The speaker is videotaped under high-quality fluorescent lighting (seen on left). The resultant videotapes will show only bright points moving against a black background. For this experiment, the speaker's face is filmed within a distractor frame made-up of additional point-lights. The purpose of the frame is to hide structural information about the speaker's identity and articulation. This technique forces observers to rely on the time-varying information available in the displays and makes it difficult for observers to perform accurate judgments with static point-light images.