Effects of all-night exposure to ambient odour on dreams and affective state upon waking

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023752%3A_____%2F21%3A43920535" target="_blank" >RIV/00023752:_____/21:43920535 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11120/21:43920825 RIV/00216208:11240/21:10419212

Result on the web

<a href="https://www.sciencedirect.com/science/article/abs/pii/S0031938420305795" target="_blank" >https://www.sciencedirect.com/science/article/abs/pii/S0031938420305795</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.physbeh.2020.113265" target="_blank" >10.1016/j.physbeh.2020.113265</a>

Result language

angličtina

Original language name

Effects of all-night exposure to ambient odour on dreams and affective state upon waking

Original language description

Previous laboratory research has shown that exposure to odours of contrasting pleasantness during sleep differentially affects the emotional tone of dreams. In the present study, we sought to investigate how a generally pleasant (vanillin) and unpleasant (thioglycolic acid [TGA]) smell influenced various dream characteristics, dream emotions, and post-sleep core affect during all-night exposure, controlling for appraisal of the olfactory environment during the assessments and sleep stage from which the participants woke up. We expected that exposure to vanillin would result in more pleasant dreams, more positive and less negative dream emotions, and a more positive post-sleep core affect compared to the control condition, whereas exposure to TGA would have the opposite effect. Sixty healthy volunteers (36 males, mean age 24 ± 4 years) were invited to visit the sleep laboratory three times in weekly intervals. The first visit served to adapt the participants to the laboratory environment. On the second visit, half the participants were exposed to an odour (vanillin or TGA, 1:1) and the other half to the odourless control condition. On the third visit, they received control or exposure in a balanced order. On each visit, the participants woke up twice, first from the rapid eye movement (REM) sleep stage and then in the morning, usually from a non-REM sleep stage. Repeated measures were taken upon each awakening. Dream pleasantness, emotional charge of the dream, positive and negative emotions experienced in the dream, and four dimensions of post-sleep core affect (valence, activation, pleasant activation – unpleasant deactivation, and unpleasant activation – pleasant deactivation) were assessed. We found a small effect of condition (exposure vs. control) in interaction with appraisal of the ambient olfactory environment on dream pleasantness. Specifically, false alarms (i.e., perceiving odour in the absence of the target stimulus) were associated with lower dream pleasantness than correct rejections. Although exposure had a statistically significant positive influence on post-sleep core affect (namely, valence, activation, and pleasant activation – unpleasant deactivation), the size of the effect was small and lacked practical significance. The hypothesised differential effects of vanillin and TGA were only modelled for dream ratings because they decreased the fit of the other models. Neither dream pleasantness nor emotionality differed according to the odour used for stimulation. The results of the present study suggest that all-night exposure to odours is unlikely to produce practically significant positive effects on dreams and post-sleep core affect.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

50101 - Psychology (including human - machine relations)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physiology &amp; Behavior

ISSN

0031-9384

e-ISSN

—

Volume of the periodical

230

Issue of the periodical within the volume

March

Country of publishing house

GB - UNITED KINGDOM

Number of pages

15

Pages from-to

113265

UT code for WoS article

000612184600003

EID of the result in the Scopus database

2-s2.0-85098934245