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Volume 16, Number 14, Issue of July 15, 1996 pp. 4501-4517
Copyright ©1996 Society for Neuroscience

The Effects of Superior Temporal Cortex Lesions on the Processing and Retention of Auditory Information in Monkeys (Cebus apella)

Received Dec. 14, 1995; revised April 22, 1996; accepted May 3, 1996.

Michael Colombo¹, Hillary R. Rodman², and Charles G. Gross²

¹ Department of Psychology, Rutgers University, New Brunswick, New Jersey 08903, and ² Department of Psychology, Princeton University, Princeton, New Jersey 08544

Three monkeys with extensive preoperative training on visual and auditory memory tasks (delayed matching-to-sample), an auditory pattern-discrimination task, and a visual serial-order task, received bilateral lesions of the superior temporal (ST) cortex in two stages, with testing after each lesion. Unilateral ST cortex lesions resulted in only moderate auditory memory impairments, whereas bilateral ST cortex lesions resulted in severe auditory memory impairments. The bilateral ST cortex lesions also resulted in severe impairments in the ability to relearn the auditory pattern-discrimination task. In contrast to the auditory impairments, neither unilateral nor bilateral ST cortex lesions had any effect whatsoever on either visual memory or visual serial-order behavior. These findings indicate that the ST cortex plays a role in auditory processing and retention similar to that played by the inferior temporal cortex for visual processing and retention.

Key words: auditory cortex; auditory memory; visual memory; delayed matching-to-sample; serial-order task; pattern discrimination; frequency discrimination

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