FIG. 6.

The effect of repetitive mild TBI (rmTBI) on anxiety and associative learning in post-natal day 18 rats that underwent either sham insult or mTBI on three consecutive occasions 24 h apart. Elevated plus maze and fear conditioning tests were performed at 90 and 92 days, respectively, after the last sham insult or mTBI. There was no difference between groups in the amount of time spent on the open arms of the maze (A) and the percentage of open arm entries (B). Rats exposed to rmTBI froze less than the rats exposed to repeated sham insults during both contextual fear conditioning (C) and cued fear conditioning (D) (n = 9–12/group, mean ± standard error of the mean, *p < 0.05).