Fig. 4.

Behavioral data (manual dexterity) obtained from three representative monkeys (Mk-MO, Mk-VA and Mk-RO) for the Brinkman box task, performed with visual feedback. The manual dexterity of the ipsilesional hand is given by the total time needed by the monkey to empty the 20 wells. Along the abscissa, the day of the M1 lesion is at time zero (vertical dashed line). The thick horizontal line is the average total time, computed from the pre-lesion daily sessions only. The horizontal dashed line is for the average total time plus 2SDs. For comparison, the total time is given in the small graphs on the right for the contralesional hand in each monkey (note the different scale in the ordinate). On the right, the post-lesion period shown on the graphs was set depending on the variable time course of recovery across monkeys. In the top graph (Mk-MO), the arrow points to a daily session in which the monkey took a lot of time to empty the box (probably due to poor motivation on that day), thus representing an outlier data point