Emotional reactivity refers to how sensitive or responsive a person is to their emotions. It means that someone may react strongly or quickly to their feelings, whether positive or negative. Full definition
The loss of neuromodulation that is at the core of PTSD leads to intensification of emotional reactivity in general: traumatized people go immediately from stimulus to response without being able to make the intervening psychological assessment of the cause of their arousal, which causes them to overreact and intimidate others. (cirp.org)
It also suggests that increased dispositional mindfulness may act as a protective factor against the effects of negative emotional reactivity by neuroticism. (trialsjournal.biomedcentral.com)
In addition to their ability to maintain sensitivity to unexpected events against a background of expected stressors, Novel rats also exhibit reduced emotional reactivity measured in the open field (11, 22), enhanced HPA negative feedback control as indicated by a greater CORT suppression of hippocampal field potentials (23), and a reduced basal CORT concentration (13). (pnas.org)