Interhemispheric transfer of visual, auditory, tactile, and visuomotor information in children with hydrocephalus and partial agenesis of the corpus callosum

Interhemispheric transfer was examined in 13 normal controls and in 13 chil dren with hydrocephalus and partial agenesis of the corpus callosum involvi ng a missing splenium associated with spina bifida meningomyelocele and aqu eductal stenosis. Children with hydrocephalus demonstrated greater left vis ual-field superiority for forms indicative of difficulty in interhemispheri c transfer of visual information. Interhemispheric transfer time (ITT) was somewhat longer in the children with hydrocephalus, but neither the ITT tas k nor the dichotic listening and tactile naming tasks provided clear eviden ce of difficulties in callosal transfer. Sensory and perceptual control tas ks revealed similar visual acuity and monotic word perception but larger 2- point discrimination thresholds and poorer tactile matching.