Hormones

Chemical messengers that travel through the bloodstream and spark physcial reaction

endocrine system in which glands send signals to the brain which releases hormones that travel through the blood to produce physicaool reactions

Testerone (procuded in the testies and ovaries) but higher in male and it has a correlation with aggression

Amygdala and Prefrontal cortext

processing emotions and plays a role in the fight or flight response

Thinking and descion making, and emotional regulation

Radke et al (2015)

to investigate the relationships between perceiving a social threat, testosterone and the amygdala

Lab study
54 female particepents
Half got a dose of testerone, other half got a placebo
they were all placed in a fMRI to measure activation in amygdala and prefrontal cortices
shown pictures of faces: angry or happy
For each face researchers told partipents to approach (make image bigger) or avoid (make image smaller) using a joystick
The motivation factor was the following of the researcher's instructions (avoid or approach)

Testerone group had greater activation of amygdala when "approaching" angry faces than when they approached happy faces
There was not a significant difference in the activation of the prefrontal cortex across groups

Higher levels of testosterone increase function of the amydala and activate fight response (confront social threat)
Testosterone levels play an important function in increasing the activation of the amygdala which will result in more emotional and physical readiness to react aggressively.
Thus testerone may have a role in preparing for confrontation which may lead to indivuals to react aggressively
thus it shows how the hormone: testerone can effect the behaviour: agression