Sleep and Cognition Lab
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The Sleep and Cognition (SaC) Lab is interested in understanding who we are as humans by investigating how we form memories. Memories are at the core of our personal and social histories, our perceptions, and our beliefs. By understanding how memories are formed, processed and retained, we can understand how they can be improved, as well as how memory abilities can falter due to aging or disease. We are specifically interested in translational research questions that lead to improving the lives of people with cognitive impairments. To accomplish this work, we utilize electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) to measure brain activity during sleep and wake. We also use pharmacology and brain stimulation during sleep to improve waking performance. In addition, we use signal processing and computational modeling to reveal patterns in the data not available to the naked eye.
Questions we are exploring include:
Why do some memories tend to become stronger after a period of sleep?
How do brain areas communicate during sleep-dependent memory consolidation?
Do different types of memory (explicit/declarative vs implicit/non-declarative) require different features of sleep for consolidation?
Can we enhance individual sleep features with pharmacology or electrical brain stimulation to enhance memory performance?
Can these interventions be used in populations with memory dysfunction, e.g., elderly, mild cognitive impairment, Alzheimer’s disease, post-traumatic stress disorder, and other mental illnesses?
Sara Mednick, PhD
Dr. Sara Mednick is a Professor in the Department of Cognitive Science at the University of California, Irvine and author of the book, Take a Nap! Change your Life (Workman). In graduate school at Harvard University, she worked with Robert Stickgold and Ken Nakayama studying the role of sleep in perceptual learning. During that time, she pioneered studies using a nap design that provided methodological advancements from nocturnal sleep studies. Nap studies have become to the dominant research method to understand the role of sleep in memory formation. For her post-doc at the Salk Institute and UCSD under Drs Sean Drummond and Geoffrey Boynton, she received an NIH NRSA fellowship to bring the technique of fMRI to bear on examination of the neural mechanisms underlying sleep-dependent consolidation of perceptual learning. In 2011, she took a position as an Assistant Professor position at UCR Psychology Department (2011-2015), tenured to Associate Professor in 2015. On Jan 1, 2018, she began at UC Irvine Department of Cognitive Sciences. Dr. Mednick has conducted studies in conjunction with numerous academic institutions, the U.S. Navy, V.A. Medical Center and private businesses. Her articles have been published in such leading scientific journals as Nature Neuroscience and The Proceedings from the National Academy of Science. Her napping research has been covered by CNN, Reuters TV, NPR, The Economist, The Wall Street Journal, Consumer Reports Health Journal, Reader’s Digest, The New York Times and many other major media outlets. Dr. Mednick resides in San Diego, CA. A list of her peer-reviewed manuscripts and abstracts can be found here. If you would like more information about Dr. Mednick’s research, please visit her website. Her CV can be found here.
Sara Mednick, PhD
Dr. Sara Mednick is Associate Professor in the Department of Psychology at the University of California, Riverside and author of the book, Take a Nap! Change your Life. In 2003, she received her PhD in psychology from Harvard University working with Ken Nakayama and Robert Stickgold. She moved to the Salk Institute for Biological Studies in La Jolla, CA with a three-year, National Institute of Health funded, National Research Service Award fellowship, where she trained with Geoffrey Boynton and Sean Drummond. In fall 2007, she became faculty at University of California, San Diego and was awarded a five-year, National Institute of Mental Health funded, K01 Mentored Research Scientist Award. In 2011, Dr. Mednick moved her lab to UC Riverside. Dr. Mednick has conducted studies in conjunction with numerous academic institutions, the U.S. Navy, V.A. Medical Center and private businesses. Her articles have been published in such leading scientific journals as Nature Neuroscience and The Proceedings from the National Academy of Science. Her napping research has been covered by CNN, Reuters TV, NPR, The Economist, The Wall Street Journal, Consumer Reports Health Journal, Reader’s Digest, The New York Times and many other major media outlets. Dr. Mednick resides in San Diego, CA.
Negin is a doctoral student in the Cognitive Sciences department at UC Irvine. She received her B.S. in Computer Science from Sadjad University of Higher Education in Mashhad, Iran and her M.A. in Psychology from University of California, Riverside. Negin’s research interests entail the effect of sex hormones on sleep-related memory consolidation and learning. Negin has also investigated the effect of napping on memory formation in older adults. A list of Negin’s peer-reviewed manuscripts and abstracts can be found here (Google Scholar and ORC-ID).
Tenzin Tselha is a doctoral student in the Cognitive Sciences department at UC Irvine. Tenzin is Tibetan and grew up in Chauntra(H.P.), India. He completed his M.S. in Neuroscience from Stony Brook University, New Yorkce.. His primary research interests are in the field of learning and memory. Since joining the lab he has been working on memory reactivation during sleep using functional magnetic resonance imaging (fMRI). He is also interested in studying the glymphatic system in humans using fMRI (i.e., the brain waste disposal system). In a recent project, he has examined the effects of psychostimulants on working memory and sleep.
