Steady state evoked potential (SSEP) responses in the primary and secondary somatosensory cortices of anesthetized cats: Nonlinearity characterized by harmonic and intermodulation frequencies
Fig 8
Time course of the mean nontagged HGP and the frequencies of interest in S2.
(A) Evoked bandlimited power (half band width = 2Hz) around the stimulus onset. Mean log power is first averaged within the frequencies of interest for HGP (thick black), f1 harmonic (red), and intermodulation (blue) frequencies around HGB for each trial. Different line types for different frequencies (see the legend). Mean across trials per channel is further averaged across channels. The mean power during -0.5 to -0.25s for each frequency per trial is subtracted. (B) Summary of HGP, harmonic and intermodulation frequencies. Time courses for the harmonic (red) intermodulation (blue) in (A) are averaged for each category within each channel. Shading represents standard error of the mean across the top 10% channels selected as in Fig 6.