According to activity theory, social barriers to engagement, not the desires of aging adults, cause declining rates of interaction.
Activity theory 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 Sergei Rubinstein in the 1930s.
Activity theory provides a conceptual framework from which we can understand the inter-relationship between activities, actions, operations and artifacts, subjects' motives and goals, and aspects of the social, organisational and societal contexts within which these activities are framed.
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