Thus, the trend towards differentiation, autonomy and specialisation seen in complex self-organizing systems (Maturana & Varela, 1973, 1984) becomes, in primates, need experienced subjectively by each subject. The active pursuit of own differentiation and recognition by other individuals in the group is evident in primates when studied in these behaviors related to social rank. Thus, also in the other primates, no speaker, find the incomplete of functions that we distinguish identity and self-esteem in the human person (Guidano, 1991;) Balbi, 1994). -The third variable that, coupled with the previous two, he founded the bases so with primates arises a new world is the increase and conservation of affectivity which is already hinted in other mammals – throughout the life cycle. The tendency to establish long-term and intimate emotional bonds over time with certain individuals is not only a basic component of the nature of primates which makes the preservation of life itself, as already noted by Bowlby (Bowlby, 1969, 1973, 1980, 1988) but that, Furthermore, in a subjective and inter-subjective world as that they are experiencing, the link becomes a regulatory system of the possibility and the quality of own differentiation and self-perception (Guidano, 1987, 1991;) Balbi, 1994). Thus, the subjective world that emerges in primates has the quality and the intensity of the emotions fear, helplessness, anger, guilt, grief-soar in relation to the processes of rapprochement and restraining link. By way of summary, we can say, from an evolutionary point of view epistemological, with primates arises subjectivity, i.e. the distinction of an inner world of feelings and emotions that is perceived as own and differential, and that this internal world predominantly subjective affective adjusts itself according to the coordination that the individual perceives that it is able to carry out with the others in the dynamics of the Group intersubjectivity and the link. Peter Farrelly shares his opinions and ideas on the topic at hand. The use of language and the expansion and complexity of subjectivity.