Biography:

In the past John A. Groeger has collaborated on articles with Antoine U. Viola and Ronan Doorley. One of their most recent publications is ReportPER3 Polymorphism Predicts Sleep Structure and Waking Performance. Which was published in journal Current Biology.

More information about John A. Groeger research including statistics on their citations can be found on their Copernicus Academic profile page.

John A. Groeger's Articles: (4)

ReportPER3 Polymorphism Predicts Sleep Structure and Waking Performance

SummaryCircadian rhythmicity and sleep homeostasis interact to regulate sleep-wake cycles 1, 2, 3, 4, but the genetic basis of individual differences in sleep-wake regulation remains largely unknown [5]. PERIOD genes are thought to contribute to individual differences in sleep timing by affecting circadian rhythmicity [6], but not sleep homeostasis 7, 8. We quantified the contribution of a variable-number tandem-repeat polymorphism in the coding region of the circadian clock gene PERIOD3 (PER3) 9, 10 to sleep-wake regulation in a prospective study, in which 24 healthy participants were selected only on the basis of their PER3 genotype. Homozygosity for the longer allele (PER35/5) had a considerable effect on sleep structure, including several markers of sleep homeostasis: slow-wave sleep (SWS) and electroencephalogram (EEG) slow-wave activity in non-rapid eye movement (non-REM) sleep and theta and alpha activity during wakefulness and REM sleep were all increased in PER35/5 compared to PER34/4 individuals. In addition, the decrement of cognitive performance in response to sleep loss was significantly greater in the PER35/5 individuals. By contrast, the circadian rhythms of melatonin, cortisol, and peripheral PER3 mRNA expression were not affected. The data show that this polymorphism in PER3 predicts individual differences in the sleep-loss-induced decrement in performance and that this differential susceptibility may be mediated by its effects on sleep homeostasis.

Trafficking in cognition: applying cognitive psychology to driving

AbstractThis paper summarises a Presidential Address to the Division of Traffic and Transportation Psychology at the 2002 International Congress of Applied Psychology. It considers whether traffic psychology is a distinct area of psychology, and concludes that the range of psychological approaches that understanding drivers and traffic requires is too pervasive for it to be so. The difficulties and shortcomings of various attempts to apply cognitive psychology to driving and traffic are explored, with respect to perceptual, motor and skilled aspects of the driving task. Examples are given of how ‘understanding driving’ poses theoretical challenges to mainstream cognitive psychology that have yet to be satisfactorily resolved.

Analysis of heart rate variability amongst cyclists under perceived variations of risk exposure

Highlights•Physiological responses of cyclists related to psychological responses.•Perceived risk ratings linked with heart rates of cyclists.•Ambiguity of heart rate values as an indicator of activity intensity of cyclists.

Review ArticleSelf-reported sleep duration and cognitive performance in older adults: a systematic review and meta-analysis

Highlights•Meta-analyses of studies relating sleep duration and cognition in older adults.•Self-reported short and long sleep were associated with poorer cognition.•This was shown in both cross-sectional and prospective studies.•Associations of short and long sleep were found across multiple cognitive domains.•Potential contributors to how sleep duration affects cognitive aging are discussed.

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