Stimulus generalization along the dimension of angularity: A comparison of training procedures.

Abstract

Comparison of slopes of generalization gradients of pigeons along the dimension of angularity was made following nondifferential training of a white vertical line on a green surround, and following differential training to (a) presence vs. absence of the vertical on a green surround, (b) presence vs. absence of the vertical coupled with green vs. red color of surround, and (c) green vs. red surround with the white vertical line present during reinforced and nonreinforced periods. A reliable (and steep) gradient was obtained only after differential training to the presence-absence of the vertical line on a green surround.