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Auteur Andrew S. PAPADOPOULOS |
Documents disponibles écrits par cet auteur (2)



Irritability in boys with autism spectrum disorders: an investigation of physiological reactivity / Nina MIKITA in Journal of Child Psychology and Psychiatry, 56-10 (October 2015)
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Titre : Irritability in boys with autism spectrum disorders: an investigation of physiological reactivity Type de document : Texte imprimé et/ou numérique Auteurs : Nina MIKITA, Auteur ; Matthew J. HOLLOCKS, Auteur ; Andrew S. PAPADOPOULOS, Auteur ; Alexandra ASLANI, Auteur ; Simon HARRISON, Auteur ; Ellen LEIBENLUFT, Auteur ; Emily SIMONOFF, Auteur ; Argyris STRINGARIS, Auteur Article en page(s) : p.1118-1126 Langues : Anglais (eng) Mots-clés : Autism spectrum disorders irritability cortisol heart rate psychosocial stress test Index. décimale : PER Périodiques Résumé : Background Irritability in people with autism spectrum disorders (ASD) is common and impairing, yet its mechanisms remain understudied. We investigated symptom reporting and mechanisms of irritability in ASD, focusing on the relation between irritability and physiological stress responses. Methods Forty-seven unmedicated boys with high-functioning ASD (hfASD) and 23 typically developing boys aged 10–16 years completed a psychosocial stress test. Changes in cortisol, heart rate and heart rate variability throughout the test were recorded. Self- and parent-reported measures of irritability were obtained. Irritability symptom reporting in the hfASD group was compared to two groups of boys without ASD: highly irritable boys (severe mood dysregulation, SMD; n = 40) and healthy-control boys (HC; n = 30). Results Boys with hfASD scored significantly higher on irritability than HC boys, and they reported a pattern of irritability symptoms closely resembling that of boys with SMD. The internal consistency of irritability in hfASD was high by parent- and self-report. Although boys with hfASD showed significant stress-induced changes in cortisol and heart rate, those who rated themselves as highly irritable had lower cortisol levels throughout the test compared to those low on irritability. Participants rated as highly irritable by their parents showed blunted cortisol and heart rate responses to stress. The effects of irritability on heart rate, but not cortisol, were accounted for by trait anxiety. Conclusions Irritability can be measured reliably in hfASD and is associated with distinct biological responses to stress. En ligne : http://dx.doi.org/10.1111/jcpp.12382 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=269
in Journal of Child Psychology and Psychiatry > 56-10 (October 2015) . - p.1118-1126[article] Irritability in boys with autism spectrum disorders: an investigation of physiological reactivity [Texte imprimé et/ou numérique] / Nina MIKITA, Auteur ; Matthew J. HOLLOCKS, Auteur ; Andrew S. PAPADOPOULOS, Auteur ; Alexandra ASLANI, Auteur ; Simon HARRISON, Auteur ; Ellen LEIBENLUFT, Auteur ; Emily SIMONOFF, Auteur ; Argyris STRINGARIS, Auteur . - p.1118-1126.
Langues : Anglais (eng)
in Journal of Child Psychology and Psychiatry > 56-10 (October 2015) . - p.1118-1126
Mots-clés : Autism spectrum disorders irritability cortisol heart rate psychosocial stress test Index. décimale : PER Périodiques Résumé : Background Irritability in people with autism spectrum disorders (ASD) is common and impairing, yet its mechanisms remain understudied. We investigated symptom reporting and mechanisms of irritability in ASD, focusing on the relation between irritability and physiological stress responses. Methods Forty-seven unmedicated boys with high-functioning ASD (hfASD) and 23 typically developing boys aged 10–16 years completed a psychosocial stress test. Changes in cortisol, heart rate and heart rate variability throughout the test were recorded. Self- and parent-reported measures of irritability were obtained. Irritability symptom reporting in the hfASD group was compared to two groups of boys without ASD: highly irritable boys (severe mood dysregulation, SMD; n = 40) and healthy-control boys (HC; n = 30). Results Boys with hfASD scored significantly higher on irritability than HC boys, and they reported a pattern of irritability symptoms closely resembling that of boys with SMD. The internal consistency of irritability in hfASD was high by parent- and self-report. Although boys with hfASD showed significant stress-induced changes in cortisol and heart rate, those who rated themselves as highly irritable had lower cortisol levels throughout the test compared to those low on irritability. Participants rated as highly irritable by their parents showed blunted cortisol and heart rate responses to stress. The effects of irritability on heart rate, but not cortisol, were accounted for by trait anxiety. Conclusions Irritability can be measured reliably in hfASD and is associated with distinct biological responses to stress. En ligne : http://dx.doi.org/10.1111/jcpp.12382 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=269 Reduced activation in lateral prefrontal cortex and anterior cingulate during attention and cognitive control functions in medication-naïve adolescents with depression compared to controls / Rozmin HALARI in Journal of Child Psychology and Psychiatry, 50-3 (March 2009)
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Titre : Reduced activation in lateral prefrontal cortex and anterior cingulate during attention and cognitive control functions in medication-naïve adolescents with depression compared to controls Type de document : Texte imprimé et/ou numérique Auteurs : Rozmin HALARI, Auteur ; Eric FOMBONNE, Auteur ; Mima SIMIC, Auteur ; Michael BRAMMER, Auteur ; Katya RUBIA, Auteur ; Carmine M. PARIANTE, Auteur ; Andrew S. PAPADOPOULOS, Auteur ; Anthony CLEARE, Auteur Année de publication : 2009 Article en page(s) : p.307-316 Langues : Anglais (eng) Mots-clés : Depression adolescent FMRI cognitive-control executive functions Index. décimale : PER Périodiques Résumé : Background: There is increasing recognition of major depressive disorder (MDD) in adolescence. In adult MDD, abnormalities of fronto-striatal and fronto-cingulate circuitries mediating cognitive control functions have been implicated in the pathogenesis and been related to problems with controlling negative thoughts. No neuroimaging studies of cognitive control functions, however, exist in paediatric depression. This study investigated whether medication-naïve adolescents with MDD show abnormal brain activation of fronto-striatal and fronto-cingulate networks when performing tasks of attentional and cognitive control.
