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Why do cats purr? While many cat owners presume their cat purrs to display pleasure, research suggests otherwise. It was previously theorized that purring was caused by blood surging through the inferior vena cava, a large vein linking to the right side of the heart. Research now suggests the noise derives from a cat's larynx. Felines can constrict the part of their larynx that touches their vocal cords, which causes vibrations with every inhale and exhale. We hear these vibrations as a purr. Scientists have identified that certain brainwaves activate the biological process behind purring. What triggers this? Findings, based on observational studies, suggest cats can purr for many reasons. One study found that your cat can slightly vary their purrs depending on a certain need. Research indicated a difference in the acoustic quality of purrs emitted by cats when attempting to solicit food, compared to when they were generally relaxed or being petted. These food soliciting purrs were also perceived as more urgent and less pleasant sounding by humans. They included high frequency voiced components, like those produced by crying human infants. Studies found hungry cats, looking to be fed, contained an unusual high-frequency element within their naturally low-pitched purr. With these solicited purrs, domestic cats are tapping into our nurturing instincts to give them attention. Their cries of "feed me" are hidden in what may sound like a pleasant purr. Experts have also theorized that your cat may be purring when they're in distress. It's thought that cats might also purr in an attempt to self soothe, potentially helping them to feel calmer or to relieve pain. Cats were observed purring in situations where they are likely to be experiencing stress. It might also be that they're attempting to solicit help from us. Often their behavior and body language may suggest the cat would prefer to be left alone and not to be touched. There is some evidence suggesting the purrs prompt a healing effect in felines. One study published in the New Zealand Veterinary Journal indicated that the vibration of cat purrs could actually promote bone growth and heal soft tissue. Despite these findings, no large-scale trials have investigated the effect on humans. So, if you ever cut yourself, a doctor is unlikely to advise holding a purring kitty to help heal your open wound. ~ Vivian Walker, vivr@sbcglobal. net 38 FOUR SEASONS BREEZE | APRIL 2021 Tails & Trails - All Pets