=Nature of Involuntary Attention.=--Attention is met in its simplest form when the mind spontaneously focuses itself upon any strong stimulus received through the senses, as a flashing light, a loud crash, a bitter taste, or a violent pressure. As already noted, the significance of this type of attention lies in the fact that the mind seeks to adjust itself intelligently to a new condition in its surroundings which has been suggested to it through the violent stimulus. The ability to attend to such stimuli is evidently an inherited capacity, and is possessed by animals as well as by children. It is also the only form of attention exercised by very young children, and for some time the child seems to have little choice but to attend to the ever varying stimuli, the attention being drawn now to a bright light, now to a loud voice, according to the violence of the impressions. On account of the apparent lack of control over the direction of attention, this type is spoken of as spontaneous, or involuntary, attention. =Place and Value.=--It is only, however, during his very early years that man lacks a reasonable control even over relatively strong stimulations. As noted above, the mind acquires an ability to concentrate itself upon a single problem in the midst of relatively violent stimulations. Moreover, in the midst of various strong stimulations, it is able to select the one which it desires, to the exclusion of all others. At a relatively early age, for instance, the youth is able, in his games, to focus his attention upon the ball, and pays little attention to the shouts and movements of the spectators. On the other hand, however, it is also true that man never loses this characteristic of attending in an involuntary, or reflex, way to any strong stimulus. Indeed, without the possession of this hereditary tendency, it is hard to see how he could escape any dangers with which his body might be threatened while his attention is strongly engaged an another problem.