A vast number, perhaps the numerical majority, of animal forms cannot be shown unequivocally to possess mind. - Charles Scott Sherrington

In the training and in the exercise of medicine a remoteness abides between the field of neurology and that of mental health, psychiatry. It is sometimes blamed to prejudice on the part of the one side or the other. It is both more grave and less grave than that. It has a reasonable basis. It is rooted in the energy-mind problem. Physiology has not enough to offer about the brain in relation to the mind to lend the psychiatrist much help.

The influence of mind on the doings of life makes mind an effective contribution to life. We can seize then how mind counts and has counted. That it has been evolved seems to assure us that it has counted. How it has counted would seem to be that the finite mind has influenced its individual's 'doing'. Lloyd Morgan, the biologist, urged that, 'the primary aim, object, and purpose of consciousness is control'. Dame Nature seems to have taken the like view.

[A]s followers of natural science we know nothing of any relation between thoughts and the brain, except as a gross correlation in time and space.