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Biomechanical properties of syrinx muscles match the ISI distribution of the last premotor neurons driving them. A, B, The tRef and summation threshold (fsum) of syrinx muscles match the boundaries of the RA–ISI distribution before the start of song learning (A) as well as after crystallization (B). The majority of ISIs lie between tRef and ffused. The ISI probability density plots are modified from the study by Ölveczky et al. (2011).
