Abstract

The perceived brightnesses of the maxima and minima in spatial sinusoidal light variations have been determined by suprathreshold psychophysical techniques in the photopic region. For example, the response/ stimulus contrast ratio at 20 cd/m<sup>2</sup> average luminance and spatial frequencies between 1.5 to 7.5 lines/deg is 2.4 to 3.4 for 25% and 1.8 to 2.0 for 50% object contrast. Contrast transfer has a pronounced peak at about 5.5 lines/deg for all object contrasts. The visual system is nonlinear and a contrast transfer function does not exist in the photopic region. The measurements have been performed under normal viewing conditions where both successive and simultaneous contrast phenomena are operative.

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Barlow, H. B.

H. B. Barlow, J. Physiol. 119, 69 (1953).

Bryngdahl, O.

O. Bryngdahl, J. Opt. Soc. Am. 54, 1152 (1964).

O. Bryngdahl, Naturwiss. 51, 177 (1964).

O. Bryngdahl, Kybernetik 2, 227 (1965).

Campbell, F. W.

F. W. Campbell and D. G. Green, Nature 208, 191 (1965).

F. W. Campbell and J. G. Robson, J. Opt. Soc. Am. 54, 581 (1964).

D. G. Green and F. W. Campbell, J. Opt. Soc. Am. 55, 1154 (1965).

Cornsweet, T. N.

M. Davidson and T. N. Cornsweet, J. Opt. Soc. Am. 54, 580 (1964).

Davidson, M.

M. Davidson and T. N. Cornsweet, J. Opt. Soc. Am. 54, 580 (1964).

DePalma, J. J.

J. J. DePalma and E. M. Lowry, J. Opt. Soc. Am. 52, 328 (1962).

Ditchburn, R. W.

R. W. Ditchburn, D. H. Fender, and S. Mayne, J. Physiol. 145, 98 (1959).

R. W. Ditchburn, Opt. Acta 1, 171 (1955).

Doughty, G. F.

G. F. Doughty, R. L. Porteous, and F. J. B. Wall, J. Phot. Sco. 12, 214 (1964).

Fender, D. H.

R. W. Ditchburn, D. H. Fender, and S. Mayne, J. Physiol. 145, 98 (1959).

Green, D. G.

F. W. Campbell and D. G. Green, Nature 208, 191 (1965).

D. G. Green and F. W. Campbell, J. Opt. Soc. Am. 55, 1154 (1965).

Hartline, H. K.

H. K. Hartline, Am. J. Physiol. 130, 690 (1940).

Hiwatashi, K.

K. Hiwatashi, A. Watanabe, T. Mori, and S. Nagata, Tech. J. Japan Broadcasting Corp. 16, 38 (1964).

Kuffler, S. W.

S. W. Kuffler, J. Neurophysiol. 16, 37 (1953).

Lowry, E. M.

J. J. DePalma and E. M. Lowry, J. Opt. Soc. Am. 52, 328 (1962).

Mayne, S.

R. W. Ditchburn, D. H. Fender, and S. Mayne, J. Physiol. 145, 98 (1959).

Menzel, E.

E. Menzel, J. Proske, and H. D. Wallheinke, Optik 23, 169 (1965).

Mori, T.

K. Hiwatashi, A. Watanabe, T. Mori, and S. Nagata, Tech. J. Japan Broadcasting Corp. 16, 38 (1964).

Nagata, S.

K. Hiwatashi, A. Watanabe, T. Mori, and S. Nagata, Tech. J. Japan Broadcasting Corp. 16, 38 (1964).

Porteous, R. L.

G. F. Doughty, R. L. Porteous, and F. J. B. Wall, J. Phot. Sco. 12, 214 (1964).

Proske, J.

E. Menzel, J. Proske, and H. D. Wallheinke, Optik 23, 169 (1965).

Robson, J. G.

F. W. Campbell and J. G. Robson, J. Opt. Soc. Am. 54, 581 (1964).

Wall, F. J. B.

G. F. Doughty, R. L. Porteous, and F. J. B. Wall, J. Phot. Sco. 12, 214 (1964).

Wallheinke, H. D.

E. Menzel, J. Proske, and H. D. Wallheinke, Optik 23, 169 (1965).

Watanabe, A.

K. Hiwatashi, A. Watanabe, T. Mori, and S. Nagata, Tech. J. Japan Broadcasting Corp. 16, 38 (1964).

Other (16)

H. K. Hartline, Am. J. Physiol. 130, 690 (1940).

S. W. Kuffler, J. Neurophysiol. 16, 37 (1953).

H. B. Barlow, J. Physiol. 119, 69 (1953).

R. W. Ditchburn, D. H. Fender, and S. Mayne, J. Physiol. 145, 98 (1959).

R. W. Ditchburn, Opt. Acta 1, 171 (1955).

O. Bryngdahl, Naturwiss. 51, 177 (1964).

O. Bryngdahl, J. Opt. Soc. Am. 54, 1152 (1964).

O. Bryngdahl, Kybernetik 2, 227 (1965).

J. J. DePalma and E. M. Lowry, J. Opt. Soc. Am. 52, 328 (1962).

K. Hiwatashi, A. Watanabe, T. Mori, and S. Nagata, Tech. J. Japan Broadcasting Corp. 16, 38 (1964).

M. Davidson and T. N. Cornsweet, J. Opt. Soc. Am. 54, 580 (1964).

F. W. Campbell and J. G. Robson, J. Opt. Soc. Am. 54, 581 (1964).

G. F. Doughty, R. L. Porteous, and F. J. B. Wall, J. Phot. Sco. 12, 214 (1964).

D. G. Green and F. W. Campbell, J. Opt. Soc. Am. 55, 1154 (1965).

F. W. Campbell and D. G. Green, Nature 208, 191 (1965).

E. Menzel, J. Proske, and H. D. Wallheinke, Optik 23, 169 (1965).

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