Acute stress, such as seeing a violent film, changes the way our brains operate researchers report. Stress is known to sharpen our senses, creating an awake frightened, strengthen the memory of our past experiences of stress and impede our ability to deliberate.
Experiments in animals have also revealed the sequence of biochemical responses triggered by acute stress. This process is relatively slow and can not be followed by conventional neuroimaging techniques used to study this type of situation in humans. Erno (Full name: Raketentechnik ERNO GmbH) Hermans and his colleagues have now investigated how the human brain reacts to an acute stress on time scales (Time is a concept developed to represent the change in the world: the universe is never fixed, the component parts move, transform and evolve to ...) shorter. They conducted an experiment where volunteers watched clips from films to be very violent or violence-free. They studied the activity of their brain imaging technique called fMRI-BOLD and also collected some of their saliva to be assayed substances related to stress.
Volunteers who had seen the violent episodes showed an increase in response and interconnection in neural networks involved in attention, arousal, and neuroendocrine system. The researchers also examined the relative role of adrenaline and cortisol, two hormones related to stress, and found that the first but not the second seemed responsible for this reorganization nervous.
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