Exploratory study of dorsal visual stream dysfunction in autism; A case series / I. HAY in Research in Autism Spectrum Disorders, 69 (January 2020)  

Public ISBD [article]  inResearch in Autism Spectrum Disorders > 69 (January 2020) . - p.101456 Titre : Exploratory study of dorsal visual stream dysfunction in autism; A case series Type de document : Texte imprimé et/ou numérique Auteurs : I. HAY, Auteur ; G. N. DUTTON, Auteur ; S. BIGGAR, Auteur ; H. IBRAHIM, Auteur ; D. ASSHETON, Auteur Article en page(s) : p.101456 Langues : Anglais (eng) Mots-clés : Dorsal visual stream dysfunction  Cerebral visual impairment  motor impairment  Autism Index. décimale : PER Périodiques Résumé : Background Robust neuroscientific evidence supports the existence of an association between autism and a visual motion processing deficit, arising from dysfunction of the dorsal visual stream, a pathway connecting the primary visual and parieto-occipital cortices. The neuro-ophthalmic consequences of dorsal visual stream dysfunction (DVSD) are well-described but seldom reported: simultanagnosia, optic ataxia (OA), and gaze apraxia. Method The clinical records of thirteen motor-impaired autistic children, with clinical diagnoses of DVSD, were retrospectively reviewed six years after DVSD diagnosis to determine the frequency and severity of their neuro-visual impairment. Two measures to rate severity of visual perceptual impairment were employed: frequency of parent-reported behaviours denoting impaired visual function, given as mean individual Cerebral Visual Impairment Inventory Scores (CVIS), and severity of age-inappropriate configural disruption of drawings, rated on Beery-VMI Visual Motor Integration standard scores (VMIS). Applying the 90th percentile cut-off CVIS of 0.74 for the typical population as marker of normal visual function a CVIS???2.5 indicated very severe impairment. Evidence was also sought for a correlation between central OA and severe motor coordination impairment (MCI), rated by the Beery Motor Coordination assessment, using method agreement analysis. Results Significant correlation between CVIS and VMIS was determined by linear regression analysis: r = -0.81 [95% CI -0.94 to -0.47], p=0.0008. Agreement for MCI? 5th percentile with central OA, determined by Cohen’s weighted Kappa statistic (K), was significant: K?=?1[95% CI: 0.46–1.54], p=0.0002. Conclusions We conclude that mechanisms driving OA (which is defined as ‘impaired visually guided movement’) may underpin severe motor impairment, in autism. CVIS and VMIS may be useful indicators of severity of spatial cognitive impairment. En ligne : https://doi.org/10.1016/j.rasd.2019.101456 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=412 [article] Exploratory study of dorsal visual stream dysfunction in autism; A case series [Texte imprimé et/ou numérique] / I. HAY, Auteur ; G. N. DUTTON, Auteur ; S. BIGGAR, Auteur ; H. IBRAHIM, Auteur ; D. ASSHETON, Auteur . - p.101456. Langues : Anglais (eng) in Research in Autism Spectrum Disorders > 69 (January 2020) . - p.101456 Mots-clés : Dorsal visual stream dysfunction  Cerebral visual impairment  motor impairment  Autism Index. décimale : PER Périodiques Résumé : Background Robust neuroscientific evidence supports the existence of an association between autism and a visual motion processing deficit, arising from dysfunction of the dorsal visual stream, a pathway connecting the primary visual and parieto-occipital cortices. The neuro-ophthalmic consequences of dorsal visual stream dysfunction (DVSD) are well-described but seldom reported: simultanagnosia, optic ataxia (OA), and gaze apraxia. Method The clinical records of thirteen motor-impaired autistic children, with clinical diagnoses of DVSD, were retrospectively reviewed six years after DVSD diagnosis to determine the frequency and severity of their neuro-visual impairment. Two measures to rate severity of visual perceptual impairment were employed: frequency of parent-reported behaviours denoting impaired visual function, given as mean individual Cerebral Visual Impairment Inventory Scores (CVIS), and severity of age-inappropriate configural disruption of drawings, rated on Beery-VMI Visual Motor Integration standard scores (VMIS). Applying the 90th percentile cut-off CVIS of 0.74 for the typical population as marker of normal visual function a CVIS???2.5 indicated very severe impairment. Evidence was also sought for a correlation between central OA and severe motor coordination impairment (MCI), rated by the Beery Motor Coordination assessment, using method agreement analysis. Results Significant correlation between CVIS and VMIS was determined by linear regression analysis: r = -0.81 [95% CI -0.94 to -0.47], p=0.0008. Agreement for MCI? 5th percentile with central OA, determined by Cohen’s weighted Kappa statistic (K), was significant: K?=?1[95% CI: 0.46–1.54], p=0.0002. Conclusions We conclude that mechanisms driving OA (which is defined as ‘impaired visually guided movement’) may underpin severe motor impairment, in autism. CVIS and VMIS may be useful indicators of severity of spatial cognitive impairment. En ligne : https://doi.org/10.1016/j.rasd.2019.101456 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=412

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