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Science 30 November 1973:
Vol. 182. no. 4115, pp. 941 - 943
DOI: 10.1126/science.182.4115.941
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Articles

Errorless Discrimination, Autoshaping, and Conditioned Inhibition

Michael G. Wessells 1

1 Department of Psychology, University of Massachusetts, Amherst 01002

Pigeons were exposed to a discriminated autoshaping procedure in which brief presentation of a green light on a key was always followed by food whereas presentation of a vertical white line on the key was never followed by food. Pigeons acquired an errorless discrimination by pecking reliably in the presence of the green light but never in the presence of the line. The line inhibited pecking in later tests: when the white line was paired with food, key peck acquisition was retarded; and when the white line was superimposed on the green background, responding was suppressed.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)