The early modern period is arguably the most pivotal of all in the study of the mind, teeming with a variety of conceptions of mind. Some of these posed serious questions for assumptions about the nature of the mind, many of which still depended on notions of the soul and God. It is an era that witnessed the emergence of theories and arguments that continue to animate the study of philosophy of mind, such as dualism, vitalism, materialism, and idealism.