Fig. 1

Mean auditory steady-state responses (ASSRs) in event-related spectral perturbations (ERSPs), inter-trial coherence (ITCs), and ERPs recorded from five subjects. Aa Placement of EEG electrodes. G, ground electrode. Ab Schematic diagram of 40-Hz click train. B Grand-averaged ASSRs at Cz in ERSPs (upper panel), ITCs (middle panel), and mean ERPs (lower panel) for five monkeys in response to click trains at 20, 40, 58.8, and 83.3 Hz. Dotted lines indicate stimulus onset. The y-axes indicate the spectral frequency of ERSPs and ITCs. Color bars indicate the values of ERSP (dB) and ITC (coherence) at each time-frequency point