Centre d'Information et de documentation du CRA Rhône-Alpes
CRA
Informations pratiques
-
Adresse
Centre d'information et de documentation
du CRA Rhône-Alpes
Centre Hospitalier le Vinatier
bât 211
95, Bd Pinel
69678 Bron CedexHoraires
Lundi au Vendredi
9h00-12h00 13h30-16h00Contact
Tél: +33(0)4 37 91 54 65
Mail
Fax: +33(0)4 37 91 54 37
-
Résultat de la recherche
3 recherche sur le mot-clé 'low-level perception'
Affiner la recherche Générer le flux rss de la recherche
Partager le résultat de cette recherche Faire une suggestion
The developmental trajectory of contrast sensitivity in autism spectrum disorder / Jacalyn GUY in Autism Research, 9-8 (August 2016)
[article]
Titre : The developmental trajectory of contrast sensitivity in autism spectrum disorder Type de document : Texte imprimé et/ou numérique Auteurs : Jacalyn GUY, Auteur ; Laurent MOTTRON, Auteur ; Claude BERTHIAUME, Auteur ; Armando BERTONE, Auteur Article en page(s) : p.866-878 Langues : Anglais (eng) Mots-clés : autism spectrum disorder low-level perception development spatial frequency contrast sensitivity Index. décimale : PER Périodiques Résumé : Autism Spectrum Disorder (ASD) is characterized by a detail-driven visual processing strategy, evidence for which has been based largely on cross-sectional studies in small participant groups of limited age ranges. It is therefore unknown when sensitivity to detailed information emerges and develops in ASD. Contrast sensitivity to sinusoidal gratings of different spatial frequencies (0.5, 1, 2, 4, and 8 cycles per degree (cpd)) was measured for 34 participants with ASD and 55 typically developing participants (aged 6–16 years). Cross-sectional, developmental trajectories were constructed to examine within and between group differences across the range of spatial frequencies tested. Developmental trajectories indicated that sensitivity across low (i.e., 0.5 and 1 cpd) and mid (2 and 4 cpd) spatial frequencies varied by chronological age within each group, with mid frequencies developing at a more significant rate than low frequencies. There was no overall difference between groups in terms of the relationship of sensitivity and age across spatial frequencies, yet the ASD group had an overall lower level of sensitivity. Closer examination revealed that the youngest participants with ASD had a reduced sensitivity for mid frequencies. Moreover, the ASD group showed a statistically significant developmental relationship at 8 cpd, which suggests that a trend for increased sensitivity to early detailed information may manifest beyond the ages tested. These findings demonstrate a differential development of contrast sensitivity for spatial frequencies in ASD and underscore the need to better identify what drives such differences in the “building blocks” of visual perception. Autism Res 2016, 9: 866–878. © 2015 En ligne : http://dx.doi.org/10.1002/aur.1579 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=293
in Autism Research > 9-8 (August 2016) . - p.866-878[article] The developmental trajectory of contrast sensitivity in autism spectrum disorder [Texte imprimé et/ou numérique] / Jacalyn GUY, Auteur ; Laurent MOTTRON, Auteur ; Claude BERTHIAUME, Auteur ; Armando BERTONE, Auteur . - p.866-878.
