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Journal of Neuroscience, Vol 7, 2285-2292, Copyright © 1987 by Society for Neuroscience
Amygdalectomy and disconnection in visual learning for auditory secondary reinforcement by monkeys
D Gaffan and S Harrison
Nine monkeys in 3 groups took part in an experiment on visual
discrimination learning set in an automatic apparatus. Each new visual
discrimination problem was solved using auditory secondary reinforcers.
Primary food reinforcement was delivered only after a new problem had been
solved to a criterion, and the problem was then replaced by a new one;
thus, within-problem learning relied purely on secondary and not on primary
reinforcement, but the secondary reinforcers were associated with primary
reinforcement. Bilateral amygdalectomy severely retarded within-problem
learning. Disconnection of the amygdala from auditory input, by crossed
unilateral lesions of amygdala and of auditory cortex combined with
forebrain commissurotomy, had a similar effect to that of bilateral
amygdalectomy. Disconnection of the amygdala from visual association cortex
left learning unimpaired. Thus, for normal performance in this task,
interaction of the amygdala with the sensory modality of the secondary
reinforcer was essential, but interaction of the amygdala with the sensory
modality of the discriminative stimuli was not necessary. It was concluded
that the amygdala is involved in associating stimuli with the primary
reinforcing attributes of food reward, and not with its other attributes.
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