Besides research activities, he considers himself an activist for human rights in Tibet, student of Buddhist philosophy of emptiness, and lastly a Barcelona football club fan. A list of Tenzin’s peer-reviewed manuscripts and abstracts can be found here.
PinChun is a doctoral student in Cognitive Neuroscience at UC Irvine. She received her B.S. in Psychology and B.Ed. in Education with 1st Class Honors from National Chengchi University, Taiwan in 2017. PinChun’s research interests include the effect of aging, autonomic activity, and brain stimulation on memory consolidation. A list of PinChun’s peer-reviewed manuscripts and abstracts can be found here (Google Scholar and ORC-ID).
Frida is a doctoral student in the Cognitive Sciences department at UC Irvine. She completed her undergraduate degree at the University of Illinois at Urbana-Champaign, where she worked in a honeybee lab. Afterwards, she spent a year doing an NIH post-bac at Rebecca Spencer’s Sleep and Cognition Lab at the University of Massachusetts, Amherst.
Her primary research interests are the impact of health disparities on sleep, and disrupted circadian rhythms and the use of light to shift circadian rhythms. She is currently working on analyzing sleep and stress information to determine the role of ethnicity and stress on sleep, cognition, and overall health. A list of Frida’s peer-reviewed manuscripts and abstracts can be found here (Google Scholar and ORC-ID)..
Jing is a doctoral student in Cognitive Neuroscience at UC Irvine. She received her B.S. in Psychology with a minor in gender studies at Furman University. After graduation, she spent two years working as a research assistant at Seminowicz Pain Imaging lab at University of Maryland Baltimore (https://www.daslab.org).
Her research interests include the role of autonomic nervous system in sleep and cognitive functioning as well as biomarkers of cognitive processing during sleep. Ultimately, she hopes to gain a deeper understanding in how sleep physiology influence our cognition and ways to enhance it.
Kate Simon, PhD
Kate Simon is a postdoctoral researcher in the Sleep and Cognition Lab at UC Irvine and licensed clinical psychologist. Prior to joining, Kate received her B.A. at UC Berkeley where her interest in the science of sleep and development was sparked while working as a research assistant for Drs. Matt Walker, Allison Harvey, and Joseph Campos. She obtained her clinical psychology doctorate at the University of Arizona under the guidance of Drs. Lynn Nadel, Rebecca Gomez, and Richard Bootzin. Her graduate work focused on sleep and memory in early development, memory reconsolidation, and targeted memory reactivation for forgetting. She then completed her clinical psychology internship and postdoctoral fellowship in Pediatric Consultation-Liaison at the Children’s Hospital of Orange County (CHOC). Kate’s current primary research interests are the mechanisms underlying sleep and memory formation, the effect of sex hormones on long-term memory, developmental sleep, and targeted memory reactivation. For recent research and publications, visit her Google Scholar page.
Hamid Niknazar, PhD
Hamid Niknazar joined the Sleep and Cognition Lab at UC Irvine as a postdoctoral researcher in March 2020. He received his PhD in Biomedical Engineering at the Science and Research Azad University, Iran, in 2018. There, the focus of his research was on developing new methods for nonlinear dynamics quantification and their different applications in EEG signal processing such as epileptic seizure prediction and EEG patterns in sleep. His main research interest includes intersection of computational neuroscience, signal processing, nonlinear dynamics, and machine learning. For recent research and publications, visit his Google Scholar page.
Ben is a doctoral student in the Cognitive Sciences department at UC Irvine. Coming from an engineering background, Ben’s work blends Bayesian modeling and machine learning techniques with memory and sleep data.
His initial foray in the sleep field involved applying machine learning and signal processing techniques on EOG data to detect the presence of Rapid Eye Movements.
More recently, his work on sleep dynamics and big data has quantified the influence of individual differences on the sequence of sleep states. Other projects of note include developing an online sleep data collection tool (www.modasleepscoring.com) and investigating how memories encoded close in time might become integrated, such that layer manipulations of one effect the other.
Current interests include examining trait-level individual differences of sleep electrophysiological markers as predictors of cognitive outcomes. For example, are there sleep features that more stable within an individual than across people, and can they be used to predict workplace performance? A list of Ben’s peer-reviewed manuscripts and abstracts can be found here (Google Scholar, ORC-ID, and OSF).
When not working on analysis code for the sleep and cognition lab, Ben likes to snowboard and cook. He also enjoys traveling, especially back to his home country of New Zealand.
