In Aristotle the mind, regarded as the principle of life, divides into nutrition, sensation, and faculty of thought, corresponding to the inner most … - Wilhelm Wundt

The whole task of psychology can therefore be summed up in these two problems : (1) What are the elements of consciousness ? (2) What combinations do these elements undergo and what laws govern these combinations ?

We call that psychical process, which is operative in the clear perception of a narrow region of the content of consciousness, attention.

If we take an unprejudiced view of the processes of consciousness, free from all the so-called association rules and theories, we see at once that an idea is no more an even relatively constant thing than is a feeling or emotion or volitional process. There exist only changing and transient ideational processes ; there are no permanent ideas that return again and disappear again.