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Compared 9 male patients with Korsakoff's syndrome to 19 normal and 11 alcoholic control Ss on their threshold for recognition of words or patterns presented monocularly to the lateral visual fields. Ss were then tested on backward visual masking of the same (target) stimuli to determine the interstimulus interval (ISI) needed to escape the masking effect (critical ISI) in each lateral field. Threshold for recognition and critical ISI were elevated in Korsakoff Ss. For all Ss, the right visual field was superior to the left for word recognition but not for pattern recognition. The critical ISIs were shorter in the right visual field for both types of material, suggesting that the dominant hemisphere is more efficient in the early (iconic) stages of information processing. (22 ref.)

Thirty post-lobectomy patients operated on for relief of seizures due to temporal lobe epilepsy and six patients who had had implantation of depth electrodes only were assessed in terms of their speech and memory abilities. The results from two subtests of the Boston Diagnostic Aphasia Examination show no significant group differences on speech tests. On the other hand, patients with left or dominant temporal lobectomies showed a greater memory deficit than those operated upon on the right or non-dominant side. This difference was apparent on tests of both recent verbal memory and long-term memory.

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