoding in the general population differing on autism-spectrum quotient (AQ) scores. We compared brain activity (electroencephalography) during a same-different task for High and Low AQ groups. The task was composed of identical comparison and categorical comparison (CC) conditions that presented simple or complex patterns. In the CC condition, the Low AQ showed large P3b amplitudes with simple patterns than with complex patterns, whereas the High AQ showed the same amplitude levels for these patterns. These indicate that, similar to simple patterns, complex patterns are efficiently encoded in the High AQ. Moreover, the High AQ had no impairment in the global pattern encoding compared with the Low AQ. En ligne : http://dx.doi.org/10.1007/s10803-014-2150-6 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=241

Editorial: Capturing the dynamics of development and psychopathology: from neural circuits to global trends / Pasco FEARON in Journal of Child Psychology and Psychiatry, 56-3 (March 2015)  

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Excessive and less complex body movement in children with autism during face-to-face conversation: An objective approach to behavioral quantification / Zhongbo ZHAO in Autism Research, 15-2 (February 2022)  

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Joint Analysis of Band-Specific Functional Connectivity and Signal Complexity in Autism / Yasser GHANBARI in Journal of Autism and Developmental Disorders, 45-2 (February 2015)  

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Atypical Gaze Cueing Pattern in a Complex Environment in Individuals with ASD / Shuo ZHAO in Journal of Autism and Developmental Disorders, 47-7 (July 2017)  

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Auditory spatial attention to speech and complex non-speech sounds in children with autism spectrum disorder / Laura N. SOSKEY in Autism Research, 10-8 (August 2017)  

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