fMRI limitations and psychopathy treatability challenge mental health myths

A neuroscience discussion led by Abigail Marsh (Georgetown University) says fMRI brain scans have major limitations in diagnosing psychological disorders. Marsh notes that fMRI mainly reflects blood-flow changes, not direct neuronal activity, and it misses key neurotransmitter-system signals (e.g., dopamine and serotonin). This can reduce diagnostic accuracy and fuels misconceptions. The guest also argues that psychopathic traits are not fixed. Marsh says there is unwarranted pessimism about whether psychopathy can improve, claiming that if clinicians actually try treatment approaches, results can work. She further highlights how societal norms can push people with atypical cognitive profiles (including some autistic and highly intelligent individuals) to mask their traits to fit in. For psychotic tendencies—particularly in schizophrenia—Marsh describes “wiring” and “reality-check” challenges, along with difficulty pruning irrelevant thoughts and maintaining coherent reasoning. Finally, Marsh discusses extreme beliefs, explaining that people may sincerely feel they are “saving the world,” and she contrasts scientific terminology (“psychopath”) with more colloquial media terms (“sociopath”). She also adds that the US ranks high on measurable altruistic behavior. Keywords: fMRI, mental health diagnosis, psychopathy treatability