 It was also argued amygdala activity in response to racial stimuli represents increased threat perception rather than the traditional theory of the amygdala activity represented ingroup-outgroup processing.Racism has also been associated with lower childhood IQ in an analysis of 15,000 people in the UK.State racism – that is, the institutions and practices of a nation-state that are grounded in racist ideology – has played a major role in all instances of settler colonialism, from the United States to Australia.