This video shows movies of small and large moving objects. The first video frame contains instructions on how to adjust your viewing distance and/or video size for best results. Movies start short, just two video frames, and progressively increase up to 28 video frames. As the movie duration increases, motion direction will be easier and easier to see. Most people find that the motion direction of large moving objects is harder to see than the motion direction of small moving objects. This phenomenon, called spatial suppression, is stronger in high IQ individuals. In other words, high IQ individuals struggle at perceiving motion direction of large moving objects.

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