Behavioral performance. Overall, mTBI rats assigned to control housing showed longer mean swim latency (A) and made more errors (B) in the non-matching-to-sample. Increasing time delay between the sample and test trials also resulted in more errors made (C). Remarkably, providing enrichment after injury enhanced functional recovery as seen in the similar performance of the mTBI rats housed in EE and the sham control animals. EE housing in sham animals also led in enhanced behavioral performance. *p < 0.05, **p < 0.01.