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Twenty years of load theory—Where are we now, and where should we go next? (2016)
Journal Article
Murphy, G., Groeger, J. A., & Greene, C. M. (2016). Twenty years of load theory—Where are we now, and where should we go next?. Psychonomic bulletin & review, 23(5), 1316-1340. https://doi.org/10.3758/s13423-015-0982-5

Selective attention allows us to ignore what is task-irrelevant and focus on what is task-relevant. The cognitive and neural mechanisms that underlie this process are key topics of investigation in cognitive psychology. One of the more prominent theo... Read More

Self-reported sleep duration and cognitive performance in older adults: A systematic review and meta-analysis (2016)
Journal Article
Lo, J. C., Groeger, J. A., Cheng, G. H., Dijk, D., & Chee, M. W. L. (2016). Self-reported sleep duration and cognitive performance in older adults: A systematic review and meta-analysis. Sleep medicine, 17, 87-98. doi:10.1016/j.sleep.2015.08.021

Sleep is important for optimal cognitive functioning across the lifespan. Among older adults (≥ 55 years), self-reported short and long sleep durations have been repeatedly, albeit inconsistently, reported to elevate the risk for poor cognitive funct... Read More

Identifying psychological and socio-economic factors affecting motorcycle helmet use (2015)
Journal Article
Haqverdi, M. Q., Seyedabrishami, S., & Groeger, J. A. (2015). Identifying psychological and socio-economic factors affecting motorcycle helmet use. Accident analysis and prevention, 85, 102-110. https://doi.org/10.1016/j.aap.2015.09.007

Sixty percent of motorcyclist fatalities in traffic accidents of Iran are due to head injuries, but helmet use is low, despite it being a legal requirement. This study used face-to-face interviews to investigate the factors associated with helmet use... Read More

Analysis of heart rate variability amongst cyclists under perceived variations of risk exposure (2014)
Journal Article
Doorley, R., Pakrashi, V., Byrne, E., Comerford, S., Ghosh, B., & Groeger, J. A. (2015). Analysis of heart rate variability amongst cyclists under perceived variations of risk exposure. Transportation research. Part F, Traffic psychology and behaviour, 28, 40-54. https://doi.org/10.1016/j.trf.2014.11.004

Cycling as a mode of travel provides an opportunity for many people to increase their levels of regular physical activity and contribute to their mental and physical health. Heart rate is often used as a means of measuring the intensity and energy ex... Read More

Comparing the effects of nocturnal sleep and daytime napping on declarative memory consolidation (2014)
Journal Article
Lo, J. C., Dijk, D. J., & Groeger, J. A. (2014). Comparing the effects of nocturnal sleep and daytime napping on declarative memory consolidation. PloS one, 9(9), doi:10.1371/journal.pone.0108100

Nocturnal sleep and daytime napping facilitate memory consolidation for semantically related and unrelated word pairs. We contrasted forgetting of both kinds of materials across a 12-hour interval involving either nocturnal sleep or daytime wakefulne... Read More

Cognitive performance in irritable bowel syndrome: Evidence of a stress-related impairment in visuospatial memory (2013)
Journal Article
Kennedy, P. J., Clarke, G., O'Neill, A., Groeger, J. A., Quigley, E. M. . M., Shanahan, F., …Dinan, T. G. (2014). Cognitive performance in irritable bowel syndrome: Evidence of a stress-related impairment in visuospatial memory. Psychological Medicine, 44(7), 1553-1566. https://doi.org/10.1017/S0033291713002171

Background Central nervous system (CNS) dysfunction is a prominent feature of the functional gastrointestinal (GI) disorder, irritable bowel syndrome (IBS). However, the neurobiological and cognitive consequences of key pathophysiological features of... Read More

Differential effects of a dual orexin receptor antagonist (SB-649868) and zolpidem on sleep initiation and consolidation, SWS, REM sleep and EEG power spectra in a model of situational insomnia (2012)
Journal Article
Bettica, P., Squassante, L., Groeger, J. A., Gennery, B., Winsky-Sommerer, R., & Dijk, D. (2012). Differential effects of a dual orexin receptor antagonist (SB-649868) and zolpidem on sleep initiation and consolidation, SWS, REM sleep and EEG power spectra in a model of situational insomnia. Neuropsychopharmacology, 37(5), 1224-1233. doi:10.1038/npp.2011.310

Orexins have a role in sleep regulation, and orexin receptor antagonists are under development for the treatment of insomnia. We conducted a randomised, double-blind, placebo-controlled, four-period crossover study to investigate the effect of single... Read More

Gut memories : towards a cognitive neurobiology of irritable bowel syndrome (2011)
Journal Article
Kennedy, P. J., Clarke, G., Quigley, E. M. M., Groeger, J. A., Dinan, T. G., & Cryan, J. F. (2012). Gut memories : towards a cognitive neurobiology of irritable bowel syndrome. Neuroscience and Biobehavioral Reviews, 36(1), 310-340. doi:10.1016/j.neubiorev.2011.07.001

The brain and the gut are engaged in continual crosstalk along a number of pathways collectively termed the ‘brain–gut axis’. Over recent years it has become increasingly clear that dysregulation of the axis at a number of levels can result in disord... Read More

Age-related reduction in daytime sleep propensity and nocturnal slow wave sleep (2010)
Journal Article
Dijk, D., Groeger, J. A., Stanley, N., & Deacon, S. (2010). Age-related reduction in daytime sleep propensity and nocturnal slow wave sleep. SLEEP, 33(2), 211-223

Objective:To investigate whether age-related and experimental reductions in SWS and sleep continuity are associated with increased daytime sleep propensity.Methods:Assessment of daytime sleep propensity under baseline conditions and following experim... Read More

Early morning executive functioning during sleep deprivation is compromised by a PERIOD3 polymorphism (2008)
Journal Article
Groeger, J. A., Viola, A. U., Lo, J. C., von Schantz, M., Archer, S. N., & Dijk, D. (2008). Early morning executive functioning during sleep deprivation is compromised by a PERIOD3 polymorphism. SLEEP, 31(8), 1159-1167. doi:10.5665/sleep/31.8.1159

Study Objectives: To contrast the effects of total sleep deprivation (TSD) on executive and non-executive function in volunteers homozygous for either the short or long variant of a variable number tandem repeat polymorphism in PERIOD3 , which is a... Read More