Inspired by Charles Baudelaire’s concept of the flaneur (an individual who wanders the urban landscape with the intent of experience), Guy Debord elaborated upon the relationship between an individual and the interaction with a public environment. In his 1955 essay, Introduction to a Critique of Urban Geography, Debord defines psychogeography as “the study of the precise laws and specific effects of the geographical environment, consciously organized or not, on the emotions and behavior of individuals.”
More examples of psychogeography in relation to art from the Tate Gallery: http://www.tate.org.uk/learn/online-resources/glossary/p/psychogeography
Featured image by Andreas Tille (Own work) via Wikimedia Commons