The Song Remains the Same.
Deafness causes speech to deteriorate, but whether this deterioration reflects an active or passive process is unclear. Birdsong - a learned vocal behavior that resembles speech in its dependence on auditory feedback - also deteriorates following deafening. In their 2000 paper, Brainard and Doupe showed that, following deafening, birdsong deteriorates through an active process mediated by a cortex-basal ganglia (BG) circuit.
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