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She earned her Ph.D. in Psychology in 1985 at the University of Strathclyde where she studied development in infants through the joint-interactions with their mothers. From 1984 through 1986, Heckhausen worked as a post-doctoral fellow at the Center for Life-Span Psychology at the Max-Planck-Institute for Human Development in Berlin.
In psychology, developmental stage theories are theories that divide psychological development into distinct stages which are characterized by qualitative differences in behavior. [1] There are several different views about psychological and physical development and how they proceed throughout the life span.
Glen Elder theorized the life course as based on five key principles: life-span development, human agency, historical time and geographic place, timing of decisions, and linked lives. As a concept, a life course is defined as "a sequence of socially defined events and roles that the individual enacts over time" (Giele and Elder 1998, p. 22).
Socioemotional selectivity theory (SST; developed by Stanford psychologist Laura L. Carstensen) is a life-span theory of motivation.The theory maintains that as time horizons shrink, as they typically do with age, people become increasingly selective, investing greater resources in emotionally meaningful goals and activities.
Paul B. Baltes (18 June 1939 – 7 November 2006) was a German psychologist whose broad scientific agenda was devoted to establishing and promoting the life-span orientation of human development. He was also a theorist in the field of the psychology of aging.
Emerging adulthood, early adulthood, or post-adolescence refers to a phase of the life span between late adolescence and early adulthood, as initially proposed by Jeffrey Arnett in a 2000 article from American Psychologist.
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The lifespan perspectives of personality are based on the plasticity principle, the principle that personality traits are open systems that can be influenced by the environment at any age. [5] Large-scale longitudinal studies have demonstrated that the most active period of personality development appears to be between the ages of 20–40. [ 5 ]