"Psychogeography could set for itself the study of the precise laws and specific effects of the geographical environment, consciously organised or not, on the emotions and behaviour of individuals. The adjective, psychogeographical, retaining a rather pleasing vagueness, can thus be applied to the findings arrived at by this type of investigation, to their influence on human feelings, and even more generally to any situation or conduct that seems to reflect the same spirit of discovery."  
--Guy Debord  
From "Introduction to a Critique of Urban Geography" originally published in the Belgian surrealist journal "Les Levres Nues" number 6, September 1955. (Stewart Home. The Assault on Culture; Utopian Currents from Lettrisme to Class War. Stirling: A.K. Press, 1991.)