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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 66, Iss. 2 — Feb. 1, 1976
  • pp: 131–138

Monkey contrast threshold for aperiodic patterns

Thomas H. Harding and J. Terry Yates  »View Author Affiliations

JOSA, Vol. 66, Issue 2, pp. 131-138 (1976)

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A monkey’s and a human subject’s threshold responses were measured for single- and double-bar patterns of high spatial frequency. The observed values were compared to predicted values which were derived from each subject’s contrast sensitivity function. A theoretical peak-to-trough threshold mechanism was assumed in the calculations. The threshold predictions, which are couched in the assumption that the spatial visual system is linear near its threshold, were found to be close to observed values. The results are interpreted to suggest that the monkey visual system analyzes spatial information in qualitatively and quantitatively similar ways to human, and that a linear theory may be used for analyses of primate vision.

© 1976 Optical Society of America

Thomas H. Harding and J. Terry Yates, "Monkey contrast threshold for aperiodic patterns," J. Opt. Soc. Am. 66, 131-138 (1976)

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  24. In order to fit the single-bar data, Campbell et al. (Ref. 6) needed to shift their predictions along the spatial frequency axis, and to scale the magnitudes on the sensitivity axis. The scale factor a in Eq. (8) was chosen to provide the best fit to the single-bar data.
  25. The scale factor a in Eq. (8) was chosen to provide the best fit to the single-bar data. No shift of the prediction along the spatial frequency axis was required.

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