Divid G. Stork

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We derive visual temporal impulse response functions from the large-field sinusoidal flicker sensitivity measurements made at several luminances by Kelly [J. Opt. Soc. Am. 51, 422 (1961)]. To this end we recognize response function causality and use Kramers-Krönig relations to reconstruct the (unmeasured) temporal phase spectrum and hence also the impulse(More)
Several recent theoretical models for human spatial vision posit that cortical receptive fields act to minimize simultaneously the product of the standard deviation of the sensitivities to position (delta chi) and to spatial frequency (delta omega) in accord with the uncertainty principle from Fourier analysis. The receptive-field functions resulting from(More)
  • D. G. Stork
  • International 1989 Joint Conference on Neural…
  • 1989
The author searches for neurobiologically plausible implementations of the backpropagation gradient descent algorithm. Any such implementation must be consistent with physical constraints such as locality (i.e., that the behavior of any component can be influenced solely by components in physical contact with it) and contingent facts of biology, and must(More)
Contrast-sensitivity functions (CSF's) for converging and diverging gratings were obtained under voluntary fixation at several field widths and under retinal stabilization at one field width. In general, these types of gratings had similar CSF's at all temporal frequencies tested, a result that can be explained by plausible spatiotemporal receptive-field(More)
Data classification has been studied widely in the field of Artificial Intelligence, Machine Learning, data mining, and pattern recognition. Up to the present, the development of classification has made great achievements, and many kinds of classified technology and theory will continue to emerge. The aim of this paper is two fold. First, we present the(More)
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