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Effects of Combined and Separate Removals of Rostral Dorsal Superior Temporal Sulcus Cortex and Perirhinal Cortex on Visual Recognition Memory in Rhesus Monkeys

Laboratory of Neuropsychology, National Institute of Mental Health, Bethesda, Maryland 20892

Submitted 26 March 2003; accepted in final form 17 June 2003

The dorsal bank of the superior temporal sulcus (STSd) bears anatomical relations similar to those of perirhinal cortex, an area critical for visual recognition memory. To examine whether STSd makes a similar contribution to visual recognition memory, performance on visual delayed nonmatching-to-sample (DNMS) was assessed in rhesus monkeys with combined or separate ablations of the perirhinal cortex and STSd as well as in unoperated controls. Consistent with previous findings, ablations of perirhinal cortex produced deficits nearly as severe as that found after rhinal (i.e., entorhinal plus perirhinal) cortex lesions. However, combined lesions of perirhinal cortex and STSd produced a deficit no greater than that produced by perirhinal cortex ablation alone, and lesions of STSd alone were without effect on DNMS. We conclude that STSd is not critically involved in visual recognition memory.