Now that psychoanalysis is on the wane, inevitably earlier opinions in psychiatry will resurface. In Motor Disorder in Psychiatry, Daniel Rogers reminds us that in the 19th century, Griesenger in Germany called insanity "a disease of the brain" and Maudsley in England said, "The deranged mind is no more than the deranged function of the supreme nervous centers of the body."
In the 1930s several outstanding New York psychiatrists and neurologists followed up the influenza and encephalitis lethargica epidemics of 1918. They found that at least 20% of their patients had long-term psychiatric disturbances of various categories, including schizophrenia. I wondered at the time why this had made no impact on psychiatric thinking. Perhaps our "love affair with psychoanalysis" blinded us to the organicity of psychiatric illness.
Rogers sees how psychology, though inadequate, can satisfy the need for an understandable etiology. But he calls various insights by the greatest neurologists
Somerfeld-Ziskind E. Motor Disorder in Psychiatry: Towards a Neurologic Psychiatry. JAMA. 1994;272(3):244. doi:10.1001/jama.1994.03520030088040