Figure 4. Normalized data for the group.

Data are shown for each subject following contract-test conditioning (□) and contract-long conditioning (▪), with data normalized to the average response from 15 trials following contract-test conditioning for each test stimulus (mean ± s.e.m.). In all subjects the size of the tendon reflex decreased after contract-long conditioning. One subject showed a significant change in the size of the H-reflex. In 5 subjects there was a small but significant change in the MEP (as indicated by the asterisks). All statistics were performed on non-normalized data with normalization conducted only for illustrative purposes.