In this sampling theory of visual resolution, the neural sampling elements have receptive fields which are relatively small compared to their spacing so they don't overlap, with the net result that each of the neurons in the array are able to respond significantly to spatial frequency components of the retinal image which lie beyond the Nyquist frequency of the array.

The critical distinction between these two competing theories shows up in the aliasing zone the spatial frequencies which lies beyond the resolution limit. If undersampling limits resolution, then targets beyond the resolution limit will remain visible as aliases, whereas if filtering is the limiting factor, then targets beyond the resolution limit will be invisible.

In short, the valid application of sampling theory to the problem of understanding the anatomical and physiological basis of resolution topography in man depends critically upon proof that visual resolution is limited by neural undersampling throughout the visual field.

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