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In the 1960s, Dr. MacLean enlarged his theory to address the human brain's overall structure and divided its evolution into three parts, an idea that he termed the triune brain. In addition to identifying the limbic system, he hypothesized a supposedly more primitive brain called the R-complex, related to reptiles, which controls basic ...
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.
The rats showed much decreased exploration and social interaction when tested in different contexts compared to control rats. [3] To further make a correlation to the biochemistry (as mentioned below), chronic infusion of propranolol (beta-adrenergic receptor antagonist) prevented the behavioral changes following repeated stressor exposure thus ...
Fear causes the organism to seek safety and may cause a release of adrenaline, [4] [5] which has the effect of increased strength and heightened senses such as hearing, smell, and sight. Self-preservation may also be interpreted figuratively, in regard to the coping mechanisms one needs to prevent emotional trauma from distorting the mind (see ...
Instinct is the inherent inclination of a living organism towards a particular complex behaviour, containing innate (inborn) elements.The simplest example of an instinctive behaviour is a fixed action pattern (FAP), in which a very short to medium length sequence of actions, without variation, are carried out in response to a corresponding clearly defined stimulus.
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It is found across many different species, throughout all stages of life. A variety of responses may occur depending on the affected individual's emotional state, [2] body posture, [3] preparation for execution of a motor task, [4] or other activities. [5] The startle response is implicated in the formation of specific phobias. [citation needed]
A company called Tomorrow Biostasis is focusing on human cryopreservation in the hopes it can eventually reverse death. The new Berlin startup has already preserved the bodies of about 10 deceased ...