Figure 2.

Experiment 1. Mean instrumental learning curves for the Master and Yoked groups (A). Controllable stimulation (Master) induced a progressive increase in response duration as a function of training in spinally-transected rats (A). Subjects that received the same amount of stimulation independent of leg position (Yoked) failed to learn. Graph A depicts group averages for each 60 s bin over the 30 min testing period. Mean performance over the entire 30 min time period (+ the SEM) is depicted in (B). *p < 0.05.