(A) Power changes from baseline from ECoG recordings in human V1/V2,
plotted as a function of time and frequency. Grating stimuli elicit large,
sustained gamma oscillations around 50 Hz. In higher frequencies (above 80Hz), a
transient response is present. Noise stimuli elicit a different pattern of
responses. Narrowband gamma oscillations from 30–80 Hz are not evident.
In higher frequencies (above 80Hz), both a large transient and a smaller
sustained response are present. Adapted from Figure 1 of [3].
(B) Plots of spectral power change from baseline for several
stimuli. The Brunet et al. article [5] argues that the power changes from
baseline show a convincing spectral peak around 130Hz for noise patterns. This
area is highlighted in yellow. Adapted from Figure 2 of [3].