SOME EFFECTS OF COMBINED SDs1

Abstract
When the individual SD components of a multiple schedule were combined, their control over a response summated, thus increasing the response probability to a point over that controlled by either of the SDs independently. Summation was concluded to be a phenomenon relevant for operant as well as respondent stimulus control (Pavlov, in Kimble, 1960; Hull, 1943). The results of the present study appear to be a special case of the general SD enhancement effect demonstrated by Hanson (1959) and by Pierrel and Sherman (1960).

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