A lasting impact of serotonergic psychedelics on visual processing and behavior
OpenAlex – July 06, 2024
Source: OpenAlex
Summary
Psilocybin and other Serotonergic psychedelics can yield therapeutic effects lasting weeks, profoundly shifting perception. This Neuroscience and Psychology research, part of Psychedelics and Drug Studies, reveals how these Hallucinogens alter the Sensory system. People using 5-HT2A-agonist psychedelics showed slowed responses to a visual Stimulus and increased visual cortex involvement. Mice exhibited altered visual cortex activity, indicating a shift from top-down to bottom-up processing. This Neurotransmitter Receptor Influence on Behavior, explored via Biochemical Analysis and Sensing Techniques, persists.
Abstract
Abstract Serotonergic psychedelics (e.g., psilocybin) have shown potential for treating psychiatric disorders, with therapeutic effects lasting weeks after a single dose. Predictive processing theories posit that psychedelics work by loosening priors or high-level beliefs, including ingrained biases that have become pathological, leading to shifts in bottom-up vs top-down information processing that reconfigure perception, cognition, and mood. Because 5-HT2A receptors, the primary target of psychedelics, are enriched in visual cortices, we investigated whether psychedelics alter visual processing in a manner consistent with predictive processing theories. People who recently (<3 weeks) used 5-HT2A-agonist psychedelics (psilocybin, LSD) exhibited slowed response latencies and increased cortical involvement in generating saccades to targets in predictable locations, along with a generalization of sensory prediction errors (i.e., deviance detection) during passive visual processing. Individuals who recently used a 5-HT1A- selective psychedelic (5-MeO-DMT) displayed similar changes in saccade production, but unaltered deviance detection, suggesting circuit-specific effects. Mice administered DOI (5- HT2A-agonist) exhibited altered deviance detection within primary visual cortex (V1), along with weakened top-down feedback to V1 from higher cortical area ACa. These results concord with the hypothesis that psychedelics shift the balance from top-down to bottom-up in sensory cortical circuits – an effect that persists beyond the acute exposure period.