Dr Robin Carhart-Harris - Using FMRI to Investigate the Effects of Psilocybin on Brain Function

Psilocybin and its impact on the brain are explored through fMRI scanning techniques to visualize changes in neural activity. Research findings indicate that psilocybin does not simply hyper-activate regions but instead induces profound and widespread decreases in cerebral blood flow, particularly in key brain areas such as the posterior cingulate cortex, which plays a major role in self-consciousness and internal reflection. Functional connectivity between these brain regions is also diminished, suggesting a breakdown of the integration and constraints that typically hold the sense of self together. These observations map to potential clinical applications for treating depression, as the default mode network shows differing connectivity patterns in depressed patients compared to controls.