Measurement of the texture-coherence limit for bandpass arrays.
Casual observation suggests that when the elements of a visual array are packed at a sufficiently high density they cohere to generate the percept of a texture. This 'texture-coherence limit' has been quantified by using arrays composed of Gabor functions, sixth Gaussian derivatives, or differences of Gaussians. In all cases the texture-coherence limit was a power-law function of the size of the elements as quantified by their space constants with an exponent averaging 0.7. Furthermore, the texture-coherence limit was independent of both element spatial frequency and contrast over a considerable range. A quantitative fit to the data is provided by a model in which the texture-coherence limit is determined by activation of complex cells, which pool a spatial range of subunit inputs, throughout the stimulus region. Possible extensions to two dimensions are considered.
Wilkinson
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Department of Psychology, McGill University, Montreal, Quebec, Canada. fran@hebb.psych.mcgill.ca
Wilson
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D005260:Female; D006801:Humans; D008029:Lighting; D008959:Models, Neurological; D010364:Pattern Recognition, Visual; D010775:Photic Stimulation / Q000379:methods; D014794:Visual Fields