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Why Do Cats Purr? Science Explains

The enigmatic nature of cats has always captivated us, and one of their most calming — and perplexing — behaviors is purring. That steady, gentle hum is more than just a sign of satisfaction. Beyond expressing happiness, research has shown that purring has a number of unexpected uses.

The Sound’s Scientific Basis

The brain repeatedly sends neural signals to the laryngeal muscles, which produce a cat’s purr. The distinctive sound we know as a purr is produced when these muscles twitch at a rate of 25 to 150 vibrations per second (Hz), causing the vocal cords to suddenly separate.

What Causes Cats to Purr?

  • To Express Cosiness and Attachment
    Cats purr to connect with people and kittens, but they also do so when they’re happy, like when they’re curled up on your lap. Kittens start purring a few days after birth as a safety signal, and mother cats use purring to soothe their young.
  • To Capture Your Interest
    Particularly during mealtime, some cats manipulate their humans with a particular kind of purr that is combined with a high-pitched cry. The purpose of this “solicitation purr” is to get your attention and make you take action.
  • As a Self-Healing Mechanism
    Researchers think purring may have therapeutic benefits. It has been demonstrated that purring at a low frequency (about 25–50 Hz) can strengthen bones, lessen pain, and encourage tissue regeneration. This may explain why cats purr when they are hurt or sick.
  • For Stress Reduction
    Unexpectedly, cats will purr when they’re anxious or afraid, like when they’re at the vet. Similar to how people may hum or talk to themselves under stress, experts believe it to be a self-soothing mechanism.

Concluding remarks

Purring is a sophisticated form of self-care and communication that goes beyond just being a cute oddity. That little rumble has a lot to say, whether your cat is happy, recovering, or simply attempting to attract your attention.


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