The article is concerned with various manifestations of motivation in terms of specific shifts of particular motives geared toward significant learning objectives during the study. Motivation as a system of causes does not cover all possible cause and effect relations and in terms of activity approach this involves systematized and generalized activities. Dynamic system of learning motivation of students studying science and humanities at Armenian Pedagogical University reveals increase of some measures of learning in the second year and further decrease of measures of extrinsic motives. Complex study of a variety of motive sets shows inconsistency of data there is, though, some increase of certain measures of learning and professional development motives in the second year.