par Gilson, Medhi 
;Deliens, Gaétane ;Peigneux, Philippe
Référence BAPS Annual Meeting (May 27, 2014: Liège, Belgium)
Publication Non publié, 2014-05-27
;Deliens, Gaétane ;Peigneux, Philippe Référence BAPS Annual Meeting (May 27, 2014: Liège, Belgium)
Publication Non publié, 2014-05-27
Communication à un colloque
| Résumé : | The role of sleep for memory consolidation is now well documented, but less is known about the role of sleep for the processing of memories associated with an emotional context. In a series of three studies, we investigated whether sleep, and especially Rapid Eye Movement (REM) sleep, promotes unbinding between neutral memories and their emotional envelope, as suggested by van der Helm & Walker (2009). In a first study (Deliens & al., 2012), participants were induced in a sad or happy mood, being instructed to imagine themselves in a sad or happy situation while listening to congruent emotional musical excerpts. After this mood induction phase, they learned a series of neutral word pairs, had a regular sleep night or were deprived of sleep, and then had 2 regular nights of sleep. At day four, participants had to recall half of the word pairs after induction of the same mood context than at learning, and the other half of word pairs after induction of the opposite mood context. Our results disclosed a mood-dependent memory [MDM] effect (i.e. higher performance in same than different mood context) after sleep deprivation but not after regular sleep, suggesting a protective role of sleep against emotional interference. These results were in line with the Sleep to Forget and Sleep to Remember (SFSR) proposal (Van der Helm & Walker 2009) that emotional memories are reactivated during REM sleep, leading to the reprocessing of emotional experiences and unbinding the affective tone initially associated with the memories. In a second study (Deliens & al., 2013a), we tested the specific hypothesis that REM sleep subtends the demodulation process. The learning procedure was similar to the first study, unless participants benefitted after learning from 3 hours of early sleep (NREM sleep dominant) vs. 3 hours of late sleep (REM sleep dominant). Results revealed a MDM effect in both NREM and REM sleep conditions, failing to support the proposal of a specific role for REM sleep in the demodulation of the emotional context of memories. Finally, we tested the hypothesis that several sleep NREM/REM cycles are actually needed to unbind memories from their emotional context (Deliens & Peigneux 2013b). Again, results revealed a MDM effect both after a full night of sleep or a day awake, suggesting that the demodulation process needs several nights to achieve. |
