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Experiments in collaboration with P. Hammond have shown some degree of algebraic summation of gradients for simple cells, and also for those complex cells that respond poorly to random texture. The assumption does not however hold for another class of complex cells (ref. 11) which respond strongly to motion of textured fields that do not excite simple cells. Such complex cells may even respond better to a chessboard with edges parallel to their preferred axis than to one at 45°. Thus generalizations about the response characteristics of ‘striate complex cells’ cannot validly be made without specifying the subclass in question.
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For analogous arguments relative to the use of chessboards as visual stimuli in psychophysics see Dow Smith, F., Science 198, 207 (1977); Tyler, C.W., Science 198, 208 (1977).
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MacKay, D. Strife over visual cortical function. Nature 289, 117–118 (1981). https://doi.org/10.1038/289117a0
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DOI: https://doi.org/10.1038/289117a0
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