The fact that psychical data arises in the form of cognitions rather than in
the form of perceptions hardly constitutes a basis for considering them as mere
figments of the imagination Such an extreme skepticism would in truth lead to its
exact opposite, an almost mystical conception of human creativity. While human
imagination is indeed capable of conceptions which have no correspondence with reality
(e.g., werewolf), its creativity is limited to creative arrangements (associations) of
notions derived from some form of experience (e.g., the synthesis of a man and a wolf).
With notions as abstract as mind, consciousness, will, etc., there is no perceptual
(sensuous) experience that could possibly account for their origin. Unless we accept
the implausible presumption that imagination is capable of constructing fantasies
out of "thin air," the reality of nonreducible psychical conceptions for which
there is no apparent origin in perceptually derived experience seems to me as
incontestable as the reality of nonreducible notions derived through the senses.
As to the peculiar status of psychical data in that it seems devoid of any
coordinates of space, neither categorical nor causative inferences are dependent upon
them. Nor is measurement. Measurements need merely be limited to measurements in
time. As to difficulties which might arise with conducting experiments, it should
be remembered that experiments are merely artificially arranged observations. While
they are frequently convenient, they are by no means a necessary prerequisite.
Relativity was confirmed by an observation (aberration of light during a solar eclipse)
rather than a laboratory experiment in which the objects being observed were subjected
to an artificial arrangement.