[66] Ziehen declares (p. 129) that the problem of physiological
psychology consists in reducing the different forms of thinking up to
the most complex argumentation to simple associations of ideas and its
laws. Wundt says, that there are many psychical idea-combinations which
cannot be explained simply by association of ideas. So, Ziehen continues
(p. 130), Wundt assumes above idea associations a special faculty of the
soul called apperception, which serves now as attention, now as will, but
is in either case a metaphysical faculty of the soul, the active subject
which independent of mechanical causality is said to be the cause of
these phenomena.—I do not think that anyone who knows Wundt will accept
this as a fair representation of his views.