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What problems did the Cartesian view of the mind create for later philosophers?

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Fragment of a Roman fresco showing Socrates seated and draped in a white robe, with Greek text above, on a red background with visible cracks. — Philosophical anthropology Socrates, Roman fresco, 1st century bce; in the Ephesus Museum, Selçuk, Turkey.

The Cartesian view of the mind, formulated by René Descartes, established substance dualism—the idea that the mind is an immaterial, nonextended substance fundamentally distinct from the physical, extended body. This framework created significant challenges for later philosophers, primarily regarding the mind-body problem:12

The Problem of Interaction: Because mind and body were defined as radically different substances, it became difficult to explain how they could causally influence one another. Descartes’s own suggestion—that interaction occurs in the pineal gland—was widely viewed as unsatisfactory.13
Mechanistic Conflict: Cartesian physics viewed the material world, including the human body, as a deterministic, mechanical system. This left no clear space for a nonphysical mind to intervene without violating the laws of physics.23
Conceptual Obscurity: Critics struggled to conceive of what an "immaterial substance" actually is, leading many to reject dualism in favor of monism or materialism.14

These difficulties prompted various responses, including occasionalism, parallelism, and epiphenomenalism, as thinkers sought to reconcile the mental and physical realms.13