Distinguish between mediate and immediate experience.
According to Wundt, the simpler mental elements are responsible for giving one, the so called feeling of experience. Feelings like discomfort, happiness are all experiences which are derived from these mental processes.
Mediate experience gives information about something, and does not tell anything about the elements of experience. For example, the sky is blue. This statement just tells us that the sky is blue and says nothing about the experience of it. This is called mediate experience.
Wundt believed in the immediate experience and not in the mediate experience. He thought that mediate experience loses all the knowledge of the element itself, and just provides knowledge about something
However, immediate experience tells about the feeling of blueness of the sky. It takes into account the element of experience. For Wundt, the immediate experience is untainted and unbiased and highlights one’s own feeling about the experience.
If someone says “I have a backache”. It simply means that a person has a backache. This would be mediate experience, but when someone is feeling the discomfort and pain of a backache, it is called an immediate experience.