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Fluctuations of gap-induced suppression of the acoustic startle response over a 360 day period in a control mouse. Open bars represent control means ± SD of (G + S)/S ratios measured at 6 different background frequencies (10, 12.5, 16, 20, 25, and 31.5 kHz). The grey bars represent ratios measured at the same frequencies but at different time points after pre-exposure measurements.
