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See also:ATTENTION (from See also:Lat. ad-tendo, await, expect; the See also:condition of being " stretched " or " tense ") , in See also:psychology, the concentration of consciousness upon a definite See also:object or See also:objects . The result is brought about, not by effecting any See also:change in the perceptions themselves, but simply by isolating them from other objects . Since all consciousness involves this See also:isolation, See also:attention may be defined generally as the necessary See also:condition of consciousness . Such a See also:definition, however, throws no See also:light upon the nature of the psychological See also:process, which is partly explained by the See also:general See also:law that the greater the number of objects on which attention is concentrated the less will each receive (" pluribus intentus, See also:minor est ad singula sensus "), and conversely . There are also See also:special circumstances which determine the amount of attention, e.g. influences not subject to the will, such as the vividness of the impression (e.g. in the See also:case of a See also:shock), strong change in pleasurable or painful sensations . Secondly, an exercise of volition is employed in fixing the mind upon a definite object . This is a purely voluntary See also:act, which can be strengthened by See also:habit and is variable in different individuals; to it the name " attention " is sometimes restricted . The distinction is ex-pressed by the words " reflex " or " passive," and " volitional " or " active." It is important to See also:notice that in every case of attention to an object, there must be in consciousness an implicit See also:apprehension of surrounding objects from which the particular object is isolated . These objects are known as the " psychic fringe," and are essential to the systematic unity of the attention-process . Attempts have been made to examine the attention-process from the physiological standpoint by investigating the See also:muscular and neural changes which accompany it, and even to assign to it a specific See also:local centre . It has, for example, been remarked that uniformity of environment, resulting in practically automatic activity, produces See also:mental See also:equilibrium and the See also:comparative disappearance of attention-processes; whereas the See also:necessity of adapting activity to abnormal conditions produces a comparatively high degree of attention . In other words, attention is absent where there is uniformity of activity in accordance with See also:uniform, or uniformly changing, environment . In spite of the progress made in this See also:branch of study, it has to be remembered that all psycho-See also:physical experiments are to some extent vitiated by the fact that the phenomena can scarcely remain normal under inspection . See G . F . Stout, See also:Analytic Psychology (See also:London, 1896), especially See also:part ii. See also:chap . 2; also PSYCHOLOGY, See also:BRAIN, &C . |
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