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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 41, Iss. 12 — Dec. 1, 1951
  • pp: 1010–1016

The Variation of Critical Fusion Frequency with Brightness at Various Retinal Locations

RICHARD THOMAS BROOKE  »View Author Affiliations


JOSA, Vol. 41, Issue 12, pp. 1010-1016 (1951)
http://dx.doi.org/10.1364/JOSA.41.001010


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Abstract

<p>The purpose of this experiment is to investigate the variation in critical fusion frequency with brightness for various positions in the test field.</p><p>Critical frequency curves for brightnesses between -3 and +3 log millilamberts were determined for a 2° test field of green light at the fovea and at 10°, 20°, 30°, and 40° in the periphery. The procedure used allowed an image of a 2-mm circular aperture to be focused in the plane of the pupil. Tests showed that astigmatism did not influence the data obtained for the peripheral stimuli.</p><p>The curve of log critical frequency against log brightness for foveal observation does not show an inflection in its rise to a maximum. The curves for peripheral observations rise to a plateau at low brightnesses, dip at medium to low brightnesses, and rise again to a maximum, thus giving the conventional “cone” curve at high brightnesses. The maximum is lower and lower for locations increasingly distant from the fovea.</p><p>Data on color thresholds indicate that rods probably make their contributions to the initial part of the “cone” branch.</p><p>Comparison of data for green and white central fields shows that these colors give data that superimpose for equivalent foveal stimulation. For peripheral stimulation a slight shift of the curve for green (with respect to the curve for white) seems to occur in the direction of lower brightnesses. The latter effect is interpreted to be a Purkinje shift.</p><p>The Purkinje shift is greatly emphasized when orange and green peripheral fields are used. Green light, matched foveally with orange light, is more effective than orange in providing peripheral flicker.</p><p>The data are interpreted to mean that rods function and interact with cones at levels of brightness that are often considered to be photopic.</p>

Citation
RICHARD THOMAS BROOKE, "The Variation of Critical Fusion Frequency with Brightness at Various Retinal Locations," J. Opt. Soc. Am. 41, 1010-1016 (1951)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-41-12-1010


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References

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  13. V. V. Lloyd, "A Comparison of Critical Fusion Frequencies for Different Areas in the Fovea and the Periphery" (unpublished doctoral dissertation, Columbia University, 1951).

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