Figure 4.

Effects of directing attention to a colored motion stimulus outside the RF, separately for a direction and a color task. (A) Attending to the motion signal of a preferred-direction (red dotted trace) vs. nulldirection stimulus (black dotted trace) outside the RF enhances activity of MT neurons. Remarkably, the same modulation is evident if attention is directed to the color of these stimuli (solid traces). (B) Distribution of the strength of attentional modulation for the recorded population. Binning is based on the attentional index AI = (fr_pref − fr_null)/(fr_pref + fr_null), where fr represents the fi ring rate in the corresponding attentional condition. (C) Relation between the size of the attentional effects in the direction and the color task. Conventions as in Figure 3.