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Odor Cues During Slow-Wave Sleep Prompt Declarative Memory Consolidation Rasch, B., Buchel, C., Gais, S., & Born, J. Presented by: Suiki Zhang Introduction sleep facilitates the consolidation of newly acquired memories for long-term storage Consolidation of hippocampus-dependent memories benefits particularly from slow- wave sleep (SWS) Odours are excellent contextual retrieval cues for various types of memories Introduction Purpose: used an odour to reactivate memories in human during sleep Hypothesis: odour-induced reactivations boosting the consolidation of hippocampus- dependent declarative memories are related to hippocampal activity during SWS Methods 18 participants Olfactory stimulus = smell of a rose Learned a 2D object location task (locations of 15 card pairs on a computer screen) & a procedural finger-tapping task in the evening before sleep 4 different conditions Methods Results Re-exposure to the odour during SWS improved the retention of hippocampus- dependent memories but not of hippocampus-independent procedural memories Odour re-exposure was ineffective during REM sleep or wakefulness or when the odour had been omitted prior learning Results Results Discussion Odour cues activate the hippocampus during SWS to a much greater extent than during wakefulness Supports the theory that memory consolidation evolves from repeated reactivation of newly encoded hippocampal memory during SWSeventually leads to transfer of the memory to cortical regions for long term storage My Opinion Strengths: - Clear diagrams/graphs - Interesting study Weaknesses: - unorganized; no headings for sections Next steps: - Examine whether the type of the odour would have different effects Cited Article Rasch, B., Buchel, C., Gais, S., & Born, J. (2007). Odor cues during slow-wave sleep prompt declarative memory consolidation. Science magazine, 315, 1426-1429. Questions?
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