After-stimulus histograms of the A1 receptor response to paired stimuli of different amplitude (Amphipyra perflua F.):
a - Th + 2; b - Th + 6; c - Th + 14 dB  (Th=61 dB SPL). White columns indicate after-stimulus histograms for a single click stimulus. (control). Horizontal axis shows the time period from the moment of occurence of the first click in paired stimulus; vertical axis shows the number of spikes in a single detection channel (spikes/bin); inclined axis shows the interval between the first and the second click in paired stimulus (Int), in msec. Time resolution step is 0.2 msec/bin.