Limitation of serotonin studies

• Studies linking serotonin with aggression have limitations
• Animal studies show a link between low serotonin and aggression but there could be other factors
• Studies using diets are better controlled and have more healthy participants. Don't directly link serotonin to aggression
• Lab studies lack ecological validity
• Studies from animals not generalisable to humans
• Virkkunen et al found serotonin was significantly lower in arsonists than healthy people, serotonin turnover didn't correlate with severity of offences