The sensory acts are accordingly distinguished by their objects.

For psychological purposes the most important differences in conation are those in virtue of which the object is revealed as sensed or perceived or imaged or remembered or thought.

When we come to images or memories or thoughts, speculation, while always closely related to practice, is more explicit, and it is in fact not immediately obvious that such processes can be described in any sense as practical.

Both expectations and memories are more than mere images founded on previous experience.

The thing of which the act of perception is the perception is experienced as something not mental.

Such being the nature of mental life, the business of psychology is primarily to describe in detail the various forms which attention or conation assumes upon the different levels of that life.

The mental act of sensation which issues in reflex movement is so simple as to defy analysis.