Figure 4.

Modulation of the visual response by attention. A, Visual responses of an example TRN neuron when the monkey was instructed to attend to the visual stimulus (top recording) and when it attended to the auditory stimulus (bottom recording). Only responses for correct trials are shown. For each trial type, spike density plots are superimposed on the spike rasters. The spike density plot for visual attention trials is duplicated in the bottom panel to facilitate comparison between the two cases. The arrow in each panel indicates the peak visual response (before subtracting background activity). The peak visual response was greater when the monkey attended to the visual stimulus. B, Difference in response when the visual stimulus is attended. The black trace is the difference between the spike density plots in the top and bottom panels of A (visual attended − auditory attended).