Abstract

The Doctrine of Specific Nerve Energies has been and continues to be enormously influential in the physiology, psychology, and philosophy of perception. In simple terms, the Doctrine states that we directly perceive in the first instance the activity of our nerves, rather than properties in the external world. The canonical early statement of the Doctrine by the physiologist Johannes Peter Müller had profound influence on both the phi- losophy and psychology of the 19th and early 20th centuries, especially as reformulated and transmitted by Müller’s student Helmholtz. A common assumption of historical and ongoing debate about the Doctrine has been its supposedly idealist or skeptical implications. What is not commonly recognized is that Müller himself ad- vanced a realist interpretation along lines that would be recognized today as a form of epistemic structural realism. This paper analyzes Müller’s structuralist epistemology in detail and reconstructs his articulation and defense of the Doctrine of Specific Nerve Energies in its canonical form. Part II argues for the continued im- portance of the Doctrine and its structuralist interpretation for contemporary psychology, philosophy of per- ception, and history of philosophy of science.