Methods: Event-related functional magnetic resonance imaging was used to compare brain activation between 21 medication-naïve adolescents with a first-episode of MDD aged 14–17 years and 21 healthy adolescents, matched for handedness, age, sex, demographics and IQ. Activation paradigms were tasks of selective attention (Simon task), attentional switching (Switch task), and motor response inhibition and error detection (Stop task).
Results: In all three tasks, adolescents with depression compared to healthy controls demonstrated reduced activation in task-relevant right dorsolateral (DLPFC), inferior prefrontal cortex (IFC) and anterior cingulate gyrus (ACG). Additional areas of relatively reduced activation were in the parietal lobes during the Stop and Switch tasks, putamen, insula and temporal lobes during the Switch task and precuneus during the Simon task.
Conclusions: This study shows first evidence that medication-naïve adolescents with MDD are characterised by abnormal function in ACG and right lateral prefrontal cortex during tasks of attention and performance monitoring, suggesting an early pathogenesis of these functional abnormalities attributed to MDD.En ligne : http://dx.doi.org/10.1111/j.1469-7610.2008.01972.x Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=719
in Journal of Child Psychology and Psychiatry > 50-3 (March 2009) . - p.307-316[article] Reduced activation in lateral prefrontal cortex and anterior cingulate during attention and cognitive control functions in medication-naïve adolescents with depression compared to controls [Texte imprimé et/ou numérique] / Rozmin HALARI, Auteur ; Eric FOMBONNE, Auteur ; Mima SIMIC, Auteur ; Michael BRAMMER, Auteur ; Katya RUBIA, Auteur ; Carmine M. PARIANTE, Auteur ; Andrew S. PAPADOPOULOS, Auteur ; Anthony CLEARE, Auteur . - 2009 . - p.307-316.
Langues : Anglais (eng)
in Journal of Child Psychology and Psychiatry > 50-3 (March 2009) . - p.307-316
Mots-clés : Depression adolescent FMRI cognitive-control executive functions Index. décimale : PER Périodiques Résumé : Background: There is increasing recognition of major depressive disorder (MDD) in adolescence. In adult MDD, abnormalities of fronto-striatal and fronto-cingulate circuitries mediating cognitive control functions have been implicated in the pathogenesis and been related to problems with controlling negative thoughts. No neuroimaging studies of cognitive control functions, however, exist in paediatric depression. This study investigated whether medication-naïve adolescents with MDD show abnormal brain activation of fronto-striatal and fronto-cingulate networks when performing tasks of attentional and cognitive control.
Methods: Event-related functional magnetic resonance imaging was used to compare brain activation between 21 medication-naïve adolescents with a first-episode of MDD aged 14–17 years and 21 healthy adolescents, matched for handedness, age, sex, demographics and IQ. Activation paradigms were tasks of selective attention (Simon task), attentional switching (Switch task), and motor response inhibition and error detection (Stop task).
Results: In all three tasks, adolescents with depression compared to healthy controls demonstrated reduced activation in task-relevant right dorsolateral (DLPFC), inferior prefrontal cortex (IFC) and anterior cingulate gyrus (ACG). Additional areas of relatively reduced activation were in the parietal lobes during the Stop and Switch tasks, putamen, insula and temporal lobes during the Switch task and precuneus during the Simon task.
Conclusions: This study shows first evidence that medication-naïve adolescents with MDD are characterised by abnormal function in ACG and right lateral prefrontal cortex during tasks of attention and performance monitoring, suggesting an early pathogenesis of these functional abnormalities attributed to MDD.En ligne : http://dx.doi.org/10.1111/j.1469-7610.2008.01972.x Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=719