The delayed reaction and memory in rats. I. Length of delay.

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Abstract
Rats were tested on a jumping apparatus affording jumps in four different directions. The rat was introduced into the apparatus in a restraining cage by which enforced delays preceding response could be made. Care was taken to control various sense cues which were extraneous to the problem. The maximum delay period was 6 minutes; this gave a 65% correct response, where chance was 25%. The author believes that with changes in method longer delays would be possible. No behavioral set of any kind was noted, the animals moving about during the delay and not showing any outward bodily orientation between the removal of the stimulus and the time of release for the response. The author concludes that a safe hypothesis is that the rats made use of a central rather than a peripheral process.

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