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Ascending reticular activating system. Reticular formation labeled near center. The ascending reticular activating system (ARAS), also known as the extrathalamic control modulatory system or simply the reticular activating system (RAS), is a set of connected nuclei in the brains of vertebrates that is responsible for regulating wakefulness and ...
Ascending reticular activating system. The ascending reticular activating system consists of a set of neural subsystems that project from various thalamic nuclei and a number of dopaminergic, noradrenergic, serotonergic, histaminergic, cholinergic, and glutamatergic brain nuclei.
Donald Benjamin Lindsley (December 23, 1907 – June 19, 2003) was a physiological psychologist most known as a pioneer in the field of brain function study. Considered by his colleagues to have been worthy of winning the Nobel Prize in Physiology for discovering the reticular activating system along with Horace Winchell (Tid) Magoun and Giuseppe Moruzzi, Lindsley was instrumental in ...
According to Eysenck, differences in extraversion are a result of differences in sensitivity of the ascending reticular activating system. People with less sensitive systems are not easily aroused and seek additional stimulation, resulting in an extraverted personality. [10]
Eysenck linked Extraversion to activation of the ascending reticular activating system, an area of the brain which regulates sleep and arousal transitions. [1] Eysenck's two original personality factors, Neuroticism and Extraversion , were derived from the same lexical paradigm used by other researchers (e.g., Gordon Allport , [9] Raymond ...
It is a part of the reticular activating system. The locus coeruleus, which in Latin means "blue spot", is the principal site for brain synthesis of norepinephrine (noradrenaline). The locus coeruleus and the areas of the body affected by the norepinephrine it produces are described collectively as the locus coeruleus-noradrenergic system or LC ...
One such example is the heterogeneous collection of more than two dozen nuclei on each side of the upper brainstem (pons, midbrain and in the posterior hypothalamus), collectively referred to as the reticular activating system (RAS). Their axons project widely throughout the brain.
The activation-synthesis hypothesis, proposed by Harvard University psychiatrists John Allan Hobson and Robert McCarley, is a neurobiological theory of dreams first published in the American Journal of Psychiatry in December 1977. The differences in neuronal activity of the brainstem during waking and REM sleep were observed, and the hypothesis ...