Fig. 7.

Attention results from catch trials. Shading represents ± 1 SE. A and B: firing rate (A) and spike count correlation (r_sc; B) for fast-spiking (red) and regular-spiking (blue) cells when the stimulus in the receptive field was attended (solid lines) and when the stimulus in the receptive field was unattended (dashed lines). Pairs of cells recorded on the same electrode were excluded. r_sc was calculated in 150 ms sliding time bins. The r_sc value for each bin is plotted at the right-most edge (i.e., the first plot point reflects r_sc, calculated using spike counts in the gray-hatched time window). C and D: attention effect on firing rate (C) and r_sc (D), calculated for each neuron by subtracting the unattended response from the attended response. Particularly toward the end of the trial, firing rates were greater, and r_sc was lesser for attended than unattended stimuli. Effect sizes of attention were greater for fast-spiking than for regular-spiking cells. This pattern of r_sc results was similar when controlling for differences in overall firing rate between cell classes (see Fig. 8). Lines along the bottom of the plots reflect time points with significant nonzero attention effects for fast-spiking (red) and regular-spiking (blue) cells, as well as significant differences between classes (black); P < 0.05, corrected for multiple comparisons.