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. Author manuscript; available in PMC: 2015 Apr 13.
Published in final edited form as: Trends Cogn Sci. 2015 Jan 6;19(2):57–58. doi: 10.1016/j.tics.2014.12.009

Figure 1. Stimulus effects on Gamma oscillations.

Figure 1

(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].