Cue dominance in oddity discriminations by rhesus monkeys.

Abstract

Six rhesus monkeys were tested on 350 oddity problems which differed in color, form, size, or a combination of these. Color differences, either alone or combined with other cues, were significantly more easily discriminated than form or size differences; systematic learning effects were present only for problems involving color; combining cues resulted in no increase in discriminability. Results support previous findings that color is a dominant discrimlnandum for monkeys.