Suggested Citation

James Dougan, J. A. Dinsmoor, E. Thiels, D. M. Lee, and J. F. Pfister. "Selective Observing: Pigeons Turn Discriminative Stimuli On and Off by Pecking Separate Keys" Psychobiology: Issues and Applications. Ed. Nigel W. Bond and David A.T. Siddle. Amsterdam/New York: North-Holland/Elsevier Science, 1989. 415-428.