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Reward + Nap = Improved Memory and Learning

Reward + Nap = Improved Memory and Learning

A new study suggests that when the learning process is accompanied by positive reinforcement, and then followed by a nap, memory improves.

Specifically, researchers from the University of Geneva discovered memories associated with a reward are preferentially reinforced by sleep. A short nap after a period of learning appears to augment the learning and memory process.

The findings appear in the journal eLife.

“Rewards may act as a kind of tag, sealing information in the brain during learning,” said lead researcher Dr. Kinga Igloi from the University of Geneva.

“During sleep, that information is favorably consolidated over information associated with a low reward and is transferred to areas of the brain associated with long-term memory.”

“Our findings are relevant for understanding the devastating effects that lack of sleep can have on achievement,” she says.

Thirty-one healthy volunteers were randomly assigned to either a sleep group or a “wake” group and the sensitivity of both groups to reward was assessed as being equal.

Participants’ brains were scanned while they were trained to remember pairs of pictures. Eight series of pictures were shown and volunteers were told that remembering pairs in four of them would elicit a higher reward.

Following a 90-minute break of either sleep or rest, they were tested on their memory for the pairs and asked to rate how confident they were about giving a correct answer. Participants were also asked to take part in a surprise test of exactly the same nature three months later.

Each group responded better for highly rewarded picture pairs, but the sleep group performed better overall. Saliently, during the surprise test three months later participants who had slept after learning were selectively better for the highly rewarded pairs.

The people who slept were also more confident of achieving a correct answer during the memory tests, even after three months.

MRI scans revealed that the sleep group experienced greater activity of the hippocampus, a small area of the brain critical for forming memories. This correlated with a higher number of bursts of brain activity called slow spindles.

After three months, the sleep group also showed increased connectivity between the hippocampus, the medial prefrontal cortex and the striatum, areas of the brain implicated in memory consolidation and reward processing.

“We already knew that sleep helps strengthens memories, but we now also know that it helps us select and retain those that have a rewarding value,” says Igloi.

“It makes adaptive sense that the consolidation of memory should work to prioritize information that is critical to our success and survival.”

Source: University of Geneva/EurekAlert

Reward + Nap = Improved Memory and Learning

Rick Nauert PhD

Rick Nauert, PhDDr. Rick Nauert has over 25 years experience in clinical, administrative and academic healthcare. He is currently an associate professor for Rocky Mountain University of Health Professionals doctoral program in health promotion and wellness. Dr. Nauert began his career as a clinical physical therapist and served as a regional manager for a publicly traded multidisciplinary rehabilitation agency for 12 years. He has masters degrees in health-fitness management and healthcare administration and a doctoral degree from The University of Texas at Austin focused on health care informatics, health administration, health education and health policy. His research efforts included the area of telehealth with a specialty in disease management.

APA Reference
Nauert PhD, R. (2015). Reward + Nap = Improved Memory and Learning. Psych Central. Retrieved on August 19, 2018, from https://psychcentral.com/news/2015/10/19/reward-nap-improve-memory-and-learning/93702.html

 

Scientifically Reviewed
Last updated: 19 Oct 2015
Last reviewed: By John M. Grohol, Psy.D. on 19 Oct 2015
Published on PsychCentral.com. All rights reserved.