Perception demos
Small experiments and illusions to try on yourself or run in a classroom. They run in any modern browser, on laptops and phones, and send no data anywhere.
Experiment · 3 min
Same or different?
Match letters by shape and by name, and measure how long your brain needs to retrieve a letter's name.
Posner & Mitchell (1967)
IllusionWhere is the flash?
A flash aligned with a moving bar seems to lag behind it, unless the bar stops.
Nijhawan (1994)
Demo · needs a blue filterA blind spot for blue
See the blue-blind spot in the centre of your eye, and watch the brain carry a moving dot into it.
Shi & Nijhawan (2012)
Classroom toolA single glance
Flash your own photographs for 80 ms with a mask. What do people see before they can move their eyes?
Davenport & Potter (2004)