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Decreased acoustic startle response and altered prepulse inhibition in middle‐aged and old‐aged C57BL/6J mice. (A) Acoustic startle response to sound stimuli (110 and 120 dB white noise) and (B) prepulse inhibition (%) of the startle response with 74 and 78 dB prepulse stimuli. Values are means ± SEM. Asterisks indicate significant differences between groups after Bonferroni correction for multiple comparisons (P < 0.0083)
