Dexterity of the contralesional hand. Manual dexterity of the contralesional hand, assessed with the Brinkman-board task and given by the number of pellets retrieved during 45 sec. (ordinate) as a function of time (abscissa, day of the corresponding session). For each monkey, pre-lesion sessions were performed during the 2 months preceding the lesion (day 0; vertical line), as well as 2 months post-lesion. Squares are for the number of pellets retrieved from the horizontal slots and diamonds from the vertical slots. The triangles are for the sum of the horizontal and vertical slots.