Multiple Object Tracking: Temporal frequency limits

Assess the maximum speed at which you can track the white objects below

.mov, vimeo, youtube

Instructions: Keep your eyes fixed on the white dot in the center. Keep your attention on the two initially-white patches as they move. At low speed, this should be trivially easy, but as the speed increases, it may become difficult. Still, you may be able to track both targets all the way to the maximum speed

Your speed limit will be slower when more objects occupy the ring:

.mov, youtube

Instructions: Keep your eyes fixed on the white dot in the center. Note the speed at which you can no longer track the initally-white patches. It should be slower than for the first movie.

The slower speed limit reflects the temporal frequency limit- tracking here is constrained by the frequency with which objects pass each location. With more objects in the ring, that frequency limit is reached at a slower speed.

Specifically, temporal frequency is the product of the speed and the number of objects. Our experiments found a limit of about 4 Hz for two targets.

A higher frequency limit for tracking only a single target

Here there is only one target (the initially white object in the outer ring). Your speed limit should be faster than in the previous movie with two targets.

.mov, vimeo, youtube

Your speed limit should be similar when tracking a single target in the inner ring rather than the outer ring. Our experiments show that there is little effect of eccentricity on the temporal frequency or speed limits when expressed in revolutions per second- despite the fact that the corresponding linear speed of more central rings is much slower.

.mov, vimeo, youtube