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Unconsciousness may occur as the result of traumatic brain injury, brain hypoxia (inadequate oxygen, possibly due to a brain infarction or cardiac arrest), severe intoxication with drugs that depress the activity of the central nervous system (e.g., alcohol and other hypnotic or sedative drugs), severe fatigue, pain, anaesthesia, and other causes.
Twenty percent of comatose states result from an ischemic stroke, brain hemorrhage, or brain tumor. [14] During a stroke, blood flow to part of the brain is restricted or blocked. An ischemic stroke, brain hemorrhage, or brain tumor may cause restriction of blood flow. Lack of blood to cells in the brain prevents oxygen from getting to the ...
In psychoanalysis and other psychological theories, the unconscious mind (or the unconscious) is the part of the psyche that is not available to introspection. [1] Although these processes exist beneath the surface of conscious awareness, they are thought to exert an effect on conscious thought processes and behavior. [ 2 ]
A reflex from hearing a sudden loud noise will happen in the primary acoustic startle reflex pathway consisting of three main central synapses, or signals that travel through the brain. First, there is a synapse from the auditory nerve fibers in the ear to the cochlear root neurons (CRN).
The protoself is an unconscious process that creates a "map" of the body's physiological state, which is then used by the brain to generate conscious experience. This "map" is constantly updated as the brain receives new stimuli from the body, and it forms the foundation for the development of more complex forms of consciousness.
Unconscious cognition is the processing of perception, memory, learning, thought, and language without being aware of it. [1]The role of the unconscious mind on decision making is a topic greatly debated by neuroscientists, linguists, philosophers, and psychologists around the world.
Via a series of experiments and brain scans, the team at NYU has discovered for the first time that the human mind expends a whole lot more energy interpreting information presented as fact.
Drug-induced comas are used to protect the brain during major neurosurgery, as a last line of treatment in certain cases of status epilepticus that have not responded to other treatments, [2] and in refractory intracranial hypertension following traumatic brain injury. [1] Induced coma usually results in significant systemic adverse effects.