Cats and optical illusions: Now with control experiments!

Discuss

14 Responses to “Cats and optical illusions: Now with control experiments!”

  1. theophrastvs says:

    egads, Ms Koerth-Baker, you ought to be included as a minor author or at least in the acknowledgements  (…of the resulting paper)

  2. doniphon says:

    Next Step: Double-Blind!

  3. Jorpho says:

    I’ve never actually seen the illusion designed specifically so as not to rotate.  At this stage it is rather unnerving seeing something that clearly looks like it should be moving that isn’t moving.

    Perhaps next we can have a grid of black squares which definitely do not have any grey squares in between them?

  4. Dave Faris says:

    Hey, so why does one seem like it’s moving, and the other doesn’t? I tried to discern the difference, but I can’t spot it. Same colors, same orientation. What’s the crucial difference?

    • jimkirk says:

      rotating:  green white blue.
      Non-rotating:  green white green, blue white blue

      The red/blue one doesn’t rotate for me…

  5. Over the weekend, I tried this using Escher’s “Circle Limit With Butterflies” as a control image. One of my cats ignored both pictures; the other ignored the rotating snakes but was fascinated by the Escher painting: http://youtu.be/KzV0k9j_uB8

    Tonight I tried using all three pictures (the illusion, the “official” control, and the Escher painting), and my cats didn’t really react to any of them: http://youtu.be/4gOAQRwGVh4

    • Felicitas says:

      I just tried the circles from the link on my cat. I used the laptop, so he wouldn’t be distracted by paper. He was so unimpressed that it was nearly impossible to keep him in front of the screen, he just didn’t get what I wanted him to do. This is interesting, as he is sometimes distracted by gifs or videos I watch when he is on my lap. He even tried to catch the figure on the screen one or two times. So I would say, he doesn’t notice the optical illusion at all. 

  6. gmarsden says:

    It looks to me that the non-rotating one has radial lines running straight out from the centre, while the lines in the rotating one form spirals away from the centre (in both clockwise and counter-clockwise directions).

    Ah, I see now that this is a result of the offsetting colours. So I would say that it’s not the order of the colours *within* a ring that matters, but the colours shift as you move from ring to ring.

    Edit: This was meant to be a reply to jimkirk above.

  7. Cola Johnson says:

    Well… I’ve just taken extensive video showing my cat laying on the test and then trying to eat the control. Then she attacked the tiny pieces she ripped off of it. And my other cat tried to attack her by biting her neck during the test.

    Um… hm…

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