Figure 8.
Gamma-range synchronization strengthens the attentional bias of network responses to multiple stimuli (transparent motion). A, Trial-averaged population activity in MT when two transparent motion components were simultaneously presented in the receptive field (Nt = 20), in the nonattended (gray), and attended with (green) and without (orange) random top-down latencies. Synchronized top-down inputs enhance attentional effects. Neurons are labeled on the x-axis according to their preferred direction (θN). B, The attentional bias is enhanced by interareal synchrony when attention is directed to the neuron's preferred direction of motion (circles, stimuli at 90° and −90°, neuron θN = 90°, attention at 90°; see A), and reduced when attention is focused to the neuron's null direction of motion (triangles, stimuli at 90° and −90°, neuron θN = −90°, attention at 90°; see A). The nonattention condition is plotted to observe the attentional bias magnitude (squares, stimuli at 90° and −90°, neuron θN = 90°; see A).