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  1. G. L. Walls, J. Opt. Soc. Am. 33, 487 (1943).
    [Crossref]
  2. See, for example, W. Uhthoff, Graefes Archiv. f. Ophthal. 32, Abt. 1, 171 (1886) and Graefes Archiv. f. Ophthal. 36, Abt. 1, 33 (1890); A. König, Sitz. d. Akad. d. Wiss. Berlin 8, 559 (1897); and more recently, S. Hecht, J. Gen. Physiol. 11, 255 (1928);R. J. Lythgoe, (1932); and S. Shlaer, J. Gen. Physiol. 21, 165 (1937).
    [Crossref]
  3. S. Hecht and E. U. Mintz, J. Gen. Physiol. 22, 593 (1939).
  4. S. Hecht, J. Gen. Physiol. 18, 767 (1935).
  5. C. H. Graham and E. H. Kemp, J. Gen. Physiol. 21, 635 (1938).
  6. See also, M. Keller, J. Exper. Psychol. 28, 407 (1941).
    [Crossref]
  7. In addition to the above, C. H. Graham and C. Cook, Am. J. Psychol. 49, 654 (1937).
    [Crossref]
  8. C. H. Graham, R. H. Brown, and F. A. Mote, J. Exper. Psychol. 24, 555 (1939); C. H. Graham and N. R. Bartlett, J. Exper. Psychol. 24, 574 (1939) and J. Exper. Psychol. 27, 149 (1940).
    [Crossref]
  9. P. W. Cobb, Am. J. Physiol. 36, 335 (1914); and J. Steinhardt, J. Gen. Physiol. 20, 185 (1936).
  10. R. H. Brown and J. I. Niven, J. Exper. Psychol. 34, (1944). The methods and results of the present paper are described in full detail in the doctoral dissertation, “The influence of stimulus duration upon the relation between visual resolution and illumination,” by J. I. Niven, on file in the Clark University Library.
    [Crossref]
  11. S. Shlaer, J. Gen. Physiol. 21, 165 (1937).
  12. We have derived by the method of averages from our data and Eq. (3) a value of 0.0670 for b and of 0.00906 for K. The theoretical curve drawn through the points of Fig. 2 is the equation α·τ=0.0670[1+1/(0.00906I)12]2.
  13. C. H. Graham and R. Margaria, Am. J. Physiol. 113, 299 (1935); and H. W. Karn, J. Gen. Psychol. 14, 360 (1936).
    [Crossref]

1944 (1)

R. H. Brown and J. I. Niven, J. Exper. Psychol. 34, (1944). The methods and results of the present paper are described in full detail in the doctoral dissertation, “The influence of stimulus duration upon the relation between visual resolution and illumination,” by J. I. Niven, on file in the Clark University Library.
[Crossref]

1943 (1)

1941 (1)

See also, M. Keller, J. Exper. Psychol. 28, 407 (1941).
[Crossref]

1939 (2)

C. H. Graham, R. H. Brown, and F. A. Mote, J. Exper. Psychol. 24, 555 (1939); C. H. Graham and N. R. Bartlett, J. Exper. Psychol. 24, 574 (1939) and J. Exper. Psychol. 27, 149 (1940).
[Crossref]

S. Hecht and E. U. Mintz, J. Gen. Physiol. 22, 593 (1939).

1938 (1)

C. H. Graham and E. H. Kemp, J. Gen. Physiol. 21, 635 (1938).

1937 (2)

In addition to the above, C. H. Graham and C. Cook, Am. J. Psychol. 49, 654 (1937).
[Crossref]

S. Shlaer, J. Gen. Physiol. 21, 165 (1937).

1935 (2)

C. H. Graham and R. Margaria, Am. J. Physiol. 113, 299 (1935); and H. W. Karn, J. Gen. Psychol. 14, 360 (1936).
[Crossref]

S. Hecht, J. Gen. Physiol. 18, 767 (1935).

1914 (1)

P. W. Cobb, Am. J. Physiol. 36, 335 (1914); and J. Steinhardt, J. Gen. Physiol. 20, 185 (1936).

1886 (1)

See, for example, W. Uhthoff, Graefes Archiv. f. Ophthal. 32, Abt. 1, 171 (1886) and Graefes Archiv. f. Ophthal. 36, Abt. 1, 33 (1890); A. König, Sitz. d. Akad. d. Wiss. Berlin 8, 559 (1897); and more recently, S. Hecht, J. Gen. Physiol. 11, 255 (1928);R. J. Lythgoe, (1932); and S. Shlaer, J. Gen. Physiol. 21, 165 (1937).
[Crossref]

Brown, R. H.

R. H. Brown and J. I. Niven, J. Exper. Psychol. 34, (1944). The methods and results of the present paper are described in full detail in the doctoral dissertation, “The influence of stimulus duration upon the relation between visual resolution and illumination,” by J. I. Niven, on file in the Clark University Library.
[Crossref]

C. H. Graham, R. H. Brown, and F. A. Mote, J. Exper. Psychol. 24, 555 (1939); C. H. Graham and N. R. Bartlett, J. Exper. Psychol. 24, 574 (1939) and J. Exper. Psychol. 27, 149 (1940).
[Crossref]

Cobb, P. W.

P. W. Cobb, Am. J. Physiol. 36, 335 (1914); and J. Steinhardt, J. Gen. Physiol. 20, 185 (1936).

Cook, C.

In addition to the above, C. H. Graham and C. Cook, Am. J. Psychol. 49, 654 (1937).
[Crossref]

Graham, C. H.

