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The autonomic nervous system is a control system that acts largely unconsciously and regulates heart rate, digestion, respiratory rate, pupillary response, urination, and sexual arousal. This system is the primary mechanism in control of the fight-or-flight response and its role is mediated by two different components: the sympathetic nervous ...
Note: Attributing defensive behaviours purely to the limbic system is an oversimplification, as these are triggered by perceived threats, thus requiring an interplay of brain areas performing sensory integration, memory, and semantic knowledge with the limbic system to be elicited.
Arousal is the physiological and psychological state of being awoken or of sense organs stimulated to a point of perception. It involves activation of the ascending reticular activating system (ARAS) in the brain, which mediates wakefulness, the autonomic nervous system, and the endocrine system, leading to increased heart rate and blood pressure and a condition of sensory alertness, desire ...
The periaqueductal gray (PAG), also known as the central gray, is a brain region that plays a critical role in autonomic function, motivated behavior and behavioural responses to threatening stimuli. [ 1 ] [ 2 ] PAG is also the primary control center for descending pain modulation.
The model's main theory is that when confronted with a fear-inducing stimulus, humans tend to engage in two simultaneous ways of message processing: a perceived efficacy appraisal (cognitive processing) and a perceived threat appraisal (emotional processing). Differences in message appraisal then lead to two behavioural outcomes, with ...
Former President Donald Trump has made more than 100 public threats “to investigate, prosecute, imprison or otherwise punish his perceived opponents,” NPR reported Tuesday. Earlier this month ...
Fear is an unpleasant emotion that arises in response to perceived dangers or threats. Fear causes physiological and psychological changes. It may produce behavioral reactions such as mounting an aggressive response or fleeing the threat, commonly known as the fight-or-flight response. Extreme cases of fear can trigger an immobilized freeze ...
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