High Quality Content by WIKIPEDIA articles! Structural information theory (SIT) is a theory about human perception and in particular about perceptual organization: the way the human visual system organizes a raw visual stimulus into objects and object parts. SIT was initiated, in the 1960s, by Emanuel Leeuwenberg and has been developed further by Hans Buffart, Peter A. van der Helm, and Rob van Lier. It has been applied to a wide range of research topics, mostly in visual form perception but also in, for instance, visual ergonomics, data visualization, and music perception.