LSD increases the rate at which people learn from both rewards and punishments during a probabilistic reversal learning task, suggesting a state of heightened learning plasticity. Healthy volunteers given intravenous LSD or placebo completed a task where they had to learn which of three stimuli was most often rewarded, with the reward contingencies later reversing. Computational modeling of reinforcement learning showed that LSD primarily enhanced the reward learning rate and also elevated the punishment learning rate, while decreasing stimulus stickiness (a measure of choice repetition), indicating increased exploration. These effects point to a potential mechanism by which LSD could help revise maladaptive associations in clinical treatment.
Lysergic acid diethylamide (LSD) increases the speed at which the brain updates the value of actions following feedback, particularly after rewards, and makes behavior more exploratory. In a within-subjects experiment, healthy volunteers received intravenous LSD or placebo and performed a probabilistic reversal learning task where they learned which of three stimuli was most often rewarded, with contingencies later reversing. Computational modeling showed LSD enhanced the reward learning rate and also elevated the punishment learning rate, while reducing stimulus stickiness—a measure of choice repetition regardless of outcomes. Conventional measures of immediate feedback sensitivity were unaffected. These findings suggest LSD induces a state of heightened plasticity that may help revise maladaptive associations in clinical settings.
Internalizing problems like worrying, anxiety, and low mood are increasingly common in youth and may signal early-stage mental illness. This randomized controlled trial will test whether a mindfulness-based program called Learning to Offset Stress, added to usual care, reduces internalizing symptoms in 155 help-seeking youth aged 16–25. The program combines mindfulness exercises with mindful physical activity and yoga over eight weekly sessions. Assessments occur at baseline, end of treatment, and at two and six months after treatment. The primary outcome is the level of internalizing problems measured by the Adult Self Report questionnaire. Secondary outcomes include self-compassion, rumination, experiential avoidance, and well-being, along with brain imaging and cognitive tasks. The trial aims to clarify how early mindfulness intervention may alter symptom development and mental illness progression.