This Connect is about how the brain reacts to stress. For additional research on the ‘amydala hijack’ take a look here: https://www.healthline.com/health/stress/amygdala-hijack
For a deeper understanding of the sort of threats that may be perceived but the brain, check out the work of David Rock: https://www.mindtools.com/akswgc0/david-rocks-scarf-model