Supplement to Descartes and the Pineal Gland

Figure 2

Figure 2

Figure 2. Qusta ibn Luqa's Theory (modern schematic reconstruction, view from the left). Thinking is associated with the animal spirit in the middle ventricle (II), memories are stored in the posterior ventricle (III). Left: people who want to remember look up because this raises the worm-like obstacle and enables the passage of memories from the posterior to the middle ventricle. Right: people who want to think look down because this depresses the worm-like obstacle and isolates the middle ventricle from the contents of the posterior ventricle.

Return to text.

Copyright © 2013 by
Gert-Jan Lokhorst <>

This is a file in the archives of the Stanford Encyclopedia of Philosophy.
Please note that some links may no longer be functional.