No effect of targeted memory reactivation during sleep on retention of vocabulary in adolescents.

Scientific Reports
Ines WilhelmBjörn Rasch

Abstract

Re-exposure of newly acquired vocabulary during sleep improves later memory recall in healthy adults. The success of targeted memory reactivation (TMR) during sleep presumably depends on the presence of slow oscillations (i.e., EEG activity at a frequency of about 0.75 Hz). As slow oscillating activity is at its maximum during adolescence, we hypothesized that TMR is even more beneficial at this developmental stage. In the present study, adolescents aged 11 to 13 learnt Dutch vocabulary in the evening and were tested on recall performance the next morning. Half of the words were presented via loudspeakers during post-learning periods of NREM (Non Rapid Eye Movement) sleep in order to stimulate memory reactivation. Unexpectedly, TMR during sleep did not improve memory on the behavioral level in adolescents. On the oscillatory level, successful reactivation during sleep resulted in the characteristic increase in theta power over frontal brain regions, as reported in adults. However, we observed no increase in spindle power during successful reactivation. Possible factors that may explain the lacking effect of TMR in adolescents in this study such as differences in learning abilities and pre-sleep performance levels are discussed.

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Citations

Nov 24, 2020·Child and Adolescent Psychiatric Clinics of North America·Karen Spruyt
May 6, 2021·Psychophysiology·Ann-Kathrin JoechnerMarkus Werkle-Bergner
Jul 28, 2020·Current Opinion in Neurobiology·Maren Jasmin Cordi, Björn Rasch

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