Response latency was examined during learning set performance of eight highly sophisticated monkeys. Latency was relatively very long on Trial 1 of each problem and uniformly short during Trials 2 to 6. There was no difference in latency on Trial 2 following correct (response to A+) and incorrect (response to B−) Trial 1 responses. For the second block of problems, where performance was stable, the correlation coefficient between per cent correct responses and latency on Trials 2 to 6 for the eight Ss was 0.86.
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