Paola Malerba, PhD
Paola obtained a PhD in Mathematics at Boston University in 2010 and she applies mathematical analysis and modeling to the understanding of brain rhythms. Within SaC Lab, she has studied the spatio-temporal patterns of slow oscillations on the electrode manifold. Using k-clustering and relative detection probability we have found that slow oscillations were clustered in three types: Global, Local or Frontal depending on their footprint on the electrode manifold during a time window. Global slow oscillations showed the strongest relationship with sleep spindles, both in amplitude and probability of detection. This research is laying the foundation for modeling work on the spatio-temporal occurrence of slow oscillations and spindles on the electrode manifold, to study how closed-loop stimulation during sleep changes sleep waves and possibly memory performance. A list of Paola’s peer-reviewed manuscripts and abstracts can be found here (Google Scholar and ORC-ID).
Lauren Whitehurst, PhD
Lauren Whitehurst received her. B.S. in Psychology and M.A. in Experimental Psychology from James Madison University in 2011 and 2013, respectively and her PhD in Psychology from the University of California, Riverside in 2018. She is currently a T32 and Chancellor’s Postdoctoral Fellow at the University of California, San Francisco in the Department of Psychiatry. Lauren’s research interests broadly entail the processes during sleep that are important for health and cognitive function including how external stressors (e.g. exposure to discrimination, illicit drug use) may impact sleep physiology and result in notable health consequences. Additionally, her work investigates how autonomic and central nervous system factors interact to produce regulatory effects on sleep-dependent health and cognitive outcomes. Further, by harnessing physiological biomarkers during sleep, her work aims to develop a greater understanding of both typical functioning and maladaptive health states. For recent research and publications, visit her Google Scholar page.
Mohsen Naji, PhD
Mohsen joined the Sleep and Cognition lab in December 2015. He obtained a PhD in Biomedical Engineering (Bioelectrics) at the Science and Research Azad University, Iran, in 2014 working on designing an emotion recognition system via fusion of heart and brain signals. His work in the Sleep and Cognition lab included study of cardiac-brain interactions during sleep and its role in memory consolidation, as well as developing techniques for investigating neural events during rapid-eye movement (REM) and non-REM sleep. He is currently an Algorithm Scientist with Sotera Wireless, Inc., San Diego. For recent research and publications, visit his Google Scholar page.
Elizabeth McDevitt, PhD
Elizabeth McDevitt (PhD, Cognitive Psychology, UC Riverside, 2017) is currently a Postdoctoral Researcher in the Computational Memory Lab at Princeton Neuroscience Institute. Her graduate work in the SaC Lab focused on understanding mechanisms of memory consolidation during sleep, with an emphasis on the memory function of REM sleep. She also investigated individual differences in napping behavior and how they might impact sleep-dependent memory benefits from napping. Her current research utilizes functional MRI to look at multivariate patterns of brain activity to investigate how sleep might drive changes in memory representations in the brain. For recent research and publications, visit her Google Scholar page.
Katherine Duggan, PhD
Katherine Duggan (PhD, Social/Personality Psychology, UC Riverside, 2016) is currently a Postdoctoral Fellow in the Department of Psychiatry at the University of Pittsburgh. While with the lab, her work focused on developing models linking conscientiousness and neuroticism with healthy self-reported sleep habits. She also adopted statistical methods common in other fields (e.g., personality, aging) to experimental work on sleep and memory consolidation. Her current research is focused on developing prospective, causal models linking conscientiousness with health biomarkers (e.g., metabolic syndrome) and outcomes (e.g., mortality risk) via self-reported and objectively-assessed sleep. For recent research and publications, visit her Google Scholar page.
Mohammad Niknazar, PhD
Mohammad received his B.Sc. degree in electrical-electronic engineering in 2007, and M.Sc. degree in electrical-biomedical engineering in 2010 from Sharif University of Technology. There, the focus of his research was on detection and prediction of epileptic seizures using EEG recordings in rats as well as humans. He received his Ph.D. in signal, image and speech processing and telecommunication from Joseph Fourier University, Grenoble I, France. He worked on separation of fetal and maternal electrocardiogram (ECG) signals.
Mohammad completed his postdoctoral research at the University of California, Riverside from 2014 to 2016 where he focused on the effects of sleep on memory consolidation. Most recently, Mohammad held the title as Data Scientist for Phosphorous, a biotechnology company. For recent research and publications, visit his Google Scholar page.
Jennifer Kanady, PhD
Jennifer Kanady received her Ph.D. in Clinical Science from the University of California, Berkeley in 2016. She completed her psychology internship at the Puget Sound VA Health Care System, Seattle. Before she began her doctoral studies at UC Berkeley, she was a lab coordinator for Dr. Mednick at UC San Diego from 2005 to 2009. She is currently a Research Postdoctoral Fellow as part of the Mental Illness, Education, and Clinical Center (MIRECC) program at the San Francisco VA Health Care System and the University of California, San Francisco. Broadly, her research focuses on examining associations between sleep and circadian disruptions and cognitive and emotional symptoms across mental health conditions and the life span. For recent research and publications, please visit her Google Scholar page.
