A cortically gated sensory reference to the basal ganglia guides vocal reinforcement learning in songbirds

In juvenile male Taeniopygia guttata, tutor song evokes subthreshold depolarizations in Area X that inversely scale with imitation proficiency across learning, and HVC gating controls this input.

• Why it matters: Reinforcement learning models require a basal ganglia access to a tutor-song representation, but whether Area X contains such a temporally aligned reference and how it arrives was unknown.
• What they did: The study used age-dependent Area X lesions, intracellular recordings in awake juveniles, and circuit perturbations by silencing or disinhibiting HVC to test tutor-evoked responses.
• The result: Earlier Area X lesions impaired imitation more severely, and HVC inhibition reduced tutor-evoked depolarizations while disinhibition enhanced them, implying an inhibitory HVC gate routes the tutor reference needed for reinforcement-driven vocal learning.

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