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Olfactory activity in the human brain identified by fMRI
V Smejkal1, R Druga, J Tintera
1Institute of Pathological Physiology, Department of Functional Anatomy, 2nd Medical Faculty, Charles University, Prague, Czech Republic. vaclav.smejkal@lfmotol.cuni.cz
Bratislavske Lekarske Listy
|November 5, 2003
Summary
This study used functional magnetic resonance imaging (fMRI) to map brain areas activated by vanillin odor. Results show bilateral activation, with greater response in the right hemisphere, identifying key secondary olfactory areas.
Area of Science:
- Neuroscience
- Olfactory System Research
- Brain Imaging
Background:
- Modern neuroimaging techniques like fMRI and PET allow mapping of brain activity.
- Localization and lateralization data for secondary olfactory areas remain inconsistent.
Purpose of the Study:
- To determine the localization of secondary olfactory brain areas activated by vanillin, a pleasant odor stimulus.
Main Methods:
- Functional magnetic resonance imaging (fMRI) utilizing the blood-oxygen-level dependent (BOLD) effect.
- Measurements were taken using a 1.5 T scanner with gradient-echo EPI technique.
- 12 healthy volunteers (20-68 years) were exposed to vanillin odor.
Main Results:
- Bilateral brain activation observed in the inferior frontal gyrus, anterior insular-periinsular area, hippocampus, amygdala, caudate nucleus, and cerebellum.
- Greater activation extent was noted in the right hemisphere and the right cerebellum.
Conclusions:
- The anterior insular-periinsular area and hippocampus are identified as secondary olfactory areas.
- Right inferior frontal gyrus activation may relate to odor naming efforts.
- Cerebellar activation is likely a consequence of extensive frontal lobe activation.