42 open experiments
Experiments.
Each one is based on published research and takes a few rounds; most last two or three minutes. At the end you compare your answer with the crowd and read the science behind the finding. Play again as often as you like.
Feel 10 seconds
How precise is your inner clock? Try to hit 10, 3 and 20 seconds without counting, then keep a one-per-second beat, and see whether your error grows with the duration.
How many candies are in the jar?
On its own, your guess is probably off; but what happens when hundreds of guesses come together? And does changing your mind after seeing the crowd actually help?
The Linda problem
Linda, Bill, and a health survey: across four short scenarios, will your intuition win, or the simplest rule of probability?
Name the color, not the word
Stopping yourself from reading is harder than you think: your brain has already read the word, whether you want it to or not. What changes when you flip the task, and when you race the clock?
How fast are you?
There is a gap between the moment your eye sees something and the moment your finger moves, and it grows as the options multiply. But can you stop yourself when you need to?
Which line is longer?
Matching two lines looks easy, until arrowheads, rails, and surrounding circles get involved. We measure how much your eyes are fooled in four illusions.
Spot the change
The scene flickers back and forth; the difference is right in front of you, yet seeing it can sometimes take half a minute. Try change blindness for yourself.
Two-thirds of the average
Everyone picks a number, and the winner is whoever comes closest to two-thirds of the average. The real question: how many steps ahead is everyone else thinking?
Find the target
Some targets pop out of the crowd; others have to be searched for one by one. Measure the speed and limits of your visual search.
Heads or tails: can you be random?
Being random looks easy, but whether people are imitating coin flips or predicting them, they almost always leave the same fingerprint.
The bat and the ball
Seven questions that look easy. The real trap is that they look easy.
Visual memory
Nine squares, one flashing sequence. When you memorize places instead of digits, how many steps can your memory carry?
How many dots?
We see three dots at a glance, but we estimate thirty. Measure how many you can count at a glance and how far off your estimates are.
How sure are you?
Ten questions, and for each one a lower and upper bound you are 90 percent sure about. We measure not what you know, but how well you know what you don't know.
How many people are like you?
Tea or coffee, sea or mountains? Six choices and one question: are there as many people who think like you as you assume? Try the false consensus effect on yourself.
Find the odd shade
First measure your hue and lightness thresholds in ΔE, then in level mode the grid grows while the difference shrinks: how many levels can you clear?
Mirror or not?
The more a letter tilts, the more your mind seems to actually turn it. How fast do you rotate letters, shapes, and images under time pressure?
Digit memory
The digits flash by one at a time. How many can you type back without mixing up the order, and how many are left when you type them in reverse?
Four cards
Four cards, one rule. In psychology's most famous logic puzzle, most people turn over the wrong cards; but move the same logic into a bar scene and things change.
Match the pitch
First measure the smallest pitch difference you can hear between two tones, then match five tones by ear after a short silence. Headphones recommended.
Remember the color
Hold a full-screen color in mind for three seconds, then rebuild it with hue, saturation and brightness sliders. Where does memory shift the color?
Hold the time
The screen fills with color from the bottom up; then it is your turn: lift your finger the moment you think the same time has passed. Across five durations, do you stretch the short ones and shorten the long ones?
Rebuild the shape
A shape appears on the screen for 2.5 seconds and disappears; you rebuild it in the same place, at the same angle and the same size. Where does memory pull angles, sizes and positions?
Remember the spot
Three colored dots appear and disappear one by one; then you tap where each one was. Where does your memory shift the dots: toward the middle of the circle's quadrants, toward the center, or toward the edge?