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Examples of “OR”-like and “AND”-like responses in individual auditory neurons. Spike raster plots, peristimulus histograms, and spectrograms for 2 stimuli (“A” and “B”) presented sequentially (top) and together (bottom) illustrating an AND-like response [summation index (SmI) = ∞; A] and an OR-like response (SmI = −0.05) in a different neuron (B). The ordinate in the histograms indicates the average number of spikes per repetition assorted in 20-ms bins.
