Researchers claim to have first direct evidence serotonin release is reduced in depression
![patient having a PET scan](data:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%20100%2056%22%3E%3C/svg%3E)
After patients received d-amphetamine, which stimulates serotonin release, researchers found that those with major depressive disorder or depression linked to Parkinson's disease released significantly less serotonin than non-depressed patients.…