Abstract

Brightness scales for differing conditions of adaptation and contrast have been established by the combined procedures of ratio production and equal-brightness judgments under adapting conditions which differ systematically for the two eyes. Under stimulus conditions in which light adaptation alone is systematically varied, the equivalence of brightness ratios at differing levels of adaptation is demonstrated for a wide range of adapting luminances. Preliminary findings suggest that this equivalence also holds for chromatic adapting and test stimuli. Changes in the brightness of brief foveal stimuli due to light adaptation may be describable within the framework of a general power law, if all test-stimulus luminances are expressed as luminance above psychological zero brightness (that is, as luminance above threshold for each specific condition).

Changes in brightness due to light adaptation may be measured either by the use of a preadapting stimulus or by presentation of test stimuli on a prevailing surround. When adaptation is defined in terms of the production of a criterion luminance threshold, the adaptive effects of the two procedures may be shown to be equivalent.

© 1961 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Visual Responses to Equally Bright Stimuli of Unequal Luminance

Judith Wheeler Onley and Robert M. Boynton
J. Opt. Soc. Am. 52(8) 934-940 (1962)

Psychophysical Responses to Homochromatic Stimuli of Equal Brightness but Unequal Luminance*

Judith Wheeler Onley and Charles E. Sternheim
J. Opt. Soc. Am. 57(2) 258-267 (1967)

Brightness Function: Effects of Adaptation*

J. C. Stevens and S. S. Stevens
J. Opt. Soc. Am. 53(3) 375-385 (1963)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (10)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (2)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription