Effect of emotional and neutral declarative memory consolidation on sleep architecture

Abstract

The relationship between emotional or neutral declarative memory consolidation and sleep architecture was investigated. Thirty university students (21 females) viewed negative, neutral, or positive pictures and rated their valence and arousal in the evening. Participants performed a recognition test 1 h later and then underwent overnight polysomnography. Their post-encoding sleep architecture was compared to a baseline night. Participants returned 6 days following encoding for a second recognition test. Results showed no group (Negative, Neutral, Positive) differences in recognition 1 h or 6 days following encoding. Stage 2 sleep spindle density decreased across all groups following encoding, and recognition after 6 days was positively correlated with Stage 2 sleep spindle density on both nights. There was no change in REM density in any of the groups. This is the first investigation into phasic sleep microarchitecture changes following emotional and neutral declarative learning. Future investigations may benefit from more salient emotional stimuli.

Sleep spindles and general cognitive ability – A meta-analysis

“…All identified papers with the reported effect sizes (Bódizs et al, 2005;Bódizs, Gombos, Ujma, and Kovács, 2014;Chatburn et al, 2013;Fang, Sergeeva, et al, 2017;Fogel and Smith, 2006;Fogel, Nader, Cote, and Smith, 2007;Geiger et al, 2011;Gruber et al, 2013;Hoedlmoser et al, 2014;Lustenberger, Maric, Durr, Achermann, and Huber, 2012;Nader and Smith, 2015;Peters, Smith, and Smith, 2007;Peters, Ray, Smith, and Smith, 2008;Schabus et al, 2006;Tessier et al, 2015;Tucker and Fishbein, 2009;Ujma et al, 2014;Ujma, Bódizs, et al, 2015;Ujma, Sandor, Szakadat, Gombos, and Bodizs, 2016;Ward, Peters, and Smith, 2013) and the studies therein are summarized in Table 1. One paper with a known effect size (Clemens, Fabo, and Halasz, 2006) was excluded, because its sample completely overlapped with another (Bódizs et al, 2005).…”

“…Data about explicitly defined slow and fast spindle densities were available from 12 studies (N = 700). Another eight studies reported results about the relationship between either the total count (Fogel and Smith, 2006;Fogel et al, 2007) or the density (Peters et al, 2007(Peters et al, , 2008Ward et al, 2013) of generic "spindles" (without the identification of slow or fast subtypes) and cognitive ability, which were meta-analyzed together with fast spindles in a different, less selective model (k = 20, N = 853), rendering it the spindle measure with the most available data.…”

Whole-Night Continuous Rocking Entrains Spontaneous Neural Oscillations with Benefits for Sleep and Memory

“…Following the procedure of Ray and colleagues [70], spindles were detected automatically using the PRANA software. The signal was thresholded at 1.96 SD above the mean for spindle detection in each recording [70,71]. This detection is determined based upon each subject's mean peak spindle amplitude for each night.…”

Treatments and regulatory mechanisms of acoustic stimuli on mood disorders and neurological diseases

“…Adequate sleep can regulate emotions, consolidate memory, enhance learning ability, and promote overall well-being (Rasch and Born, 2013;Papalambros et al, 2017;Ramar et al, 2021). Insufficient sleep not only increases the risk of obesity and cardiovascular diseases, but also triggers anxiety, depression and other mental disorders, leading to a decline in cognitive performance (Ward et al, 2014;Muto et al, 2016;Di Muzio et al, 2020;Scott et al, 2021). The Sleep Ambient Music Intervention is an effective therapeutic measure for improving sleep quality and mental health (Loewy, 2020;Chen et al, 2021) (Figure 1).…”