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The fight-or-flight or the fight-flight-freeze-or-fawn [1] (also called hyperarousal or the acute stress response) is a physiological reaction that occurs in response to a perceived harmful event, attack, or threat to survival. [2] It was first described by Walter Bradford Cannon in 1915.
In most instances, the individual is lifting one or two wheels of the car from the back. Therefore, they are only actually lifting a small fraction of the vehicle's weight. While the fight or flight response allows for increased lifting capacity, it would be hundreds of pounds rather than thousands. [40] [41]
In evolutionary psychology, people often speak of the four Fs which are said to be the four basic and most primal drives (motivations or instincts) that animals (including humans) are evolutionarily adapted to have, follow, and achieve: fighting, fleeing, feeding and fucking (a more polite synonym is the word "mating"). [1]
If the amygdala perceives a match to the stimulus, i.e., if the record of experiences in the hippocampus tells the amygdala that it is a fight, flight or freeze situation, then the amygdala triggers the HPA (hypothalamic–pituitary–adrenal) axis and "hijacks" or overtakes rational brain function. [5]
It plays an essential role in the fight-or-flight response by increasing blood flow to muscles, heart output by acting on the SA node, [15] pupil dilation response, and blood sugar level. [16] [17] It does this by binding to alpha and beta receptors. [17] It is found in many animals, including humans, and some single-celled organisms.
Polyvagal theory calls this the "smart vagus" because it associates it with the regulation of sympathetic "fight or flight" behaviors by way of social affiliative behaviors. [24] These behaviors are said to include social communication and self-soothing and calming. [17]
Cohan says feeling anxious or scared activates your body’s fight-or-flight response, triggering the release of hormones like adrenaline. The stress hormones can narrow blood vessels, sending ...
The neurocircuit for how rats perceive alarm pheromones was shown to be related to the hypothalamus, brainstem, and amygdalae, all of which are evolutionary ancient structures deep inside or in the case of the brainstem underneath the brain away from the cortex, and involved in the fight-or-flight response, as is the case in humans. [79]