Research
Research
Embedded Files
Fatigue & Sleep Deprivation
Fatigue & Sleep Deprivation
Fatigue and sleep deprivation have profound effects on performance and brain function. Yet, we find ourselves faced with these conditions on a regular basis. My work focusses on how cognitive functions such as attention and decision making are altered when we get tired from prolonged work or lack of sleep. I use behavioral experiments, neuroimaging and computational modeling techniques.
click to view publications
Selected Publications
Massar, S. A. A., Lim, J., & Huettel, S. A. (2019). Sleep deprivation, effort allocation and performance. In Progress in brain research (Vol. 246, pp. 1-26). [PDF]
Massar, S. A. A., Lim, J., Sasmita, K., & Chee, M. W. (2019). Sleep deprivation increases the costs of attentional effort: Performance, preference and pupil size. Neuropsychologia, 123, 169-177. [HTML] [Supplement]
Massar, S. A. A., Csathó, Á., & Van der Linden, D. (2018). Quantifying the motivational effects of cognitive fatigue through effort-based decision making. Frontiers in psychology, 9, 843. [Link]
Massar, S. A. A., Wester, A. E., Volkerts, E. R., & Kenemans, J. L. (2010). Manipulation specific effects of mental fatigue: evidence from novelty processing and simulated driving. Psychophysiology, 47(6), 1119-1126. [Link]
Motivation, Effort & Reward
Motivation, Effort & Reward
A topic special interest is how our brain motivates us to perform well and invest effort towards attaining our goals. I'm particularly interested in the areas of effort-based decision making and reward motivation. I study these phenomena in well-rested states as well as in sleep deprivation and fatigue.
click to view publications
Selected Publications
Massar, S. A. A., Pu, Z., Chen, C., & Chee, M. W. (2020). Losses Motivate Cognitive Effort More Than Gains in Effort-Based Decision Making and Performance. Frontiers in Human Neuroscience, 14, 287. [Link] [Supplement] [Data/Code]
Massar, S. A. A., Lim, J., Sasmita, K., & Chee, M. W. (2016). Rewards boost sustained attention through higher effort: A value-based decision making approach. Biological Psychology, 120, 21-27. [Link]
Massar, S. A. A., Libedinsky, C., Weiyan, C., Huettel, S. A., & Chee, M. W. (2015). Separate and overlapping brain areas encode subjective value during delay and effort discounting. Neuroimage, 120, 104-113. [Link]
Libedinsky, C., Massar, S. A. A., Ling, A., Chee, W., Huettel, S. A., & Chee, M. W. (2013). Sleep deprivation alters effort discounting but not delay discounting of monetary rewards. Sleep, 36(6), 899-904. [Link]
Stress & Emotion
Stress & Emotion
Affective states can influence how we perceive the world, wat information we attend to, and how we act. At the same time, how we emotionally respond to stressful situations can be influenced by our current state of mind (e.g. sleep deprivation, anxiety) or by stable differences between individuals. I study how these factors interact.
click to view publications
Selected Publications
Teng, J., Massar, S. A. A., & Lim, J. (2022). Inter-relationships between changes in stress, mindfulness, and dynamic functional connectivity. Scientific reports. [Link]
Lin, J., Massar, S. A. A., & Lim, J. (2020). Trait mindfulness moderates reactivity to social stress in an all-male sample. Mindfulness, 11, 2140–2149. [PDF] [Data]
Massar, S. A. A., Liu, J. C., Mohammad, N. B., & Chee, M. W. (2017). Poor habitual sleep efficiency is associated with increased cardiovascular and cortisol stress reactivity in men. Psychoneuroendocrinology, 81, 151-156. [PDF]
Liu, J. C., Verhulst, S., Massar, S. A. A., & Chee, M. W. (2015). Sleep deprived and sweating it out: the effects of total sleep deprivation on skin conductance reactivity to psychosocial stress. Sleep, 38(1), 155-159. [Link]
Massar, S. A. A., Mol, N. M., Kenemans, J. L., & Baas, J. M. (2011). Attentional bias in high-and low-anxious individuals: evidence for threat-induced effects on engagement and disengagement. Cognition & emotion, 25(5), 805-817. [Link]
Remote Sleep Tracking
Remote Sleep Tracking
The latest endeavor of our lab is to study sleep in the general community through mobile and wearable tracking technology. These technologies allow for large-scale long-term tracking of sleep in the natural environment. An important challenge is to calibrate and validate the data derived from these technologies. We recently published a paper in collaboration with the Singapore Health Promotion Board, on the changes in sleep and physical activity during the COVID-19 lockdown in >1000 individuals.
Ong, J. L., Lau, T. Y., Massar, S. A. A., Chong, Z. T., Ng, B. K. L., Koek, D., ... & Chee, M. W. L. (In Press). COVID-19 Related Mobility Reduction: Heterogenous Effects on Sleep and Physical Activity Rhythms. SLEEP. [Link] [Supplement]
Massar, S. A. A., Ng, A. S. C., Soon, C. S., Ong, J. L., Chua, X. Y., Chee, N. I. Y. N. , Lee, T. S., & Chee, M. W. L. (2022). Reopening after lockdown: the influence of working-from-home and digital device use on sleep, physical activity, and wellbeing following COVID-19 lockdown and reopening. SLEEP. [Link]
Massar, S. A. A., Chua, X. Y., Soon, C. S., Ng, A. S. C., Ong, J. L., Chee, N. I. Y. N. , Lee, T. S., Ghosh, A. & Chee, M. W. L. (2021). Trait-like nocturnal sleep behavior identified by combining wearable, phone-use, and self-report data. NPJ Digital Medicine, 4, 90. [Link]
Page updated
Google Sites
Report abuse