GR blockade prior to six-tone re-exposure has no effect on subsequent fear expression.

<p>A) Behavioral procedure for the experiment. B) Freezing behavior in vehicle treated mice decreased both on day 3 and one month later when compared to the first tone exposure on day 2. RU486 treated mice displayed reduced freezing one month later. No difference in freezing behavior was found between vehicle and RU486 treated animals. <b>^#</b>and<b>^##</b> reflect P<0.05 and P<0.01 respectively when compared to day 2 (n = 6 mice per group).