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An automated multiple choice test of short-term spatial memory for monkeys.

Since Hunter developed the delayed response test in 1913, it has been widely used in the study of memory, brain damage, and behavioral pharmacology. A major problem is that the usual dichotomous choice method allows the animal a 50% chance of being correct on any trial. Thus, it is necessary to average the results of many animals or many trials to obtain a reliable measure of accuracy. A few investigations (eg., Riopelle, 1959) have utilized manual multiple choice delayed response procedures, but these have been tedious to conduct and have not provided a measure of the degree of error. The present multiple choice procedure was designed to provide a semi-quantitative measure of the degree of error on a single trial.