Abstract

Changes of brightness sensation (fading) that occur when images are stabilized on the retina were measured with a matching technique. Increment thresholds were measured under the same conditions. Under stabilization, the increment threshold is proportional to stimulus level (Weber’s law). Increment thresholds change at a different rate than does brightness; this suggests that these mechanisms behave independently.

© 1969 Optical Society of America

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References

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  1. R. W. Ditchburn and B. L. Ginsborg, Nature 170, 36 (1952).
    [Crossref] [PubMed]
  2. L. A. Riggs, F. Ratliff, J. C. Cornsweet, and T. N. Cornsweet, J. Opt. Soc. Am. 43, 495 (1953).
    [Crossref] [PubMed]
  3. H. B. Barlow, Quart. J. Expl. Psychol. 15, 36 (1963).
    [Crossref]
  4. H. B. Barlow and J. M. B. Sparrock, Science 144, 1309 (1964).
    [Crossref] [PubMed]
  5. H. D. Faker, J. Opt. Soc. Am. 53, 98 (1963).
    [Crossref]

1964 (1)

H. B. Barlow and J. M. B. Sparrock, Science 144, 1309 (1964).
[Crossref] [PubMed]

1963 (2)

H. B. Barlow, Quart. J. Expl. Psychol. 15, 36 (1963).
[Crossref]

H. D. Faker, J. Opt. Soc. Am. 53, 98 (1963).
[Crossref]

1953 (1)

1952 (1)

R. W. Ditchburn and B. L. Ginsborg, Nature 170, 36 (1952).
[Crossref] [PubMed]

Barlow, H. B.

H. B. Barlow and J. M. B. Sparrock, Science 144, 1309 (1964).
[Crossref] [PubMed]

H. B. Barlow, Quart. J. Expl. Psychol. 15, 36 (1963).
[Crossref]

Cornsweet, J. C.

Cornsweet, T. N.

Ditchburn, R. W.

R. W. Ditchburn and B. L. Ginsborg, Nature 170, 36 (1952).
[Crossref] [PubMed]

Faker, H. D.

Ginsborg, B. L.

R. W. Ditchburn and B. L. Ginsborg, Nature 170, 36 (1952).
[Crossref] [PubMed]

Ratliff, F.

Riggs, L. A.

Sparrock, J. M. B.

H. B. Barlow and J. M. B. Sparrock, Science 144, 1309 (1964).
[Crossref] [PubMed]

J. Opt. Soc. Am. (2)

Nature (1)

R. W. Ditchburn and B. L. Ginsborg, Nature 170, 36 (1952).
[Crossref] [PubMed]

Quart. J. Expl. Psychol. (1)

H. B. Barlow, Quart. J. Expl. Psychol. 15, 36 (1963).
[Crossref]

Science (1)

H. B. Barlow and J. M. B. Sparrock, Science 144, 1309 (1964).
[Crossref] [PubMed]

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Figures (3)

Fig. 1
Fig. 1

Outline of apparatus used for matching two stabilized images. S1 and S2 are 8-V, 50-W projector lamps operated at controlled voltages; A, B, photometric neutral wedges. Light illuminating the opal screen is seen through the hole in the test object. The light illuminating the annulus was flashed by means of a sectored wheel (not shown) inserted in beam A. Increment thresholds were determined by tilting mirror M and directing all the light in beam A onto the opal screen.

Fig. 2
Fig. 2

Increment thresholds under stabilized (filled circles) and unstabilized (open circles) conditions. There is no measurable difference between the two sets of points, which fall on a straight line of almost unit slope. Subject J.M.S.

Fig. 3
Fig. 3

Comparison of changes of increment thresholds (open triangles) with changes of apparent brightness (open and filled circles) at various times following illumination of the center. In each case the left-hand ordinate refers to the matching illumination of the annulus and the right-hand ordinate refers to the log threshold. Especially at the lower luminances, the curves indicate that threshold changes are not closely associated with changes of apparent brightness. Subject J.M.S.