Generalization Gradients following Differential Intradimensional Autoshaping

Abstract

Three pigeons were trained on a differential, intradimensional autoshaped discrimination. A 45° line tilt was always paired with food whereas a 15° line tilt was never paired with food. All subjects learned the discrimination within 17 sessions. The pigeons were then given generalization tests in extinction over seven line tilts (0°, 15°, 30°, 45°, 60°, 75°, and 90°). The subjects yielded generalization gradients with maxima at 45° and minima at 15°. An area shift, but no peak shift, was found for each subject.