Research overview: how cats purr and the laryngeal oscillation hypothesis

Purring is a distinctive feline vocalisation produced continuously through inhalation and exhalation, and this overview reviews how it is generated. The leading view holds that rapid, rhythmic contraction and relaxation of the laryngeal muscles, driven by a neural oscillator, repeatedly open and close the glottis, modulating airflow to create the low-frequency purr in both breath phases. A recent alternative emphasises passive vocal-fold properties. Researchers study purring through electromyography, airflow measurement, and acoustic analysis. Why it matters: purring is one of the most familiar yet biomechanically puzzling animal sounds, unusual for being sustained across the whole breathing cycle, and clarifying its mechanism illuminates the unique laryngeal control of cats while connecting a comforting everyday behaviour to active debate about exactly how the feline voice box works.