Activity theory
Activity theory (AT; ) is an umbrella term for a line of eclectic social sciences theories and research with its roots in the Soviet psychological activity theory pioneered by Lev Vygotsky , Alexei Leont'ev and Sergei Rubinstein. These scholars sought to understand human activities as systemic and socially situated phenomena and to go beyond paradigms of reflexology (the teaching of Vladimir Bekhterev and his followers) and classical conditioning (the teaching of Ivan Pavlov and his school), psychoanalysis and behaviorism. It became one of the major psychological approaches in the former USSR, being widely used in both theoretical and applied psychology, and in education, professional training, ergonomics, social psychology and work psychology.
John Neulinger
John Neulinger (April 26, 1924 - June 20, 1991) was a noted German-American psychologist and Professor Emeritus of psychology at City College of New York. Neulinger is best known for contributing a social psychological theory of leisure to the field of leisure studies. Neulinger's theory of leisure is defined by a psychological state of mind that requires two criteria for leisure: perceived freedom and intrinsic motivation. In Neulinger's theory, individuals can be said to be in a state of leisure if they simply perceive that they have the freedom to choose activities and are motivated by an activity for its own sake, not just for its consequences. Neulinger first popularized his ideas in the 1974 book, "The Psychology of Leisure".