Psychedelic studies often rely on subjective surveys or fMRI scans because direct biochemical changes are difficult to measure.

“So, like you look at these studies on psychedelics, they're predominantly like fMRI or, you know, either they're either like let's give them a survey and ask them questions about how they feel or they're like super expensive complicated fMRI studies where they're looking at like glucose uptake in certain brain regions because the brain is inherently hard to measure.”