Fig. 3

Spike-phase coupling (SPC) index at different low-frequency bands for the two attention conditions. The x-axis shows the middle frequency of 4 Hz windows stepped by 1 Hz, and y-axis shows the SPC index corresponding to each frequency band averaged across the population of site pairs across monkeys. The attended condition data are shown using solid lines, and the unattended condition is shown using dashed lines. The number of site pairs is provided on the top of the figure. Error bars are SEM