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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 1, Iss. 2 — Feb. 1, 1984
  • pp: 226–232

Orientation bandwidths of spatial mechanisms measured by masking

Gregory C. Phillips and Hugh R. Wilson  »View Author Affiliations


JOSA A, Vol. 1, Issue 2, pp. 226-232 (1984)
http://dx.doi.org/10.1364/JOSAA.1.000226


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Abstract

Orientation tuning curves were measured at 10 spatial frequencies ranging from 0.5 to 11.3 cycles per degree (cpd) using a masking paradigm. The stimuli were spatially localized test patterns of 1.0 octave bandwidth superimposed upon cosine grating masks. By using a model that corrects for the nonlinearity inherent in the masking process, we obtain the half-amplitude half-bandwidths (θ1/2) of Cartesian-separable receptive fields that may underlie orientation selectivity. Additional experiments show that the data are not compatible with separability in polar coordinates (spatial frequency and orientation). The orientation half-bandwidths have been found to decrease somewhat with increasing spatial frequency, going from about 30° at 0.5 cpd to 15° at 11.3 cpd, for both sustained and transient forms of temporal modulation. Similar bandwidths are obtained from data where the test is oriented along 45°. These bandwidth estimates are shown to be consistent with subthreshold summation data as well as physiological data from monkey striate cortex.

© 1984 Optical Society of America

History
Original Manuscript: March 24, 1983
Manuscript Accepted: October 10, 1983
Published: February 1, 1984

Citation
Gregory C. Phillips and Hugh R. Wilson, "Orientation bandwidths of spatial mechanisms measured by masking," J. Opt. Soc. Am. A 1, 226-232 (1984)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-1-2-226

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