Figure 4.

Population firing rate activity. A–D, Average activity of tuned multiunits from F5 (A, C, n = 244) and AIP (B, D, column, n = 210) in the delayed grasping task (A, B) and the brain control task (C, D) is presented for each combination of the unit's preferred and nonpreferred grip type and handle orientation. Epoch definitions are as in Figure 3; tuning was determined from delay activity by two-way ANOVA (p < 0.01). The dashed line within each movement epoch represents the mean time of hand rest release.