Abstract
Fifty-three subjects were given a video block-design task, and measures were made of beat-to-beat latencies of heart rate both during the task and during a subsequent rest period. The results indicated a decreased heart rate variance in the puzzle-solving period when compared to heart rate in the resting period. In addition, relationships were found between heart rate and other response variances for males. The results are discussed in terms of a behavioral variability hypothesis of mild stress effects (Crow, 1977).
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