[playful page] Toys, not tests. They run in your browser and send nothing anywhere.

ou will find six small toys here, each built on a real finding in perception or reasoning. Play one, then read the note under it: what the effect is, who found it, and what a two-minute toy on a phone cannot tell you. NEW Toy of the hour: all of them.Morning pickAfternoon pickEvening pickSmall-hours pick, changing every hour: the Stroop boxthe arrow linesspot the changethe reaction boxthe line judgethe four cards

	the Stroop box — name the ink, not the word
	the arrow lines — make two lines equal, if you can
	spot the change — two pictures, one difference, a blink between them
	the reaction box — how fast is "as fast as you can"?
	the line judge — which line is longer, and by how little can you tell?
	the four cards — which cards do you need to turn over?

First time on the shelf? The four cards take one minute and fool most people.You keep coming back (visit 3 by your browser's count). The line judge rewards patience. It is the middle of the night where you are; tiredness slows reactions and blunts attention, so go easy on the reaction box's verdict.

under construction

Anchoring. We wanted a seventh toy for anchoring: an arbitrary number shown first pulls a later estimate toward it (Tversky & Kahneman, 1974). It is not here because it would be dishonest as a one-person toy. The effect shows up as a difference between groups given different numbers, so a single visitor making one estimate cannot see it in themselves. If we find a fair way to show it, it goes up here.

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Sources

1. Tversky & Kahneman (1974). Judgment under Uncertainty: Heuristics and Biases. Science. doi:10.1126/science.185.4157.1124

see also