Figure 1.
A sample test trial block. The diagonally striped square is the prospective memory (PM) response icon and the letters “LS” are the icon for the learning-set task. The small circle is the cursor that monkeys control with the movement of the joystick. Contacting the LS icon with the cursor initiated a set of LS trials. The PM cue, a flashing thick border, could appear between any two of these trials. Contacting the PM icon resulted in either a large reward or large penalty, depending on whether a PM cue was presented in the previous LS trial-block.