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Reward circuitry activation by noxious thermal stimuli
L Becerra1, H C Breiter, R Wise
1Center for Functional Pain Neuroimaging and Therapy Research, Boston, MA 02129, USA.
Neuron
|December 12, 2001
Summary
Noxious heat activates brain regions associated with both pain and reward. This suggests a shared neural system for processing aversive and rewarding stimuli, revealed by functional magnetic resonance imaging (fMRI).
Area of Science:
- Neuroscience
- Pain Research
- Reward System Studies
Background:
- The neural basis for processing both pain and reward is not fully understood.
- Investigating shared circuitry could offer new insights into affective processing.
Purpose of the Study:
- To investigate the neural overlap between pain and reward processing using functional magnetic resonance imaging (fMRI).
- To examine the temporal dynamics of brain activation in response to noxious thermal stimuli.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was employed to monitor brain activity.
- Noxious thermal stimuli (46°C) were applied to participants.
- Signal changes in brain regions associated with pain and reward were analyzed.
Main Results:
- Noxious heat elicited significant signal changes in both pain and reward circuitry.
- Early activation was observed in reward-related areas like the sublenticular extended amygdala (SLEA) and ventral tegmentum/periaqueductal gray (VT/PAG).
- Delayed activation was noted in somatosensory regions, including the SI somatosensory cortex, thalamus, and insula.
Conclusions:
- The findings support a shared neural system for evaluating aversive and rewarding stimuli.
- Distinct temporal patterns of activation suggest differential processing roles within this shared system.