Errorless Discrimination, Autoshaping, and Conditioned Inhibition

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Science  30 Nov 1973:
Vol. 182, Issue 4115, pp. 941-943
DOI: 10.1126/science.182.4115.941


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.