Auditory short-term memory in the Japanese monkey.

Auditory short-term memory in Japanese monkeys (Macaca fuscata) was studied using a GO/NO GO auditory delayed matching to sample task. Three temporal parameters: delay interval, intertrial interval and sample stimulus duration were manipulated. Delayed matching performance deteriorated as the delay interval was lengthened, and reached a near chance level at 16 sec. Longer intertrial intervals and sample duration ameliorated performance. When the number of the sample stimulus was increased to 3 tones to examine a serial position effect, a primary effect was not observed, although a recency effect was obtained. The fragility of auditory delayed matching performance was discussed.