Scott Alexander examines the compatibility of enlightenment with sex scandals, using recent Buddhist teacher scandals as a starting point for broader questions about consciousness and social conditioning. Longer summary

Scott Alexander discusses the recent sex scandal involving Buddhist teacher Culadasa and explores its implications for the concept of enlightenment. He notes that many prominent Buddhist teachers, despite claims of enlightenment, have been involved in similar scandals. The post questions whether enlightenment is compatible with such behavior, and examines various theories about why these scandals occur. Scott suggests that meditation might 'dissolve social conditioning' without necessarily replacing it with compassion. He draws parallels to other consciousness-altering practices and wonders if there are advantages to our usual state of consciousness that these practices might disrupt. Shorter summary

Scott Alexander investigates the prevalence of Hallucinogen Persisting Perceptual Disorder (HPPD) and explores potential connections between perception, cognition, and belief in supernatural phenomena. Longer summary

Scott Alexander explores the prevalence and nature of Hallucinogen Persisting Perceptual Disorder (HPPD), a condition where people experience ongoing visual disturbances after using psychedelics. He discusses results from his own survey, which found that about 12.8% of psychedelic users reported some persisting hallucinations, with 3% still experiencing them. Most cases were mild, involving visual snow, halos, or patterns. Scott then critiques a study claiming HPPD doesn't exist, noting methodological issues. He also considers the possibility that some people naturally experience HPPD-like phenomena without drug use, and speculates on potential links between perception, cognition, and belief in supernatural phenomena. Shorter summary

Scott reviews a paper proposing that psychedelics work by relaxing priors in the brain, potentially treating mental illness but also risking side effects. Longer summary

This post reviews a paper by Friston and Carhart-Harris that uses predictive coding theory to explain the effects of psychedelic drugs. The authors argue that psychedelics 'relax' priors in the brain, allowing for new perspectives and potential therapeutic benefits. They suggest this mechanism could help treat most mental illnesses by allowing patients to break free from maladaptive priors. The post discusses the theory's implications, including potential downsides like HPPD and increased belief in pseudoscience. It also mentions connections to meditation and prior work by other researchers. Shorter summary

Scott Alexander explores Hallucinogen Persisting Perception Disorder (HPPD) and other conditions where drugs cause permanent effects, discussing potential mechanisms and their implications. Longer summary

Scott Alexander discusses Hallucinogen Persisting Perception Disorder (HPPD), a condition where some people experience permanent hallucinatory effects after using psychedelic drugs, particularly LSD. He explores the prevalence, potential mechanisms, and implications of this disorder. The post compares HPPD to other conditions with persistent effects like tardive dyskinesia, and examines various theories about how drugs could cause permanent changes in the brain. Scott considers two main hypotheses: the killing-off of specific neurons, and the idea of the brain as a chaotic system settling into new attractor states. He expresses a preference for the neuron death theory as it seems more understandable and less scary, but acknowledges the complexity and uncertainty surrounding these issues. Shorter summary