[article]
| Titre : |
Far visual acuity is unremarkable in autism: Do we need to focus on crowding? |
| Type de document : |
Texte imprimé et/ou numérique |
| Auteurs : |
Luc KEITA, Auteur ; Laurent MOTTRON, Auteur ; Armando BERTONE, Auteur |
| Année de publication : |
2010 |
| Article en page(s) : |
p.333-341 |
| Langues : |
Anglais (eng) |
| Mots-clés : |
autism vision acuity crowding neural lateral interactions |
| Index. décimale : |
PER Périodiques |
| Résumé : |
Although autism presents a unique perceptual phenotype defined in part by atypical (often enhanced) analysis of spatial information, few biologically plausible hypotheses have been advanced to explain its neural underpinnings. One plausible explanation is functional but altered lateral connectivity mediating early or local mechanisms selectively responsive to different stimulus attributes, including spatial frequency and contrast. The goal of the present study was first to assess far visual acuity in autism using Landolt-C optotypes defined by different local stimulus attributes. Second, we investigated whether acuity is differentially affected in autism when target optotypes are simultaneously presented with flanking stimuli at different distances. This typical detrimental “crowding effect” of flanking stimuli on target optotype discrimination is attributed to lateral inhibitory interaction of neurons encoding for visual properties of distracters close to the target. Results failed to demonstrate a between-group difference in acuity to Landolt-C optotypes, whether defined by luminance- or texture-contrast. However, the expected crowding effect at one gap-size opening distance was evidenced for the control group only; a small effect was observed for the autism group at two gap-size opening. These results suggest that although far visual acuity is unremarkable in autism, altered local lateral connectivity within early perceptual areas underlying spatial information processing in autism is atypical. Altered local lateral connectivity in autism might originate from an imbalance in excitatory/inhibitory neural signaling, resulting in changes regarding elementary feature extraction and subsequent downstream visual integration and visuo-spatial analysis. This notion is discussed within the context of characteristic lower- and higher-level perceptual processing in autism. |
| En ligne : |
http://dx.doi.org/10.1002/aur.164 |
| Permalink : |
https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=115 |
in Autism Research > 3-6 (December 2010) . - p.333-341
[article] Far visual acuity is unremarkable in autism: Do we need to focus on crowding? [Texte imprimé et/ou numérique] / Luc KEITA, Auteur ; Laurent MOTTRON, Auteur ; Armando BERTONE, Auteur . - 2010 . - p.333-341. Langues : Anglais ( eng) in Autism Research > 3-6 (December 2010) . - p.333-341
| Mots-clés : |
autism vision acuity crowding neural lateral interactions |
| Index. décimale : |
PER Périodiques |
| Résumé : |
Although autism presents a unique perceptual phenotype defined in part by atypical (often enhanced) analysis of spatial information, few biologically plausible hypotheses have been advanced to explain its neural underpinnings. One plausible explanation is functional but altered lateral connectivity mediating early or local mechanisms selectively responsive to different stimulus attributes, including spatial frequency and contrast. The goal of the present study was first to assess far visual acuity in autism using Landolt-C optotypes defined by different local stimulus attributes. Second, we investigated whether acuity is differentially affected in autism when target optotypes are simultaneously presented with flanking stimuli at different distances. This typical detrimental “crowding effect” of flanking stimuli on target optotype discrimination is attributed to lateral inhibitory interaction of neurons encoding for visual properties of distracters close to the target. Results failed to demonstrate a between-group difference in acuity to Landolt-C optotypes, whether defined by luminance- or texture-contrast. However, the expected crowding effect at one gap-size opening distance was evidenced for the control group only; a small effect was observed for the autism group at two gap-size opening. These results suggest that although far visual acuity is unremarkable in autism, altered local lateral connectivity within early perceptual areas underlying spatial information processing in autism is atypical. Altered local lateral connectivity in autism might originate from an imbalance in excitatory/inhibitory neural signaling, resulting in changes regarding elementary feature extraction and subsequent downstream visual integration and visuo-spatial analysis. This notion is discussed within the context of characteristic lower- and higher-level perceptual processing in autism. |
| En ligne : |
http://dx.doi.org/10.1002/aur.164 |
| Permalink : |
https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=115 |
|
Faire une suggestion Affiner la rechercheDiagnostic et remédiation d’un déficit d’inhibition des détails dans la dyslexie de surface / Nathalie BEDOIN
Far visual acuity is unremarkable in autism: Do we need to focus on crowding? / Luc KEITA in Autism Research, 3-6 (December 2010)
