Overview of the types of auditory evoked responses.

<p><b>A</b>: The time-frequency map of inter-trial coherence in the responses to the 34-ms no-gap stimulus shows three main effects: the low frequency response below 20 Hz, the transient gamma band response at 40 Hz, and high-gamma responses at 80 Hz and above. <b>B</b>: The time series of activity in the high-gamma band shows two bursts of oscillations, which are expressed in two peaks in the time series of the signal power (upper trace). <b>C</b>: The transient 40-Hz response is likely equivalent to the middle-latency response. <b>D</b>: The low frequency response (black) shows predominantly a positive peak resembling a P1m response. The N1_m -P2_m response is strongly reduced because of fast stimulus repetition. For comparison the response to same stimuli at longer SOA (1500ms) is shown as gray line.