Figure 1.

Task paradigm and recording sites. A, Picture of the handle. Two sensors in grooves (red circle, only one sensor visible) detected the execution of the precision grip, and a light barrier (red line) detected the insertion of the monkey hand into the handle during power grip execution. B, Representation of the time course of the delayed grasping task. The task is divided into four epochs: fixation, cue, planning, and movement. The entire task is performed in the dark except for the cue period in which the handle is visible and a colored LED indicates the grip type (power or precision). The lights are projected onto the middle of the handle through a half mirror. C, MRI section showing a coronal view of monkey J. Red line indicates the orientation of the recording chamber, white crosses indicate image artifacts from two titanium bone screws located within (not below) the skull. D, MRI section of the right hemisphere of monkey L in the plane of the recording chamber. Superimposed on the image are the recording sites in area F5 (yellow dots). E, Same as D for monkey J.