The scent of a rose improves learning during sleep

Summary: The smell of roses while learning and during sleep helps increase memory and learning skills. The study reports a significant increase in learning success by 30% if a person is exposed to the smell of roses during both learning and sleep phases.

Source: University of Freiburg

Effortless learning during sleep is the dream of many people. The supportive effect of smells on learning success when presented both during learning and sleep was first proven in an extensive sleep laboratory study. Researchers at the University of Freiburg – Medical Center, the Freiburg Institute for Frontier Areas of Psychology and Mental Health (IGPP) and the Faculty of Biology at the University of Freiburg have now shown that this effect can be also achieved very easily outside the lab. For the study, pupils in two school classes learned English vocabulary – with and without scent sticks during the learning period and also at night. The students remembered the vocabulary much better with a scent. The study was published in the Nature Group’s Open Access journal Scientific Reports on 27 January 2020.

“We showed that the supportive effect of fragrances works very reliably in everyday life and can be used in a targeted way,” said study leader PD Dr. Jürgen Kornmeier, head of the Perception and Cognition Research Group at the Freiburg-based IGPP and scientist at the Department of Psychiatry and Psychotherapy at the University of Freiburg – Medical Center in Germany.

The smell of roses when learning and sleeping

For the study, first author and student teacher Franziska Neumann conducted several experiments with 54 students from two 6th grade classes of a school in southern Germany. The young participants from the test group were asked to place rose-scented incense sticks on their desks at home while learning English vocabulary and on the bedside table next to the bed at night. In another experiment, they also placed the incense sticks on the table next to them during a vocabulary test at school during an English test. The results were compared with test results in which no incense sticks were used during one or more phases.

This shows a sleeping woman wiht a rose next to her nose
Neuroscience, neurobiology, brain research, open access, open science, learning, Memory, olfaction, sleep, neuroplasticity, University of Freiburg

“The students showed a significant increase in learning success by about 30 percent if the incense sticks were used during both the learning and sleeping phases,” says Neumann. The results also suggest that the additional use of the incense sticks during the vocabulary test promotes memory.

Findings are suitable for everyday use

“One particular finding beyond the seminal initial study was, that the fragrance also works when it is present all night,” says Kornmeier. “This makes the findings suitable for everyday use.” Previous studies had assumed that the fragrance needs to be only present during a particularly sensitive sleeping phase. However, since this sleep phase needs to be determined by an effortful measurement of brain activity by means of an electroencephalogram (EEG) in the sleep laboratory, this finding was not suitable for everyday use. “Our study shows that we can make learning during sleep easier. And who would have thought that our nose could help considerably in this,” says Kornmeier.

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Source:
University of Freiburg
Media Contacts:
Jürgen Kornmeier – University of Freiburg
Image Source:
The image is in the public domain.

Original Research: Open access
“How odor cues help to optimize learning during sleep in a real life-setting”. Franziska Neumann, Vitus Oberhauser & Jürgen Kornmeier.
Scientific Reports doi:10.1038/s41598-020-57613-7.

Abstract

How odor cues help to optimize learning during sleep in a real life-setting

Effortless learning during sleep is everybody’s dream. Several studies found that presenting odor cues during learning and selectively during slow wave sleep increases learning success. The current study extends previous research in three aspects to test for optimization and practical applicability of this cueing effect: We (1) performed a field study of vocabulary-learning in a regular school setting, (2) stimulated with odor cues during the whole night without sleep monitoring, and (3) applied the odor additionally as retrieval cue in a subsequent test. We found an odor cueing effect with comparable effect sizes (d between 0.6 and 1.2) as studies with sleep monitoring and selective cueing. Further, we observed some (non-significant) indication for a further performance benefit with additional cueing during the recall test. Our results replicate previous findings and provide important extensions: First, the odor effect also works outside the lab. Second, continuous cueing at night produces similar effect sizes as a study with selective cueing in specific sleep stages. Whether odor cueing during memory recall further increases memory performance hast to be shown in future studies. Overall, our results extend the knowledge on odor cueing effects and provide a realistic practical perspective on it.

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