Kubovy Perception Lab

Reducing Human Motion to Point-Light Video

Single dots recorded from key joint locations are capable of accurately conveying biological motion. (Johansson, 1973).  Consequently, we created psuedo point-light abstractions of the original gestures to allow for further testing of this illusion.  These animations represented only the mallet head, hand, elbow, and shoulder, and were capable of accurately reproducing the original illusion.

A graphic demonstration of how the point light videos were created:

Here are compressed versions of the point light stimuli:

Original gesture
Motion path identical to that in original videos
No Horizontal gesture
Contains only the vertical component of the original gestures


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