ascending reticular activating system

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The ascending fibres of the reticular formation in the brainstem, defined functionally rather than anatomically according to their control of the level of physiological arousal or activation of the cerebral cortex, essential for wakefulness, attention, and concentration. Also called the reticular activating system (RAS). See also cerveau isolé. Compare descending reticular formation. ARAS abbrev.

Subjects: Psychology.

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