Information processing deficits in hydrocephalic and letter reversal children.

Hydrocephalic, letter reversal and normal children were tested with a tactile matching-to-sample task, a tachistoscopic matching-to-sample task, and a dichotic listening paradigm. For hydrocephalics, intrahemispheric as well as interhemispheric errors occurred; the partial callosal hypothesis was not supported. Letter reversal children demonstrated an interhemispheric deficit only in tactile performance.