Figure 2.
Gamma-Band power spectrum from 90 experiments A, The time course of a 4 s LFP during visual stimulation by a drifting grating. B, Power spectra of the LFP: spontaneous LFP spectrum (black); LFP spectrum of the response to a drifting grating stimulus (magenta) from A. C, R-spectrum of the data from 10 to 100 Hz averaged over all 90 experiments. D, Peak value of the R-spectrum in the gamma-band for each experiment. E, Spectral shape index (SSI) for each experiment. The slow trend upwards in D and E are not meaningful and probably reflect increasing skill of the experimenters.