72 subjects were required to learn either an affirmation or a conjunction concept in which there were either three or four stimulus dimensions in the stimulus array. Post-feedback latencies were longer in the conjunction-concept groups but did not vary with number of dimensions. Response latencies were longer with more dimensions but did not vary between concepts. More trials were required to reach criterion in the conjunction-concept and four-dimension groups. These results suggest that problem difficulty does not uniquely affect post-feedback latencies and that each interval is used by the subject for different problem-solving operations.
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