Attention increases gamma power.

<p>(A) Average firing rates of 96 neurons when a preferred and null stimulus was presented at 100% contrast inside the receptive field, while the monkeys attended to a stimulus outside the receptive field moving at an intermediate direction (P₁₀₀N₁₀₀), the null stimulus inside the receptive field (P₁₀₀N₁₀₀^Att), or the preferred stimulus (P₁₀₀^AttN₁₀₀) inside the receptive field. (B) Time-frequency power difference spectra for the three conditions described in (A). (C) Percent change in firing rates (Firing), gamma power (γ), and high-gamma power (Hi-γ) relative to the P₁₀₀N₀ condition, for the three attentional conditions described in (A). (D) LFP power as a function of frequency (left column) and gamma power as a function of time (right column). The top plot shows the raw power for different attention conditions described in (A). The middle plot shows the comparison between P₁₀₀N₁₀₀^Att versus P₁₀₀N₁₀₀, while the bottom plot shows the comparison between P₁₀₀^AttN₁₀₀ versus P₁₀₀N₁₀₀. Stimuli for these plots are identical, so the difference is purely due to attention. Same convention as in <a href="http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.1001477#pbio-1001477-g004" target="_blank">Figure 4B and 4D</a>.