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A neural circuit for vocal production responds to viscerosensory input in the songbird.
Journal of Neurophysiology 2023 December 21
Motor performance is monitored continuously by specialized brain circuits and used adaptively to modify behavior on a moment-to-moment basis and over longer time periods. During vocal behaviors, such as singing in songbirds, internal evaluation of motor performance relies on sensory input from the auditory and vocal-respiratory systems. Sensory input from the auditory system to the motor system, often referred to as auditory feedback, has been well-studied in singing zebra finches ( Taeniopygia guttata ), but little is known about how and where non-auditory sensory feedback is evaluated. Here we show that brief perturbations in air sac pressure cause short latency neural responses in the higher-order song control nucleus HVC (used as proper name), an area necessary for song learning and song production. Air sacs were briefly pressurized through a cannula in anesthetized or sedated adult male zebra finches, and neural responses were recorded in both nucleus paraambigualis (PAm), a brainstem inspiratory center, and HVC, a cortical premotor nucleus. These findings show that song control nuclei in the avian song system are sensitive to perturbations directly targeted to vocal-respiratory-or viscerosensory-afferents and support a role for multimodal sensory feedback integration in modifying and controlling vocal control circuits.
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