Enhancement of acoustic prepulse inhibition by contextual fear conditioning in mice is maintained even after contextual fear extinction

Progress in Neuro-psychopharmacology & Biological Psychiatry
Daisuke IshiiEiji Shimizu

Abstract

Prepulse inhibition (PPI) of the acoustic startle response is one of the few and major paradigms for investigating sensorimotor gating systems in humans and rodents in a similar fashion. PPI deficits are observed not only in patients with schizophrenia, but also in patients with anxiety disorders. Previous studies have shown that PPI in rats can be enhanced by auditory fear conditioning. In this study, we evaluated the effects of contextual fear conditioning (FC) for six times a day and fear extinction (FE) for seven days on PPI in mice. C57BL/6J mice (male, 8-12 weeks) were divided into three groups; no-FC (control), FC and FC + FE. We measured PPI at the following three time points, (1) baseline before FC, (2) after FC, and (3) after FE. The results showed that PPI was increased after FC. Moreover, the enhanced PPI following FC was observed even after FE with decreased freezing behaviors. These results suggested contextual fear conditioning could enhance acoustic PPI, and that contextual fear extinction could decrease freezing behaviors, but not acoustic PPI.

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Citations

Apr 25, 2012·Biological cybernetics·David Fernando Ramirez-Moreno, Terrence Joseph Sejnowski
Oct 18, 2015·Behavioural Brain Research·Yoshikazu NikaidoShinya Ueno
Jan 31, 2019·Frontiers in Behavioral Neuroscience·Daisuke IshiiYutaka Kohno
Jun 15, 2017·Frontiers in Behavioral Neuroscience·Inês Pereira-FigueiredoConsuelo Sancho

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