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

But though cognition is not an element of mental action, nor even in any real sense of the word an aspect of it, the distinction of cognition and conation has if properly defined a definite value.

It is more difficult to designate this form of conation on its practical side by a satisfactory name.

But unfortunately Locke treated ideas of reflection as if they were another class of objects of contemplation beside ideas of sensation.

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

In the perception of a tree we can distinguish the act of experiencing, or perceiving, from the thing experienced, or perceived.

The sensory acts are accordingly distinguished by their objects.