Tower of London performance after five nights of partial sleep deprivation for the PER3 genotypes.

Mean (±SD) Tower of London (TOL) performance measures at SR5 for PER3^4/4 (n = 46), PER3^4/5 (n = 53) and PER3^5/5 (n = 11) subjects. (A) total correct; (B) total moves; (C) initiation time (secs); (D) execution time (secs); (E) total time (secs); (F) total time violations; (G) total rule violations. In all panels except (A), lower values indicate better performance; thus, the top of the ordinate represents better performance. None of the TOL performance measures showed significant differences across the PER3 genotypes (ps >0.05).