Figure 3.

Object-specific facilitation of MEPs before memory-cued and visually driven grasp. An index of object specificity is calculated by dividing the average MEP for each object by the average MEP for both objects, and expressing the result as a percentage. Notice that these indices must sum to 100%, and the hypothesis of no object specificity predicts a value of 50%. Data are shown for single- (dashed line, diamond symbols) and paired-pulse (solid line, squares) TMS, for ADM (upper row) and 1DI (lower row). Note that object specificity of the MEP follows object specificity of EMG (Fig. 2) only for paired-pulse MEPs in the ADM muscle in the visually driven condition.