I. _Involuntary Attention._ This mental state is the elementary phase of attention. Attention is not a faculty of the mind, but is instead the focusing of the consciousness upon one object to the temporary exclusion of all other objects. It is a turning of the mind on an object. The object of attention may be either external, such as a person or thing; or internal, such as a feeling, thought, memory, or idea. Attention may be either voluntary, that is, directed consciously by the will; or involuntary, that is, directed unconsciously and instinctively and apparently independently of the will. Voluntary attention is an acquired and developed power and is the attribute of the thinker, student and intellectual individual in all walks of life. Involuntary attention, on the contrary, is but little more than a reflex action, or a nervous response to some stimulus. As Halleck says: "Many persons scarcely get beyond the reflex stage. Any chance stimulus will take their attention away from their studies or their business." Sir William Hamilton made a still finer distinction, which is, however, generally overlooked by writers on the subject, but which is scientifically correct and which we shall follow in this book. He holds that there are three degrees or kinds of attention: (1) the reflex or involuntary, which is instinctive in nature; (2) that determined by desire or feeling, which partakes of both the involuntary and voluntary nature, and which although partly instinctive may be resisted by the will under the influence of the judgment; and (3) that determined by deliberate volition in response to reason, as in study, scientific games, rational deliberation, etc. The first mental step of the purchase undoubtedly consists of involuntary or reflex attention, such as is aroused by a sudden sound, sight, or other sensation. The degree of this involuntary attention depends upon the intensity, suddenness, novelty, or movement of the object to which it responds. All persons respond to the stimuli arousing this form of attention, but in different degrees depending upon the preoccupation or concentration of the individual at the time. The striking or novel appearance of an advertisement; the window-display of goods; the appearance of the salesman--all these things instinctively arouse the involuntary attention, and the buyer "turns his mind on" them. But this turning the mind on belongs to Hamilton's first class--that of the instinctive response to the sight or sound, and not that aroused by desire or deliberate thought. It is the most elemental form of attention or mental effort, and to the salesman means simply: "Well, I _see_ you!" Sometimes the prospect is so preoccupied or concentrated on other things that he barely "sees" the salesman until an added stimulus is given by a direct remark.