/kon"sheuhs nis/, n.1. the state of being conscious; awareness of one's own existence, sensations, thoughts, surroundings, etc.2. the thoughts and feelings, collectively, of an individual or of an aggregate of people: the moral consciousness of a nation.3. full activity of the mind and senses, as in waking life: to regain consciousness after fainting.4. awareness of something for what it is; internal knowledge: consciousness of wrongdoing.5. concern, interest, or acute awareness: class consciousness.6. the mental activity of which a person is aware as contrasted with unconscious mental processes.7. Philos. the mind or the mental faculties as characterized by thought, feelings, and volition.8. raise one's consciousness, to increase one's awareness and understanding of one's own needs, behavior, attitudes, etc., esp. as a member of a particular social or political group.[1625-35; CONSCIOUS + -NESS]
* * *Quality or state of being aware.As applied to the lower animals, consciousness refers to the capacity for sensation and, usually, simple volition. In higher animals, this capacity may also include thinking and emotion. In human beings, consciousness is understood to include "meta-awareness," an awareness that one is aware. The term also refers broadly to the upper level of mental life of which the person is aware, as contrasted with unconscious processes. Levels of consciousness (e.g., attention vs. sleep) are correlated with patterns of electrical activity in the brain (brain waves). See also philosophy of mind.
* * *Introductiona psychological condition defined by the English philosopher John Locke (Locke, John) as “the perception of what passes in a man's own mind.”Early views.In the early 19th century the concept was variously considered. Some philosophers regarded it as a kind of substance, or “mental stuff,” quite different from the material substance of the physical world. Others thought of it as an attribute characterized by sensation and voluntary movement, which separated animals and men from lower forms of life and also described the difference between the normal waking state of animals and men and their condition when asleep, in a coma, or under anesthesia (the latter condition was described as unconsciousness). Other descriptions included an analysis of consciousness as a form of relationship or act of the mind toward objects in nature, and a view that consciousness was a continuous field or stream of essentially mental “sense data,” roughly similar to the “ideas” of earlier empirical philosophers.The method employed by most early writers in observing consciousness was introspection—looking within one's own mind to discover the laws of its operation. The limitations of the method became apparent when it was found that because of differing preconceptions, trained observers in the laboratory often could not agree on fundamental observations.The behaviourist view.The failure of introspection to reveal consistent laws led to the rejection of all mental states as proper subjects of scientific study. In behaviourist psychology, derived primarily from work of the American psychologist John B. Watson in the early 1900s, the concept of consciousness was irrelevant to the objective investigation of human behaviour and was doctrinally ignored in research. Neobehaviourists, however, adopted a more liberal posture toward mentalistic states such as consciousness.Neurophysiological mechanisms.That consciousness depends on the function of the brain has been known from ancient times. Although detailed understanding of the neural mechanisms of consciousness has not been achieved, correlations between states of consciousness and functions of the brain are possible. Levels of consciousness in terms of levels of alertness or responsiveness are correlated with patterns of electrical activity of the brain (brain waves) recorded by an electroencephalograph. During wide-awake consciousness the pattern of brain waves consists of rapid irregular waves of low amplitude or voltage. In contrast, during sleep, when consciousness can be said to be minimal, the brain waves are much slower and of greater amplitude, often coming in periodic bursts of slow waxing and waning amplitude.Both behavioral levels of consciousness and the correlated patterns of electrical activity are related to the function of a part of the brainstem called the reticular formation. Electrical stimulation of the ascending reticular systems arouses a sleeping cat to alert consciousness and simultaneously activates its brain waves to the waking pattern.It was once supposed that the neurophysiological mechanisms subserving consciousness and the higher mental processes must reside in the cortex. It is more likely, however, that the cortex serves the more specialized functions of integrating patterns of sensory experience and organizing motor patterns and that the ascending reticular system represents the neural structures most critically related to consciousness. The brainstem reticular formation should not, however, be called the seat of consciousness. It represents an integrative focus, functioning through its widespread interconnections with the cortex and other regions of the brain. See also introspection; unconscious.
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