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Related Experiment Videos

Functional brain imaging of olfactory processing in monkeys.

J M Boyett-Anderson1, D M Lyons, A L Reiss

  • 1Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, CA 94305, USA.

Neuroimage
|October 7, 2003
PubMed
Summary
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This study used functional magnetic resonance imaging (fMRI) to investigate olfactory processing in squirrel monkeys. Findings reveal similar brain activity patterns to humans, supporting shared neural substrates for smell in primates.

Area of Science:

  • Neuroscience
  • Olfactory System Research
  • Comparative Neuroimaging

Background:

  • Bridging the gap between human and animal olfactory brain system studies is crucial.
  • Functional magnetic resonance imaging (fMRI) is a key tool for studying brain activity.

Purpose of the Study:

  • To conduct an fMRI study of olfaction in squirrel monkeys.
  • To enable direct comparisons between human and nonhuman primate olfactory processing.

Main Methods:

  • High-resolution fMRI at 3 Tesla with specific voxel size (1.25 x 1.25 x 1.2 mm³).
  • Whole-brain imaging using a birdcage coil and gradient-echo spiral pulse sequence.
  • Standard block design with sedated adult male squirrel monkeys, followed by spatial normalization and statistical analysis.

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Main Results:

  • Detected robust odorant-induced brain activations in regions like the orbitofrontal cortex, cerebellum, and piriform cortex.
  • Observed signal changes exceeding 0.6%, significantly higher than expected based on human studies.
  • Found no stimulus intensity effects in the identified regions, consistent with human olfactory data.

Conclusions:

  • Demonstrated the feasibility of studying olfaction in sedated monkeys using human-standard fMRI techniques.
  • Provided novel support for the cerebellum's role in sensory acquisition.
  • Suggested shared neural substrates for olfactory processing between sedated monkeys and humans.