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Yohimbine-induced amygdala activation in pathological gamblers: a pilot study
Igor Elman1, Lino Becerra, Evelyne Tschibelu
1Bedford Veterans Administration Medical Center and Department of Psychiatry, Cambridge Health Alliance, Harvard Medical School, Somerville, Massachusetts, United States of America. ielman@cha.harvard.edu
Plos One
|February 10, 2012
Summary
Pathological gambling (PG) is linked to heightened brain responses to stress. This study found increased left amygdala activation in pathological gamblers after stress induction, suggesting brain sensitization.
Area of Science:
- Neuroscience
- Addiction Research
- Psychiatry
Background:
- Drug addiction is known to increase stress responses.
- Behavioral addictions, like pathological gambling (PG), may share similar stress reactivity.
- Understanding these responses is crucial for addiction treatment.
Purpose of the Study:
- To investigate if pathological gambling (PG) is associated with an enhanced physiological response to stress.
- To utilize functional magnetic resonance imaging (fMRI) to examine brain activity during stress induction in individuals with PG.
Main Methods:
- A pilot study involving four subjects with PG and five healthy controls.
- Stress was induced using yohimbine (an alpha-2 adrenoceptor antagonist).
- fMRI brain responses, subjective stress, and gambling urges were measured.
Main Results:
- Significant left amygdala activation was observed in all PG subjects following yohimbine administration.
- This amygdala response was absent in the control group.
- While yohimbine increased subjective stress in both groups, it did not induce gambling urges.
Conclusions:
- The findings support the hypothesis of brain sensitization to pharmacologically-induced stress in pathological gambling.
- This suggests a potential neural mechanism underlying stress-related aspects of PG.
- Further research is warranted to explore these sensitization effects in behavioral addictions.
