The effect of the presence or absence of the Plexiglas shell portion of the bins used to encase learning set (LS) problem objects, as in the apparatus used by Rumbaugh and Rice (1962), was assessed with 2 groups of 5 squirrel monkeys in the learning of a single discrimination problem, 6-trial/problem LS training, and the learning of 10 LS problems to a criterion. It was determined that quite apart from the fact that the transparent shell prevents direct hand contact with the stimulus objects, the bins appear to have characteristics that render squirrel monkeys nearly learning-setless in a 6-trial LS training situation.
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