Numerous brain regions, particularly those associated with reward and motivation, are activated by the thought or presence of a romantic partner. These include the hippocampus, hypothalamus, and anterior cingulated cortex. Activation of these areas may serve to inhibit defensive behaviour, reduce anxiety and increase trust in the romantic partner. In addition, areas such as the amygdala and frontal cortex are deactivated in response to romantic love; a process which may function to reduce the likelihood of negative emotions or judgement of the partner.
