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Rapid Sensorimotor Reinforcement in the Olfactory Striatum
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Rapid Sensorimotor Reinforcement in the Olfactory Striatum
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Paper
Rapid Sensorimotor Reinforcement in the Olfactory Striatum
2019
Overview
Rodents can successfully learn multiple, novel stimulus-response associations after only a few repetitions when the contingencies predict reward. The circuits modified during such reinforcement learning to support decision making are not known, but the olfactory tubercle (OT) and posterior piriform cortex (pPC) are candidates for decoding reward category from olfactory sensory input and relaying this information to cognitive and motor areas. Here, we show that an explicit representation for reward category emerges in the OT within minutes of learning a novel odor-reward association, whereas the pPC lacks an explicit representation even after weeks of overtraining. The explicit reward category representation in OT is visible in the first sniff (50-100ms) of an odor on each trial, and precedes the motor action. Together, these results suggest that coding of stimulus information required for reward prediction does not occur within olfactory cortex, but rather in circuits involving the olfactory striatum.
Publisher
Cold Spring Harbor Laboratory Press,Cold Spring Harbor Laboratory