C. H. Graham, R. H. Brown, and F. A. Mote, J. Exper. Psychol. 24, 555 (1939); C. H. Graham and N. R. Bartlett, J. Exper. Psychol. 24, 574 (1939) and J. Exper. Psychol. 27, 149 (1940).
[Crossref]

C. H. Graham and E. H. Kemp, J. Gen. Physiol. 21, 635 (1938).

In addition to the above, C. H. Graham and C. Cook, Am. J. Psychol. 49, 654 (1937).
[Crossref]

C. H. Graham and R. Margaria, Am. J. Physiol. 113, 299 (1935); and H. W. Karn, J. Gen. Psychol. 14, 360 (1936).
[Crossref]

Hecht, S.

S. Hecht and E. U. Mintz, J. Gen. Physiol. 22, 593 (1939).

S. Hecht, J. Gen. Physiol. 18, 767 (1935).

Keller, M.

See also, M. Keller, J. Exper. Psychol. 28, 407 (1941).
[Crossref]

Kemp, E. H.

C. H. Graham and E. H. Kemp, J. Gen. Physiol. 21, 635 (1938).

Margaria, R.

C. H. Graham and R. Margaria, Am. J. Physiol. 113, 299 (1935); and H. W. Karn, J. Gen. Psychol. 14, 360 (1936).
[Crossref]

Mintz, E. U.

S. Hecht and E. U. Mintz, J. Gen. Physiol. 22, 593 (1939).

Mote, F. A.

C. H. Graham, R. H. Brown, and F. A. Mote, J. Exper. Psychol. 24, 555 (1939); C. H. Graham and N. R. Bartlett, J. Exper. Psychol. 24, 574 (1939) and J. Exper. Psychol. 27, 149 (1940).
[Crossref]

Niven, J. I.

R. H. Brown and J. I. Niven, J. Exper. Psychol. 34, (1944). The methods and results of the present paper are described in full detail in the doctoral dissertation, “The influence of stimulus duration upon the relation between visual resolution and illumination,” by J. I. Niven, on file in the Clark University Library.
[Crossref]

Shlaer, S.

S. Shlaer, J. Gen. Physiol. 21, 165 (1937).

Uhthoff, W.

See, for example, W. Uhthoff, Graefes Archiv. f. Ophthal. 32, Abt. 1, 171 (1886) and Graefes Archiv. f. Ophthal. 36, Abt. 1, 33 (1890); A. König, Sitz. d. Akad. d. Wiss. Berlin 8, 559 (1897); and more recently, S. Hecht, J. Gen. Physiol. 11, 255 (1928);R. J. Lythgoe, (1932); and S. Shlaer, J. Gen. Physiol. 21, 165 (1937).
[Crossref]

Walls, G. L.

Am. J. Physiol. (2)

P. W. Cobb, Am. J. Physiol. 36, 335 (1914); and J. Steinhardt, J. Gen. Physiol. 20, 185 (1936).

C. H. Graham and R. Margaria, Am. J. Physiol. 113, 299 (1935); and H. W. Karn, J. Gen. Psychol. 14, 360 (1936).
[Crossref]

Am. J. Psychol. (1)

In addition to the above, C. H. Graham and C. Cook, Am. J. Psychol. 49, 654 (1937).
[Crossref]

Graefes Archiv. f. Ophthal. (1)

See, for example, W. Uhthoff, Graefes Archiv. f. Ophthal. 32, Abt. 1, 171 (1886) and Graefes Archiv. f. Ophthal. 36, Abt. 1, 33 (1890); A. König, Sitz. d. Akad. d. Wiss. Berlin 8, 559 (1897); and more recently, S. Hecht, J. Gen. Physiol. 11, 255 (1928);R. J. Lythgoe, (1932); and S. Shlaer, J. Gen. Physiol. 21, 165 (1937).
[Crossref]

J. Exper. Psychol. (3)

C. H. Graham, R. H. Brown, and F. A. Mote, J. Exper. Psychol. 24, 555 (1939); C. H. Graham and N. R. Bartlett, J. Exper. Psychol. 24, 574 (1939) and J. Exper. Psychol. 27, 149 (1940).
[Crossref]

See also, M. Keller, J. Exper. Psychol. 28, 407 (1941).
[Crossref]

R. H. Brown and J. I. Niven, J. Exper. Psychol. 34, (1944). The methods and results of the present paper are described in full detail in the doctoral dissertation, “The influence of stimulus duration upon the relation between visual resolution and illumination,” by J. I. Niven, on file in the Clark University Library.
[Crossref]

J. Gen. Physiol. (4)

S. Shlaer, J. Gen. Physiol. 21, 165 (1937).

S. Hecht and E. U. Mintz, J. Gen. Physiol. 22, 593 (1939).

S. Hecht, J. Gen. Physiol. 18, 767 (1935).

C. H. Graham and E. H. Kemp, J. Gen. Physiol. 21, 635 (1938).

J. Opt. Soc. Am. (1)

Other (1)

We have derived by the method of averages from our data and Eq. (3) a value of 0.0670 for b and of 0.00906 for K. The theoretical curve drawn through the points of Fig. 2 is the equation α·τ=0.0670[1+1/(0.00906I)12]2.

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Figures (2)

Fig. 1
Fig. 1

The relation between logarithm of the visual angle in minutes subtended by the illuminated stimulus slit and logarithm of threshold intensity in millilamberts.

Fig. 