Table 4.

Hit rates (a fraction of successfully completed trials regardless of chosen hemifield) in the memory-guided saccade task, choice trials, dorsal pulvinar stimulation (mean ± SE across sessions)

Stimulation period onsetHit rate (%)
Both monkeysMonkey CMonkey L
Control (no stimulation)92 ± 489 ± 697 ± 2
−80 ms to Cue onset76 ± 4*78 ± 7*72 ± 1*
+80 ms from Cue onset93 ± 688 ± 1099 ± 1
−80 ms to Go89 ± 685 ± 995 ± 0
+80 ms from Go74 ± 15*67 ± 25*86 ± 4*
  • Similar to instructed trials, in two stimulation periods, −80 ms to cue onset and +80 ms from Go, there was a drop in performance (in bold and with asterisk, significant in at least one session, Fisher's exact test, Bonferroni corrected, p < 0.05). Note that because these were two-target free-choice trials, we did not assign aborted, incomplete trials to left or right choices; therefore, here, the trials are not divided into contraversive and ipsiversive. However, the plot of eye position trajectories in error trials, similar to Figure 9E for the instructed trials, demonstrated similar effects: saccades to the ipsiversive cue after the offset of early −80 ms stimulation and contraversive undershooting in +80 ms from Go late stimulation period (plot not shown).