Abstract

With sinusoidal modulation of the radiance of the stimulus as a function of time, <i>amplitude</i> thresholds are measured instead of the repetition-rate thresholds usually obtained in flicker-fusion experiments. Controlling the modulation amplitude independently of the time-average radiance provides an additional degree of freedom, so that the observer's adaptation level can be held constant while his amplitude sensitivity is measured as a function of the modulation frequency. With an "edgeless" flickering field, these amplitude sensitivity curves show a broad peak of maximum visual response, in the region from 10 to 20 cps at high photopic levels. Such classic relationships as the Ferry-Porter, Talbot-Plateau, and Weber-Fechner laws are derivable from the present results, as descriptions of the behavior of certain parts of the amplitude sensitivity curves as functions of adaptation level.

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  1. H. E. Ives, J. Opt. Soc. Am. 6, 254 (1922); ibid, 343 (1922).
  2. H. de Lange, Physica 18, 935 (1952).
  3. H. de Lange, thesis, Technical University, Delft, Holland (1957).
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  5. R. C. Jones, J. Wash. Acad. Sci. 47, 100 (1957).
  6. F. Veringa, J. Opt. Soc. Am. 48, 500 (1958).
  7. L. H. Van der Tweel (private communication).
  8. J. Levinson, Science 130, 919 (1959).
  9. J. Levinson, Science 131, 1438 (1960).
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  11. D. H. Kelly, J. Opt. Soc. Am. 49, 730 (1959).
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  17. L. Stark and T. N. Cornsweet, Science 127, 588 (1958).
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  20. L. A. Riggs, J. C. Armington and F. Ratliff, J. Opt. Soc. Am. 44, 315 (1954).
  21. F. Ratliff and L. A. Riggs, J. Exptl. Psychol. 40, 687 (1950).
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  23. E. M. Lowry, J. Soc. Motion Picture and Television Engrs. 57, 187 (1951).
  24. W. Crozier and E. Wolf, J. Gen. Physiol. 24. 635 (1940โ€“1941).

Crozier, W.

W. Crozier and E. Wolf, J. Gen. Physiol. 24. 635 (1940โ€“1941).

de Lange, H.

H. de Lange, thesis, Technical University, Delft, Holland (1957).

H. de Lange, Physica 18, 935 (1952).

H. de Lange, J. Opt. Soc. Am. 48, 777 (1958).

Forsyth, D. M.

D. M. Forsyth, J. Opt. Soc. Am. 50, 337 (1960).

Ives, H. E.

H. E. Ives, J. Opt. Soc. Am. 6, 254 (1922); ibid, 343 (1922).

Jones, R. C.

R. C. Jones, J. Wash. Acad. Sci. 47, 100 (1957).

Kelly, D. H.

D. H. Kelly, J. Opt. Soc. Am. 49, 730 (1959).

D. H. Kelly, J. Opt. Soc. Am. 50, 1115 (1960).

D. H. Kelly, Rev. Sci. Instr. 32, 50 (1961).

D. H. Kelly, dissertation, University of California, Los Angeles, California (1960).

Krauskopf, J.

J. Krauskopf, J. Opt. Soc. Am. 47, 740 (1957).

Levinson, J.

J. Levinson, Science 130, 919 (1959).

J. Levinson, Science 131, 1438 (1960).

Lowry, E. M.

E. M. Lowry, J. Soc. Motion Picture and Television Engrs. 57, 187 (1951).

Ratliff, F.

F. Ratliff and L. A. Riggs, J. Exptl. Psychol. 40, 687 (1950).

F. Ratliff and H. K. Hartline, J. Gen. Physiol. 42, 1241 (1959); see also H. K. Hartline, Revs. Modern Phys. 31, 515 (1959).

Riggs, L. A.

L. A. Riggs, F. Ratliff, J. C. Cornsweet, and T. N. Cornsweet, J. Opt. Soc. Am. 43, 495 (1953).

L. A. Riggs, J. C. Armington and F. Ratliff, J. Opt. Soc. Am. 44, 315 (1954).

Ronchi, L.

L. Ronchi and G. T. di Francia, J. Opt. Soc. Am. 47, 639 (1957). See also A. Fiorentini, Atti Fond. Ronchi 10, 54 (1955).

Stark, L.

L. Stark and T. N. Cornsweet, Science 127, 588 (1958).

Van der Tweel, L. H.

L. H. Van der Tweel, thesis, University of Amsterdam, The Netherlands (1956).

L. H. Van der Tweel (private communication).

Veringa, F.

F. Veringa, J. Opt. Soc. Am. 48, 500 (1958).

Other

H. E. Ives, J. Opt. Soc. Am. 6, 254 (1922); ibid, 343 (1922).

H. de Lange, Physica 18, 935 (1952).

H. de Lange, thesis, Technical University, Delft, Holland (1957).

H. de Lange, J. Opt. Soc. Am. 48, 777 (1958).

R. C. Jones, J. Wash. Acad. Sci. 47, 100 (1957).

F. Veringa, J. Opt. Soc. Am. 48, 500 (1958).

L. H. Van der Tweel (private communication).

J. Levinson, Science 130, 919 (1959).

J. Levinson, Science 131, 1438 (1960).

D. M. Forsyth, J. Opt. Soc. Am. 50, 337 (1960).

D. H. Kelly, J. Opt. Soc. Am. 49, 730 (1959).

D. H. Kelly, dissertation, University of California, Los Angeles, California (1960).

D. H. Kelly, J. Opt. Soc. Am. 50, 1115 (1960).

L. Ronchi and G. T. di Francia, J. Opt. Soc. Am. 47, 639 (1957). See also A. Fiorentini, Atti Fond. Ronchi 10, 54 (1955).

D. H. Kelly, Rev. Sci. Instr. 32, 50 (1961).

L. H. Van der Tweel, thesis, University of Amsterdam, The Netherlands (1956).

L. Stark and T. N. Cornsweet, Science 127, 588 (1958).

L. A. Riggs, F. Ratliff, J. C. Cornsweet, and T. N. Cornsweet, J. Opt. Soc. Am. 43, 495 (1953).

F. Ratliff and H. K. Hartline, J. Gen. Physiol. 42, 1241 (1959); see also H. K. Hartline, Revs. Modern Phys. 31, 515 (1959).

L. A. Riggs, J. C. Armington and F. Ratliff, J. Opt. Soc. Am. 44, 315 (1954).

F. Ratliff and L. A. Riggs, J. Exptl. Psychol. 40, 687 (1950).

J. Krauskopf, J. Opt. Soc. Am. 47, 740 (1957).

E. M. Lowry, J. Soc. Motion Picture and Television Engrs. 57, 187 (1951).

W. Crozier and E. Wolf, J. Gen. Physiol. 24. 635 (1940โ€“1941).

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