Contingent or non-contingent schedules of reinforcement were used in a maintained-generalization testing procedure. Four adult male white Carneaux pigeons with previous experience in generalization-testing procedures served as subjects. Subjects pecked a key for food reinforcement in the presence of various line-tilt orientations. A discrete-trial procedure with stimulus durations of eight sec. and a mean intertrial interval of 45 sec. was used. No difference in the shape of the obtained gradient as regards the presence or absence of a response contingency was observed, Results are discussed in relation to work on interoceptive vs exteroceptive stimulus control of behavior.
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