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Acoustic startle responses are reduced in aged mice. A, The movement intensity (artificial units) in response to 40 ms pulses of white noise (0–55 dB above background) is shown. B, The slope of the movement intensity over the stimulus intensity (in decibels above background) is shown. Values are expressed as the mean ± SEM (A) or box plots, as defined in the Data analysis section in Materials and Methods (B). ***p < 0.0001.
