Figure 6. SSA but no novelty correlate in auditory cortex local field potential (LFP) responses. A, Population evoked LFP response in the frequency oddball paradigm averaged over all recording sites. The responses were normalized to the amplitude of the N20 response to the standard for the respective electrode and stimulus (f1 or f2) before averaging. Shown is the evoked response to the standard (blue), deviant (red), or their difference (gray). B, Population evoked LFP response to the deviant (red, same as in A), control (black), or their difference (gray). C, E, Histograms represent the stimulus-specific adaptation index, averaged over the f1 and f2 stimuli, for the N20 (C) or P110 (E) component of the LFP, binned for all sites. Bar plot indicates the median normalized response amplitude to the standard (“s”) and deviant (“d”) stimuli. D, F, Histograms are the counterparts to (C, E) constructed for the novelty index. G, Median change, over the population, in the LFP N20 response to the standard following the treatment indicated. H, Median change, over the population, in the LFP N20 response to the deviant following the treatment indicated. I, Median change, over the population, in the LFP N20 stimulus-specific adaptation index, caused by the treatment indicated. All error bars represent the upper and lower quartile values.