Power spectral density (PSD) slope analysis. (A) Mean PSD across electrodes (denoted
by N in the legend) during the baseline period (500 ms to 0 ms interval before
stimulus onset) for the two monkeys. Power at frequencies around the monitor refresh
rate (100 Hz) and noise harmonics (120, 240, and 360 Hz) has been masked for visual
clarity. (B) Mean PSD slope as a function of frequency, computed between 20 and 400 Hz
in steps of 10 Hz. The shaded region denotes the SEM of the slope. Black markings on
the frequency axis denote frequencies at which the difference in the slopes was
statistically significant (ANOVA, with
Bonferroni correction).
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