Abstract
It has been shown before that unconditioned footshocks can augment the acoustic startle response in rats. In the present study, male mice of two strains, C57Bl/6N and BALB/c, were compared with regard to footshock-induced sensitization of the acoustic startle response. Presentation of footshocks did not affect the acoustic startle response in C57Bl/6N mice, while in contrast, footshock-induced sensitization was apparent in the BALB/c strain. Shocked C57Bl/6N mice, but not BALB/c mice, displayed robust conditioning to the startle context when re-tested the next day. These findings indicate that mice may exhibit footshock-induced sensitization of the acoustic startle response, but that the effects of footshocks on the acoustic startle are strain- and time-dependent.
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