Domestic cat larynges can produce purring frequencies without neural input

Herbst and colleagues challenged the long-held assumption that purring requires continuous, cyclical neural commands to the laryngeal muscles. Working with excised cat larynges, they showed that simply passing air through the isolated larynx could produce self-sustaining oscillations at typical purr frequencies, with no muscle activity or nervous system involvement. They identified connective-tissue masses, or pads, within the vocal folds that they argued lower the oscillation frequency enough to generate the characteristic low-pitched purr through a passive, aerodynamically driven mechanism akin to human vocal fry. The findings suggest purring may rely on special biomechanical properties of the feline vocal folds rather than solely on a neural oscillator, reopening a decades-old debate and proposing a hybrid view in which anatomy and possible neural priming together produce the purr.