Motion aftereffect

Trigger the waterfall illusion with a single adaptation run

Stare at moving texture and the static test will drift the other way. Press start, fixate the cross, then scroll down to fine-tune every detail of the lab.

Live canvas

Step 1 · Adaptation run

Start the timer and keep your eyes on the cross

Press start to begin the adaptation phase. The progress bar shows elapsed time and the label reports the current state.

State

idle

Step 2 · Advanced run controls

Top up, jump to test, or abort early

Once you understand the cycle, use these buttons to manage quick demonstrations: top up the adaptation, skip straight to the test, or halt the sequence.

Step 3 · Adapting stimulus

Pick the moving pattern that drives adaptation

Choose gratings, rotating dots, or expanding fields, then set motion strength, speed, and contrast. Fixation helps the effect accumulate.

Type

Direction

Adaptation time (s) 12

Speed (a.u.) 2.5

Spatial frequency (cycles) 12

Contrast 90%

Dot count (for dot fields) 800

Fixation cross

Step 4 · Test stimulus

Select the static pattern used for the aftereffect

Swap the stationary test between gratings, rings, noise, or blank mid-grey, and adjust its contrast. You can even show a faint test during adaptation.

Type

Test contrast 70%

Show during adaptation

Step 5 · Presets

Jump to lab-tested combinations

Use presets for quick demonstrations: classic waterfall, strong rotation, low contrast, and more.

Step 6 · Export & reset

Capture the current frame or restore defaults

Grab a PNG for lectures or reset everything before a new participant takes the test.