Figure 2. Executive function task performance after five nights of partial sleep deprivation for the PER3 groups.

Mean (±SD) (A) Hayling scaled scores, (B) Brixton scaled scores and (C) Controlled Oral Word Association Test (COWAT) word production per letter at SR5 for PER3^4/4 (A: n = 47; B: n = 48; C: n = 46), PER3^4/5 (A: n = 50; B: n = 52; C: n = 47) and PER3^5/5 (n = 11) subjects. Higher scores indicate better performance on all tasks. None of these executive function tests showed significant differences across the PER3 genotypes (ps >0.05).