https://jeb.biologists.org/content/jexbio/223/3/jeb216499.full.pdf

https://video.search.yahoo.com/yhs/search?fr=yhs-sz-001&hsimp=yhs-001&hspart=sz&p=astrilda+astrild#id=6&vid=26e5ffd5aa36afce79302890c29cd0c9&action=click


Here dopamine effect on personality is studied with the positive findings so clear that the authors comment that candidate gene studies only hint at what the real effects are.