The short-term memory for visual stimuli was tested in 17 chimpanzees, 7 females and 10 males, with the delayed matching-to-sample technique. A statistically significant superiority of females in matching accuracy was exhibited over an extended period of time and under at least two different retention intervals. The results were consistent with those obtained with rhesus monkeys on similar tasks. The possibility that this difference was attributable to factors other than experience was suggested.
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