12.15 A matching-to-sample (MTS) task is used by psychologists to understand how other species perceive and use identity relations.

A standard MTS task consists of having subjects observe a sample stimulus and then rewarding the subject if it responds to an identical

(matching) sample stimulus. Then the psychologist studies the ability of subjects to transfer the matching concept to other sample stimuli.
Oden et al. (1988) reported a study in which four infant chimpanzees learned an MTS task with only two training sample stimuli. Then the chimpanzees were tested on their ability to transfer the learning to three kinds of novel items, classified as Objects, Fabrics, and Food. The data were recorded as number of correct matches in a total of 24 trials.
One purpose of the study was to show that the concept of matching is broadly construed by chimpanzees irrespective of the type of sample stimulus. Determine whether the data support this theory.
Chimp Training Object Fabric Food Whiskey 20 22 22 18 Liza 23 19 22 13 Opal 18 20 18 15 Frieda 21 21 19 19