Figure 4.

Attentional modulation of r_SC depends on location selectivity rather than on direction selectivity. A, Attention-related change in V1–MT r_SC (V1–MT r_SC when the monkey is attending to location 1 minus V1–MT r_SC when the monkey is attending to location 2) as a function of LSI for each V1 unit. The LSI is defined as the response of the V1 unit to a single, full contrast stimulus in location 1 minus the response to a single stimulus in location 2 divided by the sum. The data are binned such that 10% of V1–MT pairs fell in each bin. Error bars indicate SEM. B, Attention-related change in V1–MT r_SC (V1–MT r_SC when the monkey attended to the location that best drives the V1 cell minus V1–MT r_SC in the opposite attention condition) as a function of the DSI for the V1 unit. DSI is defined as the V1 unit's response to a single stimulus moving in the MT neuron's preferred direction minus the response to a single stimulus moving in the MT neuron's null direction divided by the sum. Conventions as in A.