Figure 1.
Time–frequency plots displaying age-related changes in evoked amplitude (A) and phase-locking factor (B) in response to 40-Hz click trains. Stimulus onset is at 0 ms (green dashed line) and offset is at 500 ms (red dashed line). A marked increase in evoked amplitude and phase-locking centered around 40 Hz is apparent during stimulus presentation for all age bins with the largest response for both measures observed at 14–16 years. Insets above each time–frequency plot in (A) show the scalp topography of gamma amplitude (anterior electrodes in downward direction), demonstrating consistent distributions across the age bins, centered on electrode FCz (outlined by black circle).