LFP power as a function of frequency band and depth during the preparatory period in areas 8Ad and LIP. A, Preparatory period. Marmosets were maintaining fixation on central instruction cue. Analysis epoch was 500 ms before peripheral stimulus onset. B, LFP power spectrum on prosaccade (blue lines) and antisaccade (red lines) trials for electrode locations 150 (dashed lines) and 1200 μm (sold lines) below the cortical surface. Main depicts LFP power as a function of task and depth in the alpha band (inset) rescaled to highlight differences in the gamma band. C, LFP power in alpha (left), and gamma (right) bands as a function of depth for area 8Ad. Top, Alpha and gamma power as a function of depth on prosaccade (blue lines) and antisaccade (red lines) trials. Bottom, Same as top, but for correct (red lines) and erroneous (blue lines) antisaccade trials. Dashed lines represent SEs. D, same as C but for area LIP.