Studies of excised cat larynxes reveal role of connective tissues embedded in vocal folds.
  • Spzi@lemm.ee
    19·
    9 months ago

    First, the researchers excised the larynxes of eight newly deceased domestic cats, all of which had contracted terminal diseases, resulting in their euthanization. (The owners gave explicit consent for this removal.) The larynxes were promptly flash-frozen in liquid nitrogen and stored at -20° Celsius. They were slowly thawed at room temperature the night before the experiments. Each larynx was cleaned, photographed, and mounted on a vertical tube, which was used to supply heated air with 100 percent humidity to the larynx.

    The larynxes were stabilized using LEGO blocks and 3D-printed plastic mounts, and mini-electrodes were attached to the thyroid cartilage, one on each side, to record the electroglottographic (EGG) signal. Gradually opening and closing a magnetic valve in the air supply chain controlled the subglottal pressure by pumping in air, which drove the oscillation in the mounted larynxes. (One larynx also underwent standard histological analysis, while another was CT scanned.)

    The authors successfully produced purring sounds in all eight of the excised larynxes when air was pumped through them, with no need for muscle contractions—given that all the adjacent muscles had been removed when excising the larynxes. So what was driving the purrs?

    Fascinating, this took a few unexpected turns.

    • onoOPEnglish
      19·
      9 months ago

      One larynx also underwent standard histological analysis, while another was CT scanned.

      Also known as a computed axial tomography scan, or CAT scan. :)

    • Catoblepas@lemmy.blahaj.zone
      35·
      9 months ago

      Cats are a living exercise in consent. If cats are always assholes to you it’s either because you can’t read their body language or you’re ignoring it.

      • I_am_10_squirrels@beehaw.org
        8·
        8 months ago

        What does consent have to do with pushing everything off counters? Or walking up to the dog and smacking it on the snout? This is what I always think of when people mention that cats are assholes.

        • alfonsojon@beehaw.org
          4·
          8 months ago

          It’s easy to think cats are assholes when you project human behavior onto cats. Cats don’t knock objects off of tables to be assholes, they probably don’t even know what being an asshole means. Also, relating to the comment above, dogs are not good at consensual behavior or understanding a cat’s body language when they are bothering the cat, so the cat may perceive the dog as a threat or nuisance, causing the cat to slap the dog.

          I’ve had a cat now for about 7 years and before that I never really thought I would like cats. He’s like a son to me and he is very sweet, but you have to understand his body language. Whenever I have visitors, I will let them know if he is not liking whatever they are doing, so that they can avoid getting slapped or bit. Cats are different than dogs in that way. Also, similar to people, cats have different levels of patience and every cat is different in this regard. Some cats will let you mess with them constantly, while other cats prefer having their own space and being handled on their own terms.

    • mermaldad@beehaw.org
      191·
      8 months ago

      Cats, like most animals and indeed people, exhibit a variety of personalities and behaviors. Dismissing them all as “assholes” is like stereotypng people based on race, gender, ethnicity, etc. It’s a weak argument. Combined with your “that’s not up for debate” makes me wonder if you are just trolling us.