Denise Cai, PhD
Denise Cai is an Assistant Professor in the Neuroscience Department at the Icahn School of Medicine at Mount Sinai. Her lab investigates the temporal dynamics of how memories are formed, integrated and separated. In addition, her team studies how aging contributes to cognitive decline. During her doctoral studies with Sara Mednick at UCSD, she characterized how REM sleep enhanced creative problem solving by integrating recently learned information with prior experience. As a postdoctoral fellow with Alcino Silva at UCLA, she discovered that memories encoded close in time are linked by sharing an overlapping neural ensemble, such that recalling one memory triggers another temporally-related memory through the overlapping ensemble. She also found there are disruptions in temporally linking memories with aging. She was also a key developer in the Miniscope project, which aims to advance development of imaging tools and techniques via an open-source platform and open-sharing of all developments through an online Wiki resource as well as hands-on workshops. For recent research and publications, please visit her Google Scholar page.
- Chen P, Sattari N, Whitehurst LN, Mednick SC, Age‐related losses in cardiac autonomic activity during a daytime nap. Psychophysiology, 13 October 2020 https://doi.org/10.1111/psyp.13701
- Whitehurst LN, Chen P, Naji M, & Mednick SC, New direction in sleep and memory research: the role of autonomic activity. Curr Opinion in Behavioral Sciences 2020, 33:17-24, doi.org/10.1016/j.cobeha.2019.11.001
- Chen P, Whitehurst, LN, Naji M, & Mednick SC, Autonomic Activity during a Daytime Nap Facilitates Working Memory Improvement. Journal of Cognitive Neuroscience 2020, doi.org/10.1162/jocn_a_01588.
- Byrne KN, McDevitt EA, Sheremate SL, Peters MW, Mednick SC & Silver MA, Transient cholinergic enhancement does not significantly affect either the magnitude or selectivity of perceptual learning od visual texture discrimination. Journal of Vision 2020 20(6):5, 1-7, doi.org/10.1167/jov.20.6.5.
- Yetton B, Cai DJ. Spoormaker VI, Silva AJ, & Mednick SC, Human Memories Can Be Linked by Temporal Proximity, Frontiers in Human Neuroscience, Sept 2019, Vol 13, Article 315, doi: 10.3389/fnhum.2019.00315
- Zhang, J, Yetton, B, Whitehurst LN, Naji M, & Mednick SC, The effect of zolpidem on memory consolidation over a night of sleep. SleepJ, Apr 24 2020, doi: 10.1093/sleep/zsaa084
- Whitehurst, L. N., Agosta, S., Castaños, R., Battelli, L., & Mednick, S. C. (2019). The impact of psychostimulants on sustained attention over a 24-h period. Cognition, 193, 104015, doi.org/10.1016/j.cognition.2019.104015.
- Liu, J., Feng, R., Ji, X., Cui, N., Raine, A., & Mednick, S. C. (2019). Midday napping in children: Associations between nap frequency and duration across cognitive, positive psychological well-being, behavioral, and metabolic health outcomes. Sleep. doi:10.1093/sleep/zsz126
- Tselha, T., Whitehurst, L. N., Yetton, B. D., Vo, T. T., & Mednick, S. C. (2019). Morning stimulant administration reduces sleep and overnight working memory improvement. Behavioural Brain Research, 370, 111940. doi:10.1016/j.bbr.2019.111940
- Cellini, N., & Mednick, S. C. (2019). Stimulating the sleeping brain: Current approaches to modulating memory-related sleep physiology. Journal of Neuroscience Methods, 316, 125-136. doi:10.1016/j.jneumeth.2018.11.011
- Naji, M., Krishnan, G. P., Mcdevitt, E. A., Bazhenov, M., & Mednick, S. C. (2019). Timing between Cortical Slow Oscillations and Heart Rate Bursts during Sleep Predicts Temporal Processing Speed, but Not Offline Consolidation. Journal of Cognitive Neuroscience, 1-7. doi:10.1162/jocn_a_01432
- Cellini, N., Shimizu, R. E., Connolly, P. M., Armstrong, D. M., Hernandez, L. T., Polakiewicz, A. G., … & Simons, S. (2019). Short duration repetitive transcranial electrical stimulation during sleep enhances declarative memory of facts. Frontiers in Human Neuroscience, 13, 123.
- Sattari, N., Whitehurst, L. N., Ahmadi, M., & Mednick, S. C. (2019). Does working memory improvement benefit from sleep in older adults? Neurobiology of Sleep and Circadian Rhythms. doi:10.1016/j.nbscr.2019.01.001
- Naji, M., Krishnan, G. P., McDevitt, E. A., Bazhenov, M., & Mednick, S. C. (2018). Coupling of autonomic and central events during sleep benefits declarative memory consolidation. Neurobiology of Learning and Memory, 157, 139-150. doi:10.1016/j.nlm.2018.12.008
- Malerba, P., Whitehurst, L. N., Simons, S. B., & Mednick, S. C. (2018). Spatio-temporal structure of sleep slow oscillations on the electrode manifold and its relation to spindles. Sleep.
