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Aversive gustatory stimulation activates limbic circuits in humans
D H Zald1, J T Lee, K W Fluegel
1Cognitive Neuroimaging Unit, Minneapolis Veterans Affairs Medical Center, MN 55417, USA.
Brain : a Journal of Neurology
|July 2, 1998
Summary
The human amygdala and orbitofrontal cortex process unpleasant tastes, similar to unpleasant smells. This study highlights the brain
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Psychology
Background:
- Animal models suggest the amygdala is crucial for recognizing aversive stimuli.
- Previous PET studies show amygdala and orbitofrontal cortex activation during exposure to aversive odors.
Purpose of the Study:
- To investigate if aversive gustatory stimuli activate the same brain regions as aversive olfactory stimuli.
- To explore the neural correlates of taste-based emotion processing.
Main Methods:
- Positron Emission Tomography (PET) was used to measure regional cerebral blood flow (rCBF).
- Nine healthy women participated, tasting an aversive saline solution, pure water, and chocolate.
- fMRI data analysis focused on comparing brain activity across different taste conditions.
Main Results:
- Aversive saline, compared to water, significantly increased rCBF in the right amygdala, left orbitofrontal cortex, medial thalamus, anterior cingulate cortex, and right hippocampus.
- The right amygdala, left orbitofrontal cortex, and pregenual cingulate remained activated when comparing saline to chocolate.
- These findings suggest modality-independent processing of aversive stimuli in these brain regions.
Conclusions:
- The amygdala and orbitofrontal cortex are involved in processing aversive stimuli across both gustatory and olfactory modalities.
- The pregenual cingulate cortex plays a significant role in negative emotional processing.
- This research provides insights into the neural basis of taste aversion and emotional responses.