Left: Your brain on placebo. Right: Your brain on psilocybin (mushrooms) - eviltoast

Explanation: You are looking at communication pathways between different regions of the brain (“cliques”).

On the left, people were given a placebo. Their brain cliques mostly communicated within themselves. On the right, people were given psilocybin, the psychoactive ingredient in magic mushrooms. We see their brain cliques start communicating across the board, making connections like those not seen with a placebo.

This likely explains the presence of synesthesia that can be experienced during psychedelic “trips.”

Source study

TED Talk on the topic