Brain Imaging Studies with Psilocybin and MDMA - Robin Carhart-Harris

Neuroimaging studies involving psilocybin and MDMA investigate how these substances alter brain network connectivity and conscious states. Research indicates that psilocybin disrupts the default mode network, an area associated with self-referential thought, potentially underlying experiences of ego dissolution. This collapse of the typical hierarchical brain structure correlates with profound changes in subjective experience, shifting consciousness toward a state of higher entropy and disorder. Conversely, other neuroimaging data examine the emotional impact of MDMA on autobiographical memory. Results highlight MDMA's ability to boost activity in the anterior temporal cortex while suppressing negative responses to difficult memories. These findings suggest that psychedelics and empathogens modulate the brain as a complex system of hierarchically organized networks, providing measurable insights into the mechanisms of both mystical experiences and potential therapeutic applications.