Many axons, especially the larger ones, are insulated by a surrounding layer of fatty material called the _______________

__________ rewards given after a person has completed a task inform a person that he or she has done well

a. Intrinsic b. Informational c. Control-based d. Mastery

At this time, the etiology of somatic symptom disorders is poorly understood and usually approached from a ________ perspective

A) physiological B) psychological C) medical D) interpersonal