Cerebral localization in the eighteenth century--an overview

Area of Science:

• Neuroscience
• History of Science
• Philosophy of Mind

Background:

• 18th-century scientific inquiry into cerebral functions involved diverse theories, merging ancient ideas with new doctrines.
• Scholars debated localization, with some placing the sensorium commune in structures like the corpus callosum or cerebellum.
• Philosophical conjectures and physiological experiments coexisted with anatomical, pathological, and surgical observations.

Observation:

• A shift towards holistic brain function concepts emerged around 1750.
• Albrecht von Haller's doctrine of equipotentiality proposed uniform function across cerebral structures, including the cortex.
• Samuel Thomas Soemmerring's hypothesis identified ventricular fluid as the soul's organ, a view later refuted.

Findings:

• The premodern era of cerebral localization concluded with the refutation of Soemmerring's hypothesis and the emergence of Gall's doctrine.
• The paper reconstructs key arguments and experiments from this period.
• Eighteenth-century debates on the mind-body problem show striking parallels with contemporary discussions.

Implications:

• Understanding historical neuro-philosophical debates provides context for current mind-body problem controversies.
• This historical analysis highlights the evolution of thought in neuroscience and localization.
• The study underscores the cyclical nature of scientific inquiry and philosophical debate.