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Human brain function during odor encoding and recognition. A PET activation study

L A Dade1, M Jones-Gotman, R J Zatorre

  • 1Montreal Neurological Institute and Hospital, McGill University, Quebec, Canada. dade@ego.psych.mcgill.ca

Annals of the New York Academy of Sciences
|February 4, 1999
PubMed
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This study used positron emission tomography (PET) to map brain activity during olfactory memory tasks. Findings show distinct brain regions, including the orbitofrontal cortex, are involved in recognizing odors over different time scales.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Medical Imaging

Background:

  • Previous research indicated olfactory stimulation increases regional cerebral blood flow (rCBF) in specific brain areas.
  • Understanding the neural basis of olfactory memory processing is crucial for cognitive neuroscience.

Purpose of the Study:

  • To investigate brain function during various stages of olfactory memory processing.
  • To identify brain regions involved in odor encoding, short-term recognition, and long-term recognition.

Main Methods:

  • Positron emission tomography (PET) scans using H2(15)O methodology.
  • Four tasks were performed: odor encoding, long-term odor recognition, short-term odor recognition, and a control task.
  • Analysis involved coregistering PET and MRI scans, standardizing stereotactic space, and paired image subtractions for rCBF changes.

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Main Results:

  • Significant activation in the right orbitofrontal cortex and bilateral piriform cortices during long-term odor recognition compared to the control task.
  • Activation of the right piriform cortex was observed during short-term odor recognition.
  • Prefrontal cortex involvement was noted during both encoding and retrieval tasks.

Conclusions:

  • Olfactory memory processing engages specific brain networks, including the orbitofrontal cortex and piriform cortex.
  • The findings contribute to understanding the neural underpinnings of olfactory memory.
  • The study sets the stage for discussing the generalizability of hemispheric encoding/retrieval asymmetry theories to olfactory memory.