Excerpt: ...be exerted in two ways; first, by the organs of sense to the objects of perception; and, secondly, by the mind to the subjects of its recollection; and this latter exercise of attention, as will be hereafter explained, seems to be in a very great degree peculiar to man, and to be nearly wanting in animals. According to the nature and constitution of the human mind, the effective duration of the attention seems to be very limited: if the eye be steadily directed to any particular object, after a few seconds, it ...
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Excerpt: ...be exerted in two ways; first, by the organs of sense to the objects of perception; and, secondly, by the mind to the subjects of its recollection; and this latter exercise of attention, as will be hereafter explained, seems to be in a very great degree peculiar to man, and to be nearly wanting in animals. According to the nature and constitution of the human mind, the effective duration of the attention seems to be very limited: if the eye be steadily directed to any particular object, after a few seconds, it will be found to wander; and if the mind be exerted on the subjects of its recollection, there is very soon perceived an interruption, from the intrusion of irrelevant thoughts. Pg 94 The effective duration of the attention will much depend on the superior capacity, nature, or constitution of the intellect itself; but still more on the manner in which these habits of attention are exercised; for, by proper cultivation, its duration may be considerably protracted. As a proof of the limited endurance of the faculty of attention in ordinary minds, allow the following experiment to be made. Let two ordinary persons, A. and B., take a map of a district with which they are unacquainted, and let each be allowed half an hour to study the map. Desire A. to fix his attention undeviatingly to the map for this time; and at its expiration, the map being withdrawn, request him to put on paper the relative Pg 95 situations and names of the different places; and for the performance of his task, allow him another half hour. As the experiment has been repeatedly made, it may be confidently predicted, that A. would exhibit a very incorrect copy of the original map. Let B. take the same map to study for the same time; but instead of keeping his eyes undeviatingly fixed to the object, desire him to view it only for a few seconds; and then, shutting his eyes, let him endeavour to bring the picture of the map before his mind: his first efforts will convey a very...
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