- McDevitt, E. A., Sattari, N., Duggan, K. A., Cellini, N., Whitehurst, L. N., Perera, C., … & Mednick, S. C. (2018). The impact of frequent napping and nap practice on sleep-dependent memory in humans. Scientific reports, 8(1), 15053.
- Schapiro, A.C., McDevitt E.A., Rogers T.T., Mednick S.C. & Norman K.A. Human hippocampal replay during rest prioritizes weakly learned information and predits memory performance NATURE COMMUNICATIONS (2018) 9:3920 DOI: 10.1038/s41467-018-06213-1
- Baker, F. C., Sattari, N., de Zambotti, M., Goldstone, A., Alaynick, W. A., & Mednick, S. C. (2018). Impact of sex steroids and reproductive stage on sleep-dependent memory consolidation in women. Neurobiology of learning and memory.
- Yetton, B. D., McDevitt, E. A., Cellini, N., Shelton, C., & Mednick, S. C. (2018). Quantifying sleep architecture dynamics and individual differences using big data and Bayesian networks. PloS one, 13(4), e0194604.
- Whitehurst, L. N., Naji, M., & Mednick, S. C. (2018). Comparing the cardiac autonomic activity profile of daytime naps and nighttime sleep. Neurobiology of Sleep and Circadian Rhythms, 5, 52-57.
- Shimizu, R. E., Connolly, P. M., Cellini, N., Armstrong, D. M., Hernandez, L. T., Estrada, R., Aguilar, M., Weisend, M., Mednick, S.C., & Simons, S. B. (2018). Closed-Loop Targeted Memory Reactivation during Sleep Improves Spatial Navigation. Frontiers in human neuroscience, 12, 28.
- Thurman, S. M., Wasylyshyn, N., Roy, H., Lieberman, G., Garcia, J. O., Asturias, A., Okafor, G.N., Elliott, J.C., Giesbrecht, B., Grafton, S.T., Mednick, S. C., & Vettel, J.N., (2018). Individual differences in compliance and agreement for sleep logs and wrist actigraphy: A longitudinal study of naturalistic sleep in healthy adults. PloS one, 13(1), e0191883.
- Ahmadi, M., McDevitt, E. A., Silver, M. A., & Mednick, S. C. (2017). Perceptual learning induces changes in early and late visual evoked potentials. Vision research.
- Schapiro, A. C., McDevitt, E. A., Chen, L., Norman, K. A., Mednick, S. C., & Rogers, T. T. (2017). Sleep Benefits Memory for Semantic Category Structure While Preserving Exemplar-Specific Information. Scientific Reports, 7(1), 14869.
- Sattari, N., McDevitt, E. A., Panas, D., Niknazar, M., Ahmadi, M., Naji, M., Baker, F., & Mednick, S. C. (2017). The effect of sex and menstrual phase on memory formation during a nap. Neurobiology of learning and memory, 145, 119-128.
- Obradovich, N., Migliorini, R., Mednick, S. C., & Fowler, J. H. (2017). Nighttime temperature and human sleep loss in a changing climate. Science advances, 3(5), e1601555.
- McDevitt, E. A., Krishnan, G. P., Bazhenov, M., & Mednick, S. C. (2017). The Role of Sleep Spindles in Sleep-Dependent Memory Consolidation. In Cognitive Neuroscience of Memory Consolidation (pp. 209-226). Springer International Publishing.
- Duggan KA, McDevitt EA, Whitehurst LN, Mednick SC (2016) To nap, perchance to DREAM: A factor analysis of college students’ self-reported reasons for napping. Behavioral Sleep Medicine.
- Whitehurst L, Cellini N, McDevitt EA, Duggan KA, Mednick SC (2016) Autonomic activity during sleep predicts memory consolidation in humans. Proceedings of the National Academy of Sciences
- Cellini N, Whitehurst, LN, McDevitt EA, Mednick, SC (2015). Heart rate variability during daytime naps in healthy adults: Autonomic profile and short-term reliability. Psychophysiology.
- Cellini N, Goodbourn PT, McDevitt EA, Martini P, Holcombe AO, Mednick SC (2015). Sleep after practice reduces the attentional blink. Attention, Perception & Psychophysics.
- Kastellakis G, Cai DJ, Mednick SC, Silva AJ, Poirazi P. Synaptic clustering within dendrites: An emerging theory of memory formation (2015). Progress in Neurobiology.
