Abstract

The temporal course of reduction of test-stimulus effectiveness under conditions of metacontrast was studied with two different suprathreshold brightness-matching procedures. (1) Test-stimulus luminance was varied to make apparent brightness of the test stimulus equal to the brightness of a constant-luminance reference stimulus. (2) Reference-stimulus luminance was varied to match the apparent brightness of a test stimulus maintained at constant luminance. Functions obtained from two observers when the test-stimulus luminance was varied were typical metacontrast functions with maximum reduction of test-stimulus effectiveness when the test stimulus preceded the background by 50 ms, and the shape of the functions was highly similar to functions obtained previously with a disk–ring stimulus configuration. Functions obtained by varying reference-stimulus luminance were highly variable both between observers and within observers. The difficulties encountered with this second method probably resulted from glare from high-luminance test and surround fields.

© 1971 Optical Society of America

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References

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  1. M. Alpern, J. Opt. Soc. Am. 43, 648 (1953).
    [Crossref] [PubMed]
  2. P. Schiller and M. Smith, J. Exptl. Psychol. 71, 32 (1966).
    [Crossref]
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    [Crossref] [PubMed]
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    [Crossref]
  5. N. Weisstein, Psychol. Rev. 75, 494 (1968).
    [Crossref] [PubMed]

1969 (1)

1968 (2)

T. N. Cornsweet, Am. J. Psychol. 75, 485 (1968).
[Crossref]

N. Weisstein, Psychol. Rev. 75, 494 (1968).
[Crossref] [PubMed]

1966 (1)

P. Schiller and M. Smith, J. Exptl. Psychol. 71, 32 (1966).
[Crossref]

1953 (1)

Alpern, M.

Cornsweet, T. N.

T. N. Cornsweet, Am. J. Psychol. 75, 485 (1968).
[Crossref]

Matteson, H. H.

Schiller, P.

P. Schiller and M. Smith, J. Exptl. Psychol. 71, 32 (1966).
[Crossref]

Smith, M.

P. Schiller and M. Smith, J. Exptl. Psychol. 71, 32 (1966).
[Crossref]

Weisstein, N.

N. Weisstein, Psychol. Rev. 75, 494 (1968).
[Crossref] [PubMed]

Am. J. Psychol. (1)

T. N. Cornsweet, Am. J. Psychol. 75, 485 (1968).
[Crossref]

J. Exptl. Psychol. (1)

P. Schiller and M. Smith, J. Exptl. Psychol. 71, 32 (1966).
[Crossref]

J. Opt. Soc. Am. (2)

Psychol. Rev. (1)

N. Weisstein, Psychol. Rev. 75, 494 (1968).
[Crossref] [PubMed]

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Figures (2)

F. 1
F. 1

Stimulus configuration.

F. 2
F. 2

Test-stimulus retinal illuminance needed to maintain constant test-stimulus brightness (top) and reference-stimulus retinal illuminance needed to match test-stimulus brightness (bottom) as a function of stimulus-onset asynchrony for JL (left) and TF (right). Circles indicate mean values, and the end of the half-brackets indicates the first replication value. Brackets were omitted when range between replications was less than 0.3 log. Filled circles indicate measures obtained with the surround present. Open circles (labeled N) indicate control observations made with no surround field.