Figure 1.

Effects of coactivation on discrimination thresholds (n = 16). Dots represent mean thresholds, boxes show the standard errors, and whiskers correspond to the standard deviation. Coactivation period (3 h) is indicated by an arrow. (Left) Shown are results from five consecutive sessions before coactivation. After the fifth session (precondition), coactivation was applied. Testing was continued for two consecutive sessions after coactivation. Note decrease in thresholds after coactivation (session 6, postcondition, P < 0.005 pre-post), but recovery of effects after 24 h of termination of coactivation (session 7) with continuation of stable pretest performance. (Right) Discrimination thresholds obtained for the control finger (index finger of the left hand that was not coactivated) on session 5 (precondition). Note lack of effects after coactivation of the right index finger (session 6, postcondition), indicating finger specificity of the coactivation protocol.