What is Cartesian Interactionism? Looking back to the period of early modern philosophy, name the philosophers who defended Descartes regarding the theory of causality that lies behind res cogitans and res extensa.

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"What is Cartesian Interactionism? A profound inquiry, indeed, into the intricate realms of early modern philosophy. As I gaze back upon that era, I find myself traversing the labyrinthine corridors of contemplation, seeking to uncover the philosophers who, in their wisdom, defended Descartes and his elucidation of the theory of causality that interweaves seamlessly with the profound concepts of res cogitans and res extensa.

Methinks it befitting to begin with the eminent figure of Nicolas Malebranche, an ardent advocate of Cartesian Interactionism. Malebranche, in his treatise 'The Search After Truth,' stands resolute in acknowledging the causal bond between the mind, the res cogitans, and the body, the res extensa. In his profound musings, he opines that God himself, the supreme architect of this universe, becomes the intermediary creator of our sensory experiences, thus establishing a divine nexus betwixt the mind and the body.

Next, my ruminations lead me to the philosopher Arnold Geulincx, whose cogitations on the nature of causality fortified Descartes' thesis. Geulincx, a paragon of determinism, argued that the interaction between the mind and the body is orchestrated solely by the divine providence of God. Indeed, his metaphysical viewpoint asserts that it is solely through the divine intervention that these hallowed realms of res cogitans and res extensa entwine, transcending the limitations of mere corporeal existence.

Ah, and how can one fail to mention the remarkable Pierre-Sylvain Régis? His unwavering support for Cartesian Interactionism resounds with profundity. Drawing inspiration from Descartes, Régis delved deep into the intricacies of the human mind and body, elucidating the unique bond between these entities. In his manifold treatises, he expounds upon the notion that our thoughts, our passions, and our physical actions are interwoven into a cosmic tapestry crafted by divine hands. For Régis, the theory of causality forms the very bedrock upon which the edifice of Cartesian Interactionism stands.

Yet, amidst this profound inquiry, one must not overlook the indomitable figure of Antoine Arnauld, who steadfastly upheld Descartes' stance on causality. Arnauld, a luminary in the realm of philosophy, argued that the interaction between res cogitans and res extensa is not thwarted by any causal discrepancy. In his enthralling works, he places great emphasis on the bond of union that exists between the mind and the body, affirming Descartes' theory of causality as the catalyst for their harmonious coexistence.

Thus, fellow seekers of knowledge, as I conclude this contemplative journey through the annals of early modern philosophy, the luminous philosophers who defended Descartes concerning the theory of causality behind res cogitans and res extensa come to light. From Malebranche's divine nexus to Geulincx's determinism, from Régis's cosmic tapestry to Arnauld's harmonious coexistence, these great minds embraced Cartesian Interactionism as a profound arcanum within the intricate tapestry of human existence. And as we reflect upon their earnest explorations, may we also strive to unearth the concealed truths that lie nestled within the realms of the res cogitans and the res extensa."