- McDevitt EA, Duggan KA, Mednick SC (2015). REM sleep rescues learning from interference. Neurobiology of Learning and Memory.
- Niknazar M, Krishnan GP, Bazhenov M, Mednick SC. (2015). Coupling of Thalamocortical Sleep Oscillations Are Important for Memory Consolidation in Humans. PLoS One. 10(12). e0144720.
- Yetton BD, Niknazar M, Duggan KA, McDevitt EA, Whitehurst LN, Sattari N, Mednick SC. (2015). Automatic detection of rapid eye movements (REMs): A machine learning approach. J Neurosci Methods.
- Duggan, K. A., Friedman, H. S., McDevitt, E. A., & Mednick, S. C. (2014). Personality and healthy sleep: The importance of conscientiousness and neuroticism. PLOS ONE, 9(3), e90628.
- Cellini N, McDevitt EA, Ricker AA, Mednick SC (2014). Validation of an automated wireless system for sleep monitoring during daytime naps. Behavioral Sleep Medicine: 1-12.
- McDevitt E. A., Rowe K. M., Brady M., Duggan K. A., Mednick S. C.(2014), The benefit of offline sleep and wake for novel object recognition. Experimental brain research, 232(5), 1487-1496
- McDevitt E. A., Rokem, A., Silver, M. A, &Mednick, S. C.(2014). Sex differences in sleep-dependent perceptual learning. Vision research, 99, 172-179.
- Mednick, S. C. (2013). Naps. Encyclopedia of Sleep.
- Mednick, S. C. (2013). Napping helps preschoolers learn. Proceedings of the National Academy of Sciences, 110(43), 17171-17172.
- Cellini, N., Buman M. P., McDevitt, E. A., Ricker, A. A,, & Mednick, S. C.(2013). Direct comparison of two actigraphy devices with polysomnographically recorded naps in healthy young adults. Chronobiology International, 30(5), 691-698.
- Feupe S. F., Frias P. F., Mednick, S. C., McDevitt, E. A., & Heintzman, N. D.(2013). Nocturnal Continuous Glucose and Sleep Stage Data in Adults with Type 1 Diabetes in Real-World conditions. Journal of diabetes science and technology, 7(5), 1337-1345.
- Brakefield, T. A., Mednick, S. C.,Wilson, H. W., De Neve, J. E., Christakis, N. A., Fowler, J. H. (2014). Same-sex sexual atraction does not spread adolescent social networks. Archives of sexual behavior, 43(2), 335-344.
- Mednick, S. C., McDevitt, E. A., Walsh, J. K., Wamsley, E., Paulus, M., Kanady, J C., & Drummond, S. P. (2013). The critical role of sleep spindles in hippocampal-dependent memory: a pharmacology study. The Journal of Neuroscience, 33(10), 4494-4504.
- Kaestner, E. J., Wixted, J. T., & Mednick, S. C. (2013). Pharmacologically increasing sleep spindles enhances recognition for negative and high-arousal memories. Journal of cognitive neuroscience, 25(10), 1597-1610.
- McDevitt, E. A., Alaynick, W. A., & Mednick, S. C, (2012). The effect of nap frequency on daytime sleep architecture. Physiology & behavior, 107(1), 40-44.
- Gupta, N., Jang, Y., Mednick, S. C., & Huber, D. E. (2012). The road not taken creative solutions require avoidance of high-frequency responses. Psychological Science, 0956797611429710.
- Mednick, S. C., Cai, D. J., Shuman, T., Anagnostaras, S., & Wixted, J. T. (2012). An opportunistic theory of cellular and systems consolidation. Trends in neurosciences, 34(10), 504-514.
- Harrison, E. M., Gorman, M. R., Mednick, S. C. (2011). The effect of narrowband 500nm light on daytime sleep in humans. Physiology & Behavior, 103(2), 197-202.
- Kanady, J. C., Drummond,S., & Mednick, S. C. (2011). Actigraphic assessment of a polysomnographic-recorded nap: a validation study. Journal of sleep research, 20(1 Pt 2), 214-222.
- Rieth, C. A., Cai, D. J., McDevitt, E. A., & Mednick, S. C., (2010). The role of sleep and practice in implicit and explicit motor learning. Behavioural brain research, 214(2), 470-474.
- Mednick, S. C., & Alaynick, W. A. (2010). Comparing models of sleep-dependent memory consolidation, Journal of Experimental & Clinical Medicine, 2(4), 156-164.
- Mednick, S. C., Christakis, N. A., & Fowler, J. H. (2010). The spread of sleep loss influences drug use in adolescent social networks. PloS one, 5(3), e9775.
- Cai, D. J., Mednick, S. A., Harrison, E. M., Kanady, J. C., & Mednick, S, C. (2009). REM, not incubation, improves creativity by priming associative networks. Proceedings of the National Academy of Sciences, 106(25), 10130-10134.
