A different kind of false perception caused by neural undersampling occurs when the pattern is moving.

A sinewave (solid line)drifting to the right is sampled by a regular sampling array. The frequency of this sinewave is 1.5 times the Nyquist limit determined by the sampling array, and therefore it is supra-Nyquist. The alias of this sinewave is a low frequency sinewave (dashed line) moving in the opposite direction.

This 1-dimensional case is an oversimplification of the true situation of 2-dimensional sampling of the retinal image shown next.

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WWWaveTM 1996
World Wide Web automated virtual environment TM 1996
Kevin Haggerty, Indiana University.

This slide show was automatically converted to web pages by the WWWave.