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To compare before- and after-school neurocognitive performance and total symptoms in a sample of nonconcussed high school athletes. Repeated-measures, counterbalanced design. Midwest high schools. Thirty-nine nonconcussed high school athletes. The Immediate Post-Concussion Assessment and Cognitive Testing battery was administered before and after school in a counterbalanced testing order. Neurocognitive and total symptom scores. Paired-sample t tests revealed no significant differences in verbal memory (P = 0.43), visual memory (P = 0.44)