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Significance The study of the integration between sensory inputs and motor commands has greatly benefited from the finding that in sleeping oscine birds, playback of their own song evokes highly specific firing patterns in neurons also involved in the production of that song. Nevertheless, the sparse spiking patterns that can be recorded from few single neurons gives limited information of the overall activity of the song system. Here, we show that this response is not restricted to the central nervous system but reaches vocal muscles. Combining this integrated measure of the activity of the system with surrogate synthetic songs, we found an all-or-nothing or switch-like activation of the song system.

Syringeal EMGs and synthetic stimuli reveal a switch-like activation of the songbird’s vocal motor program