1. Psychophysics of spatial-frequency channels / Norma Graham -- 2. Figure and ground perception in briefly presented isodipole textures / Bela Julesz -- 3. Concurrent-pitch segregation and the theory of indispensable attributes / Michael Kubovy -- 4. Asking the "what for" question in auditory perception / Albert S. Bregman -- 5. The analysis of unanalyzed perceptions / W.R. Garner -- 6. Perceptual organization in information processing / James R. Pomerantz -- 7. Perceptual organization and attention / Daniel Kahneman and Avishai Henik -- 8. On the semantics of a glance at a scene / Irving Biederman -- 9. Levels of perceptual organization / Julian Hochberg -- 10. Psychophysical complementarity / Roger N. Shepard -- 11. Coalitions as models for ecosystems : a realist perspective on perceptual organization / Robert Shaw and M.T. Turvey -- 12. Three approaches to perceptual organization : comments on views of Hochberg, Shepard, and Shaw and Turvey / Fred Attneave -- 13. Perceptual organization : an overview / James R. Pomerantz and Michael Kubovy.