Time courses of activity in the higher gamma band (72–98 Hz) in the right auditory cortex.

<p><b>A</b>: The responses to the no-gap stimuli exhibit two peaks, the first 15 ms after stimulus onset, the second 28 ms after stimulus offset. The response amplitudes decline with increasing age. <b>B</b>: Time courses of high-gamma responses to gap stimuli are shown in different color for the age groups in comparison to responses to the no-gap stimuli shown as black lines. The main peak in the responses to gap stimuli appears at latency between those of the onset and offset response in the corresponding no-gap stimuli. Responses to gap-stimuli were in general larger than responses to no-gap stimuli (note the different scales on the y-axes). <b>C</b>: Bar graphs representing the peak amplitude of the offset response to no-gap stimuli for the three age groups. The error bars denote the upper 95% confidence limits for the group mean. Results of the analysis of phase coherence across each group are indicated at the base of each bar (*: .05≤p<0.01, **: p≤0.01, ns: not significant). <b>D</b>: Bar graphs of the amplitudes of high-gamma responses to gap stimuli.