How did Rene descartes explain about life in man?

Descartes believed that life in man was dependent on the interaction between the mind (a thinking, non-physical substance) and the body (a physical, non-thinking substance). He proposed that this interaction occurred in the pineal gland, where the mind communicated with the body to produce human behavior. This dualistic view of the mind-body relationship is a key aspect of Descartes' philosophy.