- Mednick SC, “Sleep and Dreams”, Encyclopedia of Perception; Editor-in-chief, Bruce Goldstein, 2009, SAGE Publications, Inc
- Mednick, S. C., Makovski, T., Cai, D. J., & Jiang, Y. V. (2009). Sleep and rest facilitate implicit memory in a visual search task. Vision research, 49(21), 2557-2565.
- Mednick, S. C., Drummond, S. P., Arman, A. C., & Boynton, G. M. (2008). Perceptual deterioration is reflected in the neural response: fMRI study between nappers and non-nappers. Perception, 37(7), 1086.
- Mednick SC, Drummond SPA, “Naps” in The New Encyclopedia of Neuroscience eds. Squire L, Albright T, Elsevier London, 2008.
- Mednick, S. C., Cai, D J., Kanady, J., & Drummond, S. (2008). Comparing the benefits of caffeine, naps and placebo on verbal, motor, and perceptual memory. Behavioral brain research, 193(1), 79-86.
- Mednick, S. C., Drummond, S., Boynton, G. M., Awh, E., & Serences, J. (2008). Sleep-dependent learning and practice-dependent deterioration in an orientation discrimination task, Behavioral neuroscience, 122(2), 267.
- Mednick, S. C., Arman, A. C., & Boynton, G. M, (2005). The time course and specificity of perceptual deterioration. Proceedings from the National Academy of Sciences of the United States of America, 102(10), 3881-3885.
- Mednick, S. C., Drummond, S. P. (2004). Study in focus. Literature reviews.
- Mednick, S. C., Nakayama, K., & Stickgold, R. (2003). Sleep-dependent learning: a nap is as good as a night, Nature neuroscience, 6(7), 697-698.
- Mednick, S. C., Nakayama, K., Cantero, J. L., Atienza, M., Levin, A. A., Pathak, N., & Stickgold, R. (2002). The restorative effect of naps on perceptual deterioration, Nature neuroscience, 5(7), 677-681.
News and Video
UCR Today: How to Sleep Better (2016)
How to Sleep Better And The Secret Power of Naps (2016)
Huffington Post (2016)
CNN Health & Wellness (2016)
Examining Sleep’s Roles in memory and Learning (2016)
Stone Riverside Magazine (2016)
Wall Street Journal (2013)
Science AAAS (2013)
Science Daily (2013)
NY Times (2013)
Bloomberg Businessweek (2010)
Scientist As A Star (2010)
NY Times (2008)
Wall Street Journal (2008)
Washington Post (2008)
NY Times (2007)
Bloomberg Business Week (2006)
Dr. Mednick on Brain Games-Sleep Deprived
We are currently recruiting participants for our ongoing sleep studies!
Individuals aged 18 and over and who speak English can participate, and responses are completely anonymous. You will not be compensated for taking the survey, but you will learn whether you are eligible to participate in any of our ongoing research studies. Although there are no other direct benefits to you for taking the survey, our research has helped society learn more about the relations between sleep, memory, and health. The survey takes approximately 30 minutes to complete, and your responses are completely anonymous.
If you would like to participate in the survey, you can do so in three ways: (1) click the link below and take the survey online; (2) call or email us and you can take the survey over the phone; (3) call or email us and you can take the survey in-person. You can take the survey in the format you prefer. You will receive your results within 4-6 weeks.
If you know anyone who might be interested in participating in this survey, please forward them this message. If you have any questions about the study, do not hesitate to contact us at (949)824-2684. If you have any questions about your rights as a research subject you can contact the UCI Office of Research, Human Research Protections, at (949)824-7295.
Currently recruiting studies are listed below:
Study Title: Sleep Cycles
Study Description: The research we are conducting aims to investigate the relationship between sex hormones and sleep related memory consolidation among young adults. This is a research study because we are monitoring sleeping behavior, recording nighttime sleep in the lab, and administering cognitive tasks in order to investigate our hypotheses about sleep architecture and memory. The experiment will involve cognitive testing and EEG-recorded sleep over five visits at the Sleep and Cognition Lab at UC Irvine. On the morning of each visit, a blood sample (about 3-teaspoon) will be collected by a certified phlebotomist.
Time commitment: two-three months.
Instructions: Please complete this recruitment survey to determine eligibility, the study team will follow up with you in 2-3 weeks: https://cutt.ly/SleepCycles
Contact: email@example.com or 949-824-2684
Study Title: Targeted Stimulation for Enhancing Replay with Active Closed-Loop Therapy (TSERACT)
Study Description: The purpose of this study is to further our understanding of human memory and identify approaches to enhance memory following a daytime nap. This study involves
cognitive tasks and a 90-minute nap with transcranial alternate current (tACS) to enhance naturally occurring brain activities during sleep. (tACS delivers a low-intensity sinusoid (<2 mA) current across electrodes on the scalp.)
