Some possible parameters of photic reinforcement.

Abstract

Two experiement, alternating training days with test days, investigated the power of light increments and light decrements, respectively, to reinforce bar pressing in the rat. Both light increments (using a wider range of initial and consequent levels than in a previous experiment) and light decrements were reinforcing. In Experiment 1, scores of both experimental and control groups declined over 6 training days and over 6 test days, with the 2 groups progressively diverging. In both experiments, neither degree of change nor consequent level, separated factorially by manipulating initial levels, had a significant effect on the reward value of light changes.