Langues : Anglais (eng)
in Autism Research > 9-8 (August 2016) . - p.866-878
Mots-clés : autism spectrum disorder low-level perception development spatial frequency contrast sensitivity Index. décimale : PER Périodiques Résumé : Autism Spectrum Disorder (ASD) is characterized by a detail-driven visual processing strategy, evidence for which has been based largely on cross-sectional studies in small participant groups of limited age ranges. It is therefore unknown when sensitivity to detailed information emerges and develops in ASD. Contrast sensitivity to sinusoidal gratings of different spatial frequencies (0.5, 1, 2, 4, and 8 cycles per degree (cpd)) was measured for 34 participants with ASD and 55 typically developing participants (aged 6–16 years). Cross-sectional, developmental trajectories were constructed to examine within and between group differences across the range of spatial frequencies tested. Developmental trajectories indicated that sensitivity across low (i.e., 0.5 and 1 cpd) and mid (2 and 4 cpd) spatial frequencies varied by chronological age within each group, with mid frequencies developing at a more significant rate than low frequencies. There was no overall difference between groups in terms of the relationship of sensitivity and age across spatial frequencies, yet the ASD group had an overall lower level of sensitivity. Closer examination revealed that the youngest participants with ASD had a reduced sensitivity for mid frequencies. Moreover, the ASD group showed a statistically significant developmental relationship at 8 cpd, which suggests that a trend for increased sensitivity to early detailed information may manifest beyond the ages tested. These findings demonstrate a differential development of contrast sensitivity for spatial frequencies in ASD and underscore the need to better identify what drives such differences in the “building blocks” of visual perception. Autism Res 2016, 9: 866–878. © 2015 En ligne : http://dx.doi.org/10.1002/aur.1579 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=293 Keeping time in the brain: Autism spectrum disorder and audiovisual temporal processing / Ryan A. STEVENSON in Autism Research, 9-7 (July 2016)
[article]
Titre : Keeping time in the brain: Autism spectrum disorder and audiovisual temporal processing Type de document : Texte imprimé et/ou numérique Auteurs : Ryan A. STEVENSON, Auteur ; Magali SEGERS, Auteur ; Susanne FERBER, Auteur ; Morgan D. BARENSE, Auteur ; Stephen M. CAMARATA, Auteur ; Mark T. WALLACE, Auteur Article en page(s) : p.720-738 Langues : Anglais (eng) Mots-clés : low-level perception cognitive neuroscience developmental psychology social cognition Index. décimale : PER Périodiques Résumé : A growing area of interest and relevance in the study of autism spectrum disorder (ASD) focuses on the relationship between multisensory temporal function and the behavioral, perceptual, and cognitive impairments observed in ASD. Atypical sensory processing is becoming increasingly recognized as a core component of autism, with evidence of atypical processing across a number of sensory modalities. These deviations from typical processing underscore the value of interpreting ASD within a multisensory framework. Furthermore, converging evidence illustrates that these differences in audiovisual processing may be specifically related to temporal processing. This review seeks to bridge the connection between temporal processing and audiovisual perception, and to elaborate on emerging data showing differences in audiovisual temporal function in autism. We also discuss the consequence of such changes, the specific impact on the processing of different classes of audiovisual stimuli (e.g. speech vs. nonspeech, etc.), and the presumptive brain processes and networks underlying audiovisual temporal integration. Finally, possible downstream behavioral implications, and possible remediation strategies are outlined. Autism Res 2016, 9: 720–738. © 2015 International Society for Autism Research, Wiley Periodicals, Inc. En ligne : http://dx.doi.org/10.1002/aur.1566 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=292
in Autism Research > 9-7 (July 2016) . - p.720-738[article] Keeping time in the brain: Autism spectrum disorder and audiovisual temporal processing [Texte imprimé et/ou numérique] / Ryan A. STEVENSON, Auteur ; Magali SEGERS, Auteur ; Susanne FERBER, Auteur ; Morgan D. BARENSE, Auteur ; Stephen M. CAMARATA, Auteur ; Mark T. WALLACE, Auteur . - p.720-738.
Langues : Anglais (eng)
in Autism Research > 9-7 (July 2016) . - p.720-738
Mots-clés : low-level perception cognitive neuroscience developmental psychology social cognition Index. décimale : PER Périodiques Résumé : A growing area of interest and relevance in the study of autism spectrum disorder (ASD) focuses on the relationship between multisensory temporal function and the behavioral, perceptual, and cognitive impairments observed in ASD. Atypical sensory processing is becoming increasingly recognized as a core component of autism, with evidence of atypical processing across a number of sensory modalities. These deviations from typical processing underscore the value of interpreting ASD within a multisensory framework. Furthermore, converging evidence illustrates that these differences in audiovisual processing may be specifically related to temporal processing. This review seeks to bridge the connection between temporal processing and audiovisual perception, and to elaborate on emerging data showing differences in audiovisual temporal function in autism. We also discuss the consequence of such changes, the specific impact on the processing of different classes of audiovisual stimuli (e.g. speech vs. nonspeech, etc.), and the presumptive brain processes and networks underlying audiovisual temporal integration. Finally, possible downstream behavioral implications, and possible remediation strategies are outlined. Autism Res 2016, 9: 720–738. © 2015 International Society for Autism Research, Wiley Periodicals, Inc. En ligne : http://dx.doi.org/10.1002/aur.1566 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=292 Children With Autism Show Reduced Somatosensory Response: An MEG Study / Elysa J. MARCO in Autism Research, 5-5 (October 2012)
