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Central stress response among deprived and continuing marijuana users and nonusers
Gaylen E Fronk1, Kathryn Hefner2, Rebecca Gloria3
1Department of Psychology.
Summary
This study found that neither a history of heavy marijuana use nor acute deprivation significantly altered central nervous system stress responses. Findings suggest marijuana use does not impact stress reactivity in the central nervous system.
Area of Science:
- Neuroscience
- Psychology
- Addiction Research
Background:
- Heavy marijuana use is prevalent, yet its effects on central nervous system (CNS) stress responses remain incompletely understood.
- Previous research suggests drug use can alter stress reactivity, but specific findings for marijuana are mixed.
- Understanding how marijuana use and deprivation influence CNS stress responses is crucial for public health and clinical interventions.
Purpose of the Study:
- To investigate the impact of heavy marijuana use and acute marijuana deprivation on central nervous system (CNS) stress responses.
- To examine whether stressor predictability moderates the relationship between marijuana use/deprivation and CNS stress responses.
- To compare CNS stress responses between heavy marijuana users and nonusers, and between deprived and continuing heavy users.
Main Methods:
- A total of 210 participants (134 heavy marijuana users, 76 nonusers) were recruited.
- Heavy users were randomized into a 3-day marijuana deprivation group or a continuing use group.
- Participants underwent threat-of-shock tasks with varying predictability to measure central stress responses via startle potentiation.
Main Results:
- Neither marijuana deprivation nor heavy marijuana use significantly altered overall startle potentiation.
- Stressor predictability did not significantly moderate the effects of deprivation or heavy use on startle potentiation.
- Posthoc analyses revealed some mixed evidence for an interaction between general startle reactivity and deprivation.
Conclusions:
- A history of marijuana use or acute deprivation did not alter central stress responses, contrary to theoretical expectations.
- This study contributes to the understanding of CNS stress responses in individuals with a history of drug use.
- Future research should explore individual differences and specific stressor characteristics that may moderate these effects.
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