Which root refers to the physical and not just the psychological aspect of the mind?

The root that refers to the physical aspect of the mind, as opposed to just the psychological aspect, is "Ment/o." This root is derived from the Latin term "mens," which means "mind." It encompasses both the mental faculties and the tangible or physical aspects of mental processes, such as brain functions and neural activities.

The other roots have specific meanings that do not relate to the physical aspect of the mind. "Men/o" is often associated with menstruation and related to the female reproductive system. "Metr/o" typically refers to measurements or the uterus, and "Mi/o" is related to the function of muscles or contraction. Thus, "Ment/o" is the appropriate choice when discussing the physical elements of mental function.