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Functional MR imaging during odor stimulation: preliminary data

D M Yousem1, S C Williams, R O Howard

  • 1Department of Radiology, and the University of Pennsylvania Smell and Taste Center, University of Pennsylvania Medical Center, Philadelphia 19104, USA.

Radiology
|September 1, 1997
PubMed
Summary
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Brain imaging reveals distinct activation patterns for olfactory and trigeminal nerve stimulation. Repeated olfactory stimulation leads to habituation, while combined olfactory-trigeminal stimulation shows paradoxical activation increases.

Area of Science:

  • Neuroimaging
  • Olfactory Neuroscience
  • Sensory Systems

Background:

  • The human olfactory system processes smell, with distinct pathways for different odorant types.
  • Understanding brain activation patterns is crucial for diagnosing olfactory disorders.

Purpose of the Study:

  • To map brain activation using functional magnetic resonance imaging (fMRI) during olfactory stimulation.
  • To investigate changes in brain activation with repeated olfactory and trigeminal nerve stimulation.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) with a blood-oxygen-level-dependent (BOLD) paradigm.
  • Comparison of odorants selectively stimulating the olfactory nerve versus those stimulating both olfactory and trigeminal nerves.
  • Repetitive olfactory stimulation protocols.

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Main Results:

  • Olfactory nerve stimulation primarily activated the orbitofrontal cortex (Brodmann area 11) with right-sided predominance and mild cerebellar activation.
  • Repeated olfactory stimulation led to decreased brain activation (habituation).
  • Odorants stimulating both olfactory and trigeminal nerves induced broader activation, including cingulate, temporal, cerebellar, and occipital regions, with a sixfold increase in activation upon repeated testing.

Conclusions:

  • Different brain regions are activated by olfactory nerve-mediated versus combined olfactory and trigeminal nerve-mediated odorants.
  • Adding a trigeminal component to olfactory stimulation expands activation to widespread brain areas.
  • Habituation occurs with repeated olfactory stimulation, contrasting with increased activation for combined olfactory-trigeminal stimuli.