Abstract
A group of nine rhesus monkeys with bilateral ablation of the cortex in and around the sulcus principalis were unimpaired relative to a group of xeven control animals when tested for the retention of a preoperatively learned indirect delayed reaction based upon a sign-differentiated position discrimination. Introduction of longer durations of delay and a change in the basic discrimination task also failed to reveal any deficit. A significant but transient loss appeared in frontals when an opaque screen was used during delays. The results were discussed in terms of certain anatomical and methodological features of the research.
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