Visual probability learning in the rat

Abstract

The mean asymptotic choice ratios of three groups of rats trained in 100:0, 70:30, and 50:50 visual problems corresponded closely to the reinforcement ratios. A fourth group of rats, which was shifted to 70:30 after some 100:0 training, continued for many trials to show a preference for the 70% alternative which substantially exceeded that of the 70:30 group. Examination of individual performances revealed a variety of systematic tendencies quite different from the random probability matching found in submammalian forms. © 1971, Psychonomic Journals, Inc.. All rights reserved.