[article]
Titre : Children With Autism Show Reduced Somatosensory Response: An MEG Study Type de document : Texte imprimé et/ou numérique Auteurs : Elysa J. MARCO, Auteur ; Kasra KHATIBI, Auteur ; Susanna S. HILL, Auteur ; Bryna SIEGEL, Auteur ; Monica S. ARROYO, Auteur ; Anne F. DOWLING, Auteur ; John M. NEUHAUS, Auteur ; Elliott H. SHERR, Auteur ; Leighton B N. HINKLEY, Auteur ; Srikantan S. NAGARAJAN, Auteur Article en page(s) : p.340-351 Langues : Anglais (eng) Mots-clés : cognitive neuroscience event related potential school age low-level perception magnetoencephalography Index. décimale : PER Périodiques Résumé : The neural underpinnings of sensory processing differences in autism remain poorly understood. This prospective magnetoencephalography (MEG) study investigates whether children with autism show atypical cortical activity in the primary somatosensory cortex (S1) in comparison with matched controls. Tactile stimuli were clearly detectable, and painless taps were applied to the distal phalanx of the second (D2) and third (D3) fingers of the right and left hands. Three tactile paradigms were administered: an oddball paradigm (standard taps to D3 at an interstimulus interval (ISI) of 0.33 and deviant taps to D2 with ISI ranging from 1.32?s to 1.64?s); a slow-rate paradigm (D2) with an ISI matching the deviant taps in the oddball paradigm; and a fast-rate paradigm (D2) with an ISI matching the standard taps in the oddball. Study subjects were boys (age 7–11 years) with and without autism disorder. Sensory behavior was quantified using the Sensory Profile questionnaire. Boys with autism exhibited smaller amplitude left hemisphere S1 response to slow and deviant stimuli during the right-hand paradigms. In post-hoc analysis, tactile behavior directly correlated with the amplitude of cortical response. Consequently, the children were re-categorized by degree of parent-report tactile sensitivity. This regrouping created a more robust distinction between the groups with amplitude diminution in the left and right hemispheres and latency prolongation in the right hemisphere in the deviant and slow-rate paradigms for the affected children. This study suggests that children with autism have early differences in somatosensory processing, which likely influence later stages of cortical activity from integration to motor response. Autism Res 2012, 5: 340–351. © 2012 International Society for Autism Research, Wiley Periodicals, Inc. En ligne : http://dx.doi.org/10.1002/aur.1247 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=183
in Autism Research > 5-5 (October 2012) . - p.340-351[article] Children With Autism Show Reduced Somatosensory Response: An MEG Study [Texte imprimé et/ou numérique] / Elysa J. MARCO, Auteur ; Kasra KHATIBI, Auteur ; Susanna S. HILL, Auteur ; Bryna SIEGEL, Auteur ; Monica S. ARROYO, Auteur ; Anne F. DOWLING, Auteur ; John M. NEUHAUS, Auteur ; Elliott H. SHERR, Auteur ; Leighton B N. HINKLEY, Auteur ; Srikantan S. NAGARAJAN, Auteur . - p.340-351.
Langues : Anglais (eng)
in Autism Research > 5-5 (October 2012) . - p.340-351
Mots-clés : cognitive neuroscience event related potential school age low-level perception magnetoencephalography Index. décimale : PER Périodiques Résumé : The neural underpinnings of sensory processing differences in autism remain poorly understood. This prospective magnetoencephalography (MEG) study investigates whether children with autism show atypical cortical activity in the primary somatosensory cortex (S1) in comparison with matched controls. Tactile stimuli were clearly detectable, and painless taps were applied to the distal phalanx of the second (D2) and third (D3) fingers of the right and left hands. Three tactile paradigms were administered: an oddball paradigm (standard taps to D3 at an interstimulus interval (ISI) of 0.33 and deviant taps to D2 with ISI ranging from 1.32?s to 1.64?s); a slow-rate paradigm (D2) with an ISI matching the deviant taps in the oddball paradigm; and a fast-rate paradigm (D2) with an ISI matching the standard taps in the oddball. Study subjects were boys (age 7–11 years) with and without autism disorder. Sensory behavior was quantified using the Sensory Profile questionnaire. Boys with autism exhibited smaller amplitude left hemisphere S1 response to slow and deviant stimuli during the right-hand paradigms. In post-hoc analysis, tactile behavior directly correlated with the amplitude of cortical response. Consequently, the children were re-categorized by degree of parent-report tactile sensitivity. This regrouping created a more robust distinction between the groups with amplitude diminution in the left and right hemispheres and latency prolongation in the right hemisphere in the deviant and slow-rate paradigms for the affected children. This study suggests that children with autism have early differences in somatosensory processing, which likely influence later stages of cortical activity from integration to motor response. Autism Res 2012, 5: 340–351. © 2012 International Society for Autism Research, Wiley Periodicals, Inc. En ligne : http://dx.doi.org/10.1002/aur.1247 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=183