SENSORIUM
AfterimageGoal mode
Attempt1 / 5
Record boardSample
Window12deg
Your best--
Global best4.0 deg
Plays9,952
Rank--
Difficulty
12345
Seehold ghost
Catchtime the burn
Ghost choices
Flash window560ms

Perception game notes

Afterimage: what this game measures

Afterimage flashes luminous shapes once, then asks you to pick the ghost arrangement your eye retained.

Signals tested

  • retinal afterimage memory
  • angle recall
  • shape arrangement recognition

How scoring works

The game compares your selected ghost set with the flashed target and reports angular drift in degrees.

Practice note

Try to hold the arrangement as a single cluster. Chasing the brightest edge tends to rotate the remembered shape.

How to play

  1. Start the flash and hold the whole shape arrangement in mind.
  2. Wait for the choices to appear after the flash is gone.
  3. Select the ghost set that best matches the remembered arrangement.

How to read the result

Low angular drift means the arrangement stayed intact. Higher drift means one or more shapes rotated, swapped emphasis, or were reconstructed from the wrong edge.

Accessibility note

The game uses high-contrast flashes. Players sensitive to flashing visuals should skip this challenge or use another Sensorium game.