Your Mind and How to Use It is a manual of practical psychology. Atkinson begins by refusing the old habit of defining the ultimate nature of mind. Following thinkers such as William James, he treats the mind as something to be used, and bends his attention to the laws of mental activity and the methods by which mental powers can be developed. The whole book is organized around a working classification of the faculties: consciousness, perception, representation through memory and imagination, feeling, intellect, and will.
Attention comes first because so much depends on it. Atkinson distinguishes involuntary attention, caught by any new or striking thing, from voluntary attention, directed by the will toward an object of deliberate choice. We become conscious of the senses only where attention is turned, so the clock can strike unheard while we read. He argues that voluntary attention is the result of training, that it can be built by practice on dull material until interest grows, and that it marks the person of strong will and character.
Perception and memory follow as the powers that turn raw sensation into knowledge. Sensation is only a feeling; perception is the thought that interprets a group of sensations and assigns them to the object that caused them. Most of what the senses report is never perceived at all, so perception too is a skill, sharpened by analysis and by the deliberate habit of noticing detail. Memory is the storehouse of past impressions; its strength depends on the depth of the original impression, on association, and on use, and it can be schooled like any other faculty.
Imagination is the higher representative power. In its reproductive form it differs little from memory, but in its constructive form it arranges remembered impressions into new combinations. Atkinson is careful to insist that imagination invents nothing from nothing: the unicorn, the centaur, and the mermaid are all assembled from parts already seen in nature. Because every invention and every plan is built this way, imagination is treated not as idle fancy but as a working tool of thought, capable of being developed by the same methods as memory.
The will closes the book as the central power of the self. Atkinson describes it in three phases: desire, which supplies the motive force; deliberation, the weighing and balancing of competing desires under the eye of the intellect; and action, the expression of the chosen desire. The will can strengthen or starve a desire by granting or withholding attention, and it is trained chiefly by intelligent use, by forming good habits, and, following James, by regularly doing small disagreeable things so that the will is ready when a real emergency comes. A closing chapter gathers sayings on resolve to tone up the reader's own will.