Abstract
Using a successive discrimination task, 4 pigtailed monkeys, 1 Japanese macaque, and 1 rhesus monkey were given 54 separate 60-sec. opportunities to open an instrumental door on a random 50% schedule of mirror-image reinforcement. Although no evidence of discrimination learning was found, the reinforcing value of the mirror was demonstrated by measures of total duration of all responses on each trial and average duration of each response which showed significant differences in favor of trials accompanied by mirror exposure.
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