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A long-term ecstasy-related change in visual perception
John Brown1, Mark Edwards, Elinor McKone
1School of Psychology, The Australian National University, Canberra, Australia. john.brown@anu.edu.au
Psychopharmacology
|April 26, 2007
Summary
Long-term ecstasy (methylenedioxymethamphetamine) use may alter visual perception, specifically the tilt aftereffect illusion. Abstinent users showed increased illusion magnitude, suggesting lasting effects on the occipital lobe's serotonin system.
Area of Science:
- Neuroscience
- Psychology
- Vision Science
Background:
- Methylenedioxymethamphetamine (ecstasy) is known to impact the serotonin system.
- Serotonin plays a role in visual processing within the occipital lobe.
- Disruptions to serotonin may affect lateral inhibition and visual illusions like the tilt aftereffect.
Purpose of the Study:
- To investigate long-term effects of ecstasy use on visual functioning.
- To determine if ecstasy users exhibit altered tilt aftereffect illusion magnitudes.
- To assess behavioral changes related to serotonergic functions in the occipital lobe.
Main Methods:
- Compared 30 ecstasy users with 34 non-drug controls.
- Measured the magnitude of the tilt aftereffect illusion.
- Used adaptation stimuli at 15 and 40 degrees from vertical.
Main Results:
- Ecstasy users abstinent for ≥115 days showed a larger tilt aftereffect after 40-degree adaptation compared to controls.
- No significant differences were found after 15-degree adaptation.
- No differences were observed between controls and ecstasy users with recent amphetamine use (within 61 days).
Conclusions:
- Findings support the hypothesis that ecstasy-induced serotonin system damage leads to behavioral changes in visual perception.
- The tilt aftereffect may serve as a sensitive measure of long-term serotonergic changes in the occipital lobe.
- Long-term abstinence is associated with altered visual processing in ecstasy users.
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