The distinguishing characteristics of mind are of a subjective sort; we know them only from the contents of our own consciousness.

Physiological psychology is, therefore, first of all psychology.

The materialistic point of view in psychology can claim, at best, only the value of an heuristic hypothesis.

We know, from ordinary life, that we are not able to direct our attention perfectly steadily and uniformly to one and the same object... At times the attention turns towards the object most intensely, and at times the energy flags.

Hence, even in the domain of natural science the aid of the experimental method becomes indispensable whenever the problem set is the analysis of transient and impermanent phenomena, and not merely the observation of persistent and relatively constant objects.

The distinguishing characteristics of mind are of a subjective sort; we know them only from the contents of our own consciousness.

In the course of normal speaking the inhibitory function of the will is continuously directed to bringing the course of ideas and the articulatory movements into harmony with each other. If the expressive movement which which follows the idea is retarded through mechanical causes, as is the case in writing ... such anticipations make their appearance with particular ease.