Figure 1.

(A) Set of possible stimulus shapes. Preliminary testing of each cell indicated which of these eight shapes was the most effective stimulus for that cell. The most effective shape was then used in all subsequent testing of the spatial properties of the cell. (B) Task design. After the monkey was stably fixating, the stimulus shape appeared randomly at one of eight peripheral locations. The monkey immediately made a saccade to the stimulus. Yellow highlighting indicates eye position and was not present in actual display. For each cell the stimulus shape was always the same, chosen in preliminary testing as the most effective stimulus for that cell. The trial epochs prior to the saccade (marked in green) provided cell responses to the same stimulus at different spatial locations. Data from that epoch was used to evaluate the cells’ spatial selectivity properties.