Successive and Concurrent Discrimination by Rock Squirrels and Squirrel Monkeys 1

Abstract

Groups of rock squirrels and squirrel monkeys were tested on discriminations which were grouped into lists of length 1 (successive presentation), 2, or 4 (concurrent presentation) problems each. All Ss received 16 runs through 360 problems equally divided among the three types of lists. List length had no significant effect on the over-all performance of the rock squirrels at any stage of learning. Increasing list length retarded the performance of the squirrel monkeys during the latter runs of each problem but not during the early runs. The squirrel monkeys showed a linear increase in stimulus perseveration with list length while the rock squirrels showed no evidence of this error factor for any list length.

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