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Odor Cues During Slow Wave Sleep Prompt Declarative Memory

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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 SWSeventually 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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posted:9/25/2012
language:English
pages:13