Brightness and size transposition by rhesus monkeys

Abstract

Two experimentally naive adult rhesus monkeys were trained on a VR4 schedule to make brightness discriminations. Transposition tests showed that these monkeys discriminated on the basis of absolute rather than relative brightness. These monkeys and a third (naive) one were trained by the same method to make size discriminations. Size transposition tests showed that the monkeys responded to absolute rather than relative size. The monkey with no training on brightness discrimination had much broader generalization gradients, replicating the results of other investigations of size transposition. © 1987, The psychonomic soceity, inc. All rights reserved.