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In this chapter from Personality and Its Formation in Childhood (1968), L.I. Bozhovich elaborates two concepts proposed by Vygotsky: the concept of psychological age and the social situation of development. They are presented as mechanisms and moving forces of development in addition to the primary needs of the child. The second part of the chapter illustrates her elaboration of the concept of perezhivanie experience as an emotional mechanism in personality development.
L. I. Bozhovich (2009) studied this question.