Substance dualism requires a coherent account of soul-body interaction, yet Descartes' own interactionism faces the problem that causation between wholly disparate substances is unintelligible.

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Descartes: # Descartes René Descartes was a French philosopher and mathematician from the 1600s who fundamentally changed how people think about knowledge and the mind. He's famous for the idea "I think, therefore I am" (cogito ergo sum), which means that the very fact that you can think proves you exist—a foundation for modern philosophy. He also invented the coordinate system used in mathematics (the x and y axes on a graph), which connects geometry and algebra in practical ways we still use today.
Soul-body interaction(as the central problem for dualism): The question of how an immaterial soul or mind can causally affect a physical body (and vice versa)—for example, how a decision in your mind causes your arm to move.
Wholly disparate substances(as describing the gap between mind and body in dualism): Things that are completely different in nature and have nothing in common—like comparing something invisible and non-physical to something physical and material.
interactionism(The position being critiqued in the argument)

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