THREAD: My Top 12 Favourite Perceptual Illusions

1. A great example of how expectations guide perception.

2. The horizontal lines in this image are all parallel. https://t.co/Y0o0hd8R15 HT @victoria1skye
3. The circles in this image are all the same colour. https://t.co/H4Prys8l0n
4. This isn't a GIF – the movement is all in your head.
5. This looks two photos of the same road, taken from different angles. But it’s just the same photo twice. https://t.co/pdq0iRynFw
6. We don't directly perceive how light or dark objects are; the perceptual system makes an educated "guess" based on the lightness or darkness of the surroundings. https://t.co/C8VwDBJbYx HT @AkiyoshiKitaoka
7. The Dynamic Ebbinghaus: The orange circle doesn't change size. https://t.co/wReYo1466M
8. The Dynamic Müller-Lyer Illusion: The vertical black, green, and blue lines don't change size. https://t.co/bDyeOKXgbC
9. You can make the train change direction. https://t.co/n8AzuhJx26
10. Rotating Rings: Every time you switch from looking at one wheel to looking at the other, they both change direction. https://t.co/IdAQGgXsJi
11. The Spinning Dancer https://t.co/3GAwtsnVAL

If you look at the dancer on the left and the one in the middle, the one in the middle spins clockwise.

If you look at the dancer on the *right* and the one in the middle, the one in the middle spins counterclockwise.
12. Stare at the centre of the top image for 20 seconds then look at the bottom image...

More from All

1. Mini Thread on Conflicts of Interest involving the authors of the Nature Toilet Paper:
https://t.co/VUYbsKGncx
Kristian G. Andersen
Andrew Rambaut
Ian Lipkin
Edward C. Holmes
Robert F. Garry

2. Thanks to @newboxer007 for forwarding the link to the research by an Australian in Taiwan (not on

3. K.Andersen didn't mention "competing interests"
Only Garry listed Zalgen Labs, which we will look at later.
In acknowledgements, Michael Farzan, Wellcome Trust, NIH, ERC & ARC are mentioned.
Author affiliations listed as usual.
Note the 328 Citations!
https://t.co/nmOeohM89Q


4. Kristian Andersen (1)
Andersen worked with USAMRIID & Fort Detrick scientists on research, with Robert Garry, Jens Kuhn & Sina Bavari among


5. Kristian Andersen (2)
Works at Scripps Research Institute, which WAS in serious financial trouble, haemorrhaging 20 million $ a year.
But just when the first virus cases were emerging, they received great news.
They issued a press release dated November 27, 2019:

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