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Abstract
An experiment is reported which was concerned with the influence of ageing and tins effects of precision of manipulation on the duration of movements. Two different age groups were compared on a task in which two dials had to be sot alternately. The precision required to adjust the dials was systematically varied. A marked increase with ago was noted in the time taken to adjust the dials, but a much smaller increase was observed in the time spent moving the hand from one dial to the other. The time taken to travel between the dials depended on the precision of both the preceding and the following manipulations.