testosterone studies

• • Albert et al (1989) found that injecting female rats with testosterone made them behave more aggressively.
• • Van Goozen et al (1995) found that administering testosterone to female-to-male transgender people resulted in more aggressive behaviour. Conversely, male-to-female transgender people given drugs to lower their testosterone levels behaved less aggressively.
• • Dabbs et al (1995) studied testosterone levels of prisoners. Offenders who had committed violent crimes had higher testosterone levels and were more likely to be involved in fights than those who were convicted of non-violent crimes.
• edwards 1968- giving the hormone testosterone to newborn female mice made them act like males with increased aggression when given testosterone as adults- however, control females given testosterone as adults did not react this way, suggesting testosterone masculinizes androgen-sensitive neural circuits underlying aggression in the brain.
• Van Goozen 1997- conducted a natural experiment on transgender sex-change patients, this is one of the few cases where research was actually carried out on humans- findings- testosterone governed aggression, males receiving testosterone suppressants became less aggressive. Females receiving testosterone became more aggressive.