Event-related potentials in children with specific visual cognitive disability.
Event-related potentials (ERPs) elicited by novel and well memorized non-verbal visual patterns were recorded over the right and left hemispheres from ten children with Specific Visual Cognitive Disability (SVCD) and ten matched Control subjects (C). ERPs of SVCD children were generally longer in latency (particularly N2) and decreased in amplitude (particularly P3) relative to the ERPs of Cs. No hemisphere differences were observed in the SVCD group, while the latency of N2 in the C group tended to be slightly shorter and the amplitude of P3 was significantly larger over the right than over the left hemisphere. The results are discussed in terms of deficits in visual learning and visual pattern analysis. The different hemispheric pattern in SVCD children as compared to Cs is suggested to be a symptom secondary to basic visual cognitive deficits.
Ciesielski
K T
KT
Department of Applied Sciences in Medicine, University of Alberta, Edmonton, Canada.
D000293:Adolescent; D002648:Child; D003072:Cognition Disorders / Q000503:physiopathology*; D004410:Dyslexia / Q000503:physiopathology; D005074:Evoked Potentials, Visual; D006801:Humans; D014796:Visual Perception / Q000502:physiology*