Time commitment: Your participation will be one orientation session and three experimental visits. You will be randomly assigned to one of 3 intervention sequences: active wake, nap with active tACS stimulation, nap with sham stimulation (placebo). The total time required will be approximately 20 hours.
Instructions: Please complete this recruitment survey to determine eligibility, a study team member will follow up with you within 2-3 weeks: https://cutt.ly/tseract
Study Contact: firstname.lastname@example.org
Study Title: The Effect of Sleep on First Impressions
Study Description: We are recruiting participants for a research study about how the brain and body respond to first impressions and sleep. This study may help us to better understand the influence of sleep on creating first impressions. As part of participating, you will be asked to complete surveys, undergo an interview, and have your physiological responses measured. Study may require taking a nap while brain recordings are taken.
Time commitment: Your participation will last up to 5 hours and 30 minutes for 1 day and 30-35 minutes on a 2nd day, 2 days later.
Instructions: Please complete this recruitment survey to determine eligibility, a study team member will follow up with you within 2-3 weeks: https://cutt.ly/impressions
Study Contact: email@example.com
Study Title: Using targeted memory reactivation during sleep in weak and strong memories
Study Description: Studies have shown that the neuronal network active during encoding of a memory gets reactivated during sleep. This reactivation may be important for strengthening of the memory. The purpose of this study is to explore brain mechanisms that underlie reactivation during sleep that support memory formation and strengthening.
Time commitment: One orientation session(1 hour) and one study day visit (~5.5 hours)
Instructions: Please complete this recruitment survey to determine eligibility, a study team member will follow up with you within 2-3 weeks: https://cutt.ly/slumberparty
Study Contact: slumberpartystudy@
JOIN OUR LAB!
The Sleep and Cognition (SaC) Lab of the Department of Cognitive Science at the University of California, Irvine is soliciting applications from psychologists and neuroscientists for a postdoctoral research position on sleep, learning and memory and aging. The researcher will work with existing and ongoing data sets related to the effect of pharmacology and sleep on memory consolidation in young and older populations. Successful candidates should have experience in sleep, pharmacology or aging research and possess a doctoral degree. Minority candidates are especially encouraged to apply. The University of California offers excellent benefits. Salary is based on research experience. The initial appointment is for 1 year with a possibility of extension. The candidate will be expected to apply for extramural funding at the appropriate time. Please send your CV, statement of research interests and the names of three references or make inquires to Sara C. Mednick (firstname.lastname@example.org).
Prospective Graduate Students
The Sleep and Cognition (SaC) Lab of the Department of Cognitive Science at the University of California, Irvine is accepting applications for graduate students to start in the Fall of 2019. Our lab is interested in a wide range of topics, including the effect of sleep on memory, mechanisms of memory processing, pharmacological effects on memory, aging, psychosocial and social network effects on health behaviors. Minority candidates are especially encouraged to apply. Please make inquires to Sara C. Mednick (email@example.com).
The Sleep and Cognition (SaC) Lab is currently accepting applications for research assistants. Research Assistants in the lab may be involved in any aspects of experiments, including recruiting and screening potential subjects, running human subjects in experimental procedures (informed consent, psychophysics, polysomnography), data coding and analysis, and helping with other needed tasks. The minimum time commitment is 12 hours/week for at least 1 year (4 quarters). You must be willing to occasionally work overnight and weekends in the lab. As a Research Assistant in our lab, you can register for 2-4 credits per quarter, P/NP. After working in the lab for 3 quarters, research assistants can register for 2-4 credits per quarter for a letter grade. If you are interested, please use the link below and email your application and your resume as attachments to Tenzin Tselha (firstname.lastname@example.org). We will contact you in the near future if we think you are a good candidate for our lab.
Now Hiring: Study Coordinator
We are seeking a full-time, study coordinator in Sara Mednick’s Sleep and Cognition (SaC) Lab at UC Irvine. Our seven-bedroom, on-campus sleep lab is an exciting research environment that runs both daytime and nighttime studies. The study coordinator oversees and coordinates the day-to-day operations of the lab to include oversight and purchasing of supplies, grants management, general lab organization, maintaining a large corpus of data from EEG, ECG, functional magnetic resonance imaging (fMRI), maintenance of EEG hardware, technical support for laboratory computers, behavioral measures, and submission of IRB protocols. Experience in a management position is necessary. Experience (or willingness to get certified) as a phlebotomist is a plus. This position includes the opportunity to acquire skills on a variety of research methods and techniques, along with mentoring of undergrad and graduate students.
Preference will be given to those with prior related research experiences and/or management experience. The position is to start as soon as possible. We are looking for someone interested in making a long-term commitment to the lab.
If interested, please email your resume and cover letter to Dr. Sara Mednick (email@example.com)
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