Over-activation of primate subgenual cingulate cortex enhances the cardiovascular, behavioral and neural responses to threat.

ABSTRACT: Stress-related disorders such as depression and anxiety are characterized by enhanced negative emotion and physiological dysfunction. Whilst elevated activity within area 25 of the subgenual anterior cingulate cortex (sgACC/25) has been implicated in these illnesses, it is unknown whether this over-activity is causal. By combining targeted intracerebral microinfusions with cardiovascular and behavioral monitoring in marmosets, we show that over-activation of sgACC/25 reduces vagal tone and heart rate variability, alters cortisol dynamics during stress and heightens reactivity to proximal and distal threat. ¹⁸F-FDG PET imaging shows these changes are accompanied by altered activity within a network of brain regions including the amygdala, hypothalamus and dorsolateral prefrontal

SUBMITTER: Alexander L 

PROVIDER: S-EPMC7588412 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature