False Phi Demos

You'll need a recent version of Chrome (recommended), Firefox or Safari, or at least version 9 of Internet Explorer. As these demos are rather computer-intensive, it may be a good idea to close as many other windows and browser tabs as practical.

Scroll down in each demo for an explanation.

1. Basic demo
2. Transient duration
3. Transient type
4. Spatial frequency
5. Spatial frequency, part 2
6. Inducer duration
7. Apparent motion
8. Inducer speed
9. Second-order motion
10. Real steps
11. Comparison with reverse phi
12. Sine-wave gratings
13. Ghost phi
14. Another example of ghost phi