夢を見ることは記憶の定着と感情調節の改善につながる(Dreaming is linked to improved memory consolidation and emotion regulation)

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2024-05-13 カリフォルニア大学校アーバイン校(UCI)

カリフォルニア大学アーバイン校の研究によると、夢を見ることで日常の忘却と極端な出来事の処理が促進されるという。この研究は、夢の記憶と気分が翌日の記憶の定着と感情調節にどう影響するかを調査し、感情的な記憶が優先されつつその強度が和らげられるというトレードオフがあることを示しています。夢が私たちの感情体験を処理する手助けをしていることが示され、夢が感情的な記憶処理に積極的に関与している最初の実証的証拠を提供しています。これにより、感情的な体験後に夢を見ることが翌朝の気分向上に役立つかもしれません。

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感情的な記憶処理における夢の積極的な役割の証拠は、私たちが忘れるために夢を見ることを示している Evidence of an active role of dreaming in emotional memory processing shows that we dream to forget

Jing Zhang,Andres Pena,Nicole Delano,Negin Sattari,Alessandra E. Shuster,Fiona C. Baker,Katharine Simon & Sara C. Mednick
Scientific Reports  Published:15 April 2024
DOI:https://doi.org/10.1038/s41598-024-58170-z

夢を見ることは記憶の定着と感情調節の改善につながる(Dreaming is linked to improved memory consolidation and emotion regulation)

Abstract

Dreaming is a universal human behavior that has inspired searches for meaning across many disciplines including art, psychology, religion, and politics, yet its function remains poorly understood. Given the suggested role of sleep in emotional memory processing, we investigated whether reported overnight dreaming and dream content are associated with sleep-dependent changes in emotional memory and reactivity, and whether dreaming plays an active or passive role. Participants completed an emotional picture task before and after a full night of sleep and they recorded the presence and content of their dreams upon waking in the morning. The results replicated the emotional memory trade-off (negative images maintained at the cost of neutral memories), but only in those who reported dreaming (Dream-Recallers), and not in Non-Dream-Recallers. Results also replicated sleep-dependent reductions in emotional reactivity, but only in Dream-Recallers, not in Non-Dream-Recallers. Additionally, the more positive the dream report, the more positive the next-day emotional reactivity is compared to the night before. These findings implicate an active role for dreaming in overnight emotional memory processing and suggest a mechanistic framework whereby dreaming may enhance salient emotional experiences via the forgetting of less relevant information.

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