Figure 6.

Effects of pulse and interval on the first response after reinforcement. (A) Lever-press incidents with the 16-pulse train are plotted in relation to the last reinforcement incident and train duration. When presses shown in blue dots were emitted during the train duration (shown in yellow area) or during inter-reinforcement interval (gray area), they were not reinforced. The number on the right indicates inter-reinforcement intervals for the 10-min periods. (A') Mean presses that were reinforced and occurred during ongoing trains and intervals. (B) Mean lever-press speeds (1/latencies) of first and second presses after reinforcement incidents as a function of pulse and interval. ^*P < 0.005, significantly slower than the 0-, 1-, and 3-s interval values. ^$P < 0.005, significantly slower than its first response speed. (C) Mean percent of CR-schedule values. ^*P < 0.005, significantly greater than lever-press rate or reinforcement rate value for respective interval.