Toward the end, I think the confounding effect of the afterimages of the discs w... | Hacker News

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		wrs on April 21, 2025 \| parent \| context \| favorite \| on: Find the Odd Disk Toward the end, I think the confounding effect of the afterimages of the discs was bigger than the difference between the discs. (That is, when looking at the three discs in turn, the effect of the afterimage of disc 1 on judging disc 2, etc.)

aimor on April 21, 2025 | [–]

I noticed this too. I did much better covering up two of the disks and looking at them one at a time, or comparing pairs of disks.

gblargg on April 21, 2025 | [–]

It could rearrange the discs each time to avoid this issue, perhaps just flipping the pattern vertically each time.

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