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Measurement of time of inspiration onset. The trace shows thoracic movement over time, with time = 0 set to the time milk transits over the laryngeal opening, the precise timing of the swallow. The amount of thoracic movement is idiosyncratic to the animal, depending on their size, and the values are scaled to maximum movement in the sequence. The lag from the swallow to the start of thoracic expansion was measured for each swallow in the data set.
