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Mean (±standard error of the mean) percentage of time spent in the target quadrant (i.e., where the platform was previously located), following a single-probe trial 19 days after TBI or sham injury (*p≤0.003 versus TBI+STD+vehicle, 1.0 mL/kg; **p<0.0001 versus TBI+STD+vehicle, 1.0 mL/kg). No other group comparisons were significant. The dotted line represents performance at the chance level (25%; EE, environmental enrichment; STD, standard environment; TBI, traumatic brain injury).
