Time-of-day effects on cognition in preadolescents: a trails study.
Cognitive performance fluctuates during the day due to diurnal variations in alertness level. This study examined: (1) whether cognitive performance in school-aged children is affected by time-of-day; (2) which functional domains are particularly vulnerable to time-of-day effects; and (3) whether the effects are more pronounced for cognitively more demanding tasks or task conditions. Children, aged 10-12 yrs, were randomly assigned to a test session starting either at 08:30 (n = 802), 10:00 (n = 713), or 13:00 h (n = 652). Speed and accuracy of information processing were evaluated by tasks that assess input-related cognitive processes (e.g., stimulus encoding), central cognitive processes (e.g., working memory, sustained attention), and output-related processes (e.g., response organization) using the Amsterdam Neuropsychological Tasks program. Time-of-day effects in children were identified in specific neurocognitive domains, such as visuospatial processing and working memory, but only under cognitively more demanding task conditions. Sustained attention showed a speed-accuracy tradeoff with increased slowness and lapses in the early morning, but with better feedback responsiveness and perceptual sensitivity than in the early afternoon. Furthermore, there was a significant interaction of time-on-task with time-of-day for tempo, with the afternoon group increasing in tempo with time-on-task, and the early-morning group first showing a slowing of tempo with time-on-task, followed at the end of the task by a speed increase towards the initial levels. To conclude, the authors found time-of-day effects in preadolescents, which were confined to cognitively more demanding tasks tapping input-related and central cognitive processes.
Department of Clinical Child and Adolescent Studies, Leiden Institute for Brain and Cognition, Leiden University, Wassenaarseweg 52, Leiden, The Netherlands. kbheijden@fsw.leidenuniv.nl
Kristiaan B
KB
van der Heijden
Leo M J
LM
de Sonneville
Monika
M
Althaus
D001288:Attention / Q000502:physiology; D002648:Child; D002940:Circadian Rhythm / Q000502:physiology*; D003071:Cognition / Q000502:physiology*; D003710:Demography; D004522:Educational Status; D005220:Fathers; D005260:Female; D006801:Humans; D008297:Male; D008568:Memory / Q000502:physiology; D009035:Mothers; D009426:Netherlands; D009483:Neuropsychological Tests; D009790:Occupations; D011627:Puberty / Q000502:physiology / Q000523:psychology; D012424:Rural Population; D013647:Task Performance and Analysis; D014505:Urban Population