Swim speed (s) of sham- and TBI-rats with various survivals in daily Morris water maze (MWM) test. The animal swim-speed did not significantly differ between sham and TBI subgroups in daily MWM test (p > 0.05). Day1: The swim speed was 41.87 ± 2.49, 42.45 ± 3.87, 40.63 ± 4.11, and 41.31 ± 3.93 respectively for the group of sham, 6, 24, and 72 h. Day2: The speed was 34.81 ± 2.33, 35.10 ± 1.80, 35.78 ± 3.72, and 37.00 ± 2.63, respectively, for these above groups. Day3: The speed was 36.26 ± 3.31, 37.28 ± 3.12, 34.73 ± 3.61, and 37.37 ± 2.75, respectively, for these groups. Day4: The speed was 34.15 ± 1.82, 34.29 ± 3.00, 33.82 ± 2.63, and 35.25 ± 2.31, respectively, for these groups. Although nearly all subgroups of sham- and TBI-rats showed slightly faster speeds across the 4-day swimming trial, the speed differences were not statistically significant (p > 0.05). Data are presented as mean ± SEM, n = 8.