Abstract
The performance of 12 Ss (20-26 years of age) and of 12 Ss (50-57 years of age) were compared on a perceptual-motor task which could be varied in complexity. The dependent variable of major concern was the time taken in initiating the response. "... the effect of increased complexity of response on the performance of older Ss is to increase significantly the period of initiation at all levels of choice. This increased latency of response does not occur in younger Ss.".

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