Purpose of review Psychedelics
are reawakening interest from psychiatry, cognitive neuroscience and the general public with impressive outcomes in small-scale clinical trials, intriguing human brain imaging work and high-impact journalism.
This brief opinion piece offers a perspective on how psychedelics
work in the brain that may help contextualize these developments. It attempts to link various scales of action, from the molecular (serotonin
2A receptor agonism) through to the anatomical and functional (heightened plasticity) and up to the dynamic (increased brain entropy), systems level (network disintegration and desegregation) and experiential.
It is proposed that psychedelics
initiate a cascade of neurobiological changes that manifest at multiple scales and ultimately culminate in the relaxation of high-level beliefs. The purpose of psychedelic
therapy is to harness the opportunity afforded by this belief-relaxation to achieve a healthy revision of pathological beliefs.