Fig. 7.

Perisaccadic activation and reaction times grouped by target distance. A, Data from Figure 6 have been sorted by distance from the center of gaze to the target before foveation (presaccadic target distance). The top curverepresents trials in which the target was acquired from between 1.5 and 4° (From ∼2 deg), and the bottom curve was acquired from trials in which the presaccadic target distance was from 10 to 14° (From ∼12 deg). Curves are average spike density estimates normalized to the peak activity in the isolated/effective condition (as in Fig. 6). The number of trials included in each curve was (from top tobottom) 286, 500, 584, 517, 339, and 168. Thegray area highlights the peak of the eccentricity-dependent early activation (20–70 msec after acquisition). B, Early peak activity and manual reaction times plotted against presaccadic target distance. The average activity between 20 and 70 msec after acquisition (A, gray region) systematically declined as a function of the distance of the target before it was acquired. Median reaction times, starting from the time the target was fixated (■), show that the amount of time necessary to identify the target after it was fixated correlated inversely with the activity observed in the early peak.