Ramp aftereffect

 

ramp

 

Warning: this is a subtle effect.

 

Gaze for at least 10s at the fixation cross in the neighbouring dynamic image. This will adapt your eyes to a brightening patch (above) and a repetitively dimming patch (below). Then move the mouse over the panel to turn it into a steady gray. You should see an aftereffect of apparent dimming (above) and apparent brightening (below). Move the mouse away to re-adapt.

 

This demonstrates the existence of transient visual pathways selective for gradual changes of luminance.

 

Source

 

Steward Anstis’s Demos. Reproduced with kind permission.

 

*This demo requires that looping of GIF animations is enabled.

 

 

Created: 1999-10-28

Last update: 2013-10-04