Initial-consequent-change surface in light-contingent bar pressing.

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Abstract
An attempt was made to support the stimulus-change hypothesis in light-contingent bar pressing (LCBP) by examining the entire initial-consequent-change surface, a procedure which partially avoids the problem of confounding amount of change with initial and consequent levels. LCBP rate increased with increased amounts of change in either direction as the theory predicts. The change effect accounted for 70.8% of the nonerror variance, and the result was consistent across the surface, supporting the importance of the change variable rather than particular light intensities. The change effect did not endure past the 3rd day, after which nocturnal preferences were evident.

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