Single 1 mg/kg Psilocybin Dose Curbs Rats' Reward Seeking After 48 Hours
Updated
Updated · PsyPost · Jul 3
Single 1 mg/kg Psilocybin Dose Curbs Rats' Reward Seeking After 48 Hours
1 articles · Updated · PsyPost · Jul 3
Summary
Forty-eight hours after a single 1 mg/kg psilocybin injection, rats chose large delayed rewards less often and took longer to pursue them, pointing to reduced reward-seeking rather than a short-lived drug effect.
At 24 hours, psilocybin-treated rats looked similar to controls, and their forced-choice accuracy stayed intact at 48 hours, suggesting the shift was not driven by impaired attention, movement or greater impulsivity.
Brain analysis then found more active parvalbumin inhibitory neurons wrapped in perineuronal nets in deep prefrontal cortex layers, and rats with the most of these active cells showed the weakest preference for large rewards.
The findings offer a possible mechanism for psilocybin's reported anti-addiction effects by showing how it may damp reward-cue processing, though the study was limited to 14 male rats and tracked effects only for 48 hours.
If one dose can rewire our brain's reward system, what does this reveal about the fundamental nature of addiction?
If psilocybin reduces reward-seeking, could it also dampen a person's healthy ambitions and life goals?
Why has psilocybin research largely ignored its profoundly different effects on the female brain until now?
Delayed Effects of Psilocybin on Reward-Seeking and Addiction: From Rat Models to Human Therapy
Overview
Recent research reveals that psilocybin can reduce heroin-seeking behavior in rats, but this effect is delayed and only appears during forced abstinence, not during active drug use. The findings highlight that psilocybin’s impact on addiction is highly dependent on the behavioral context, showing greater promise for preventing relapse or reducing cravings when individuals are in withdrawal. This suggests that psilocybin may be more effective as a tool for supporting recovery rather than stopping ongoing drug use, opening new possibilities for addiction treatment strategies that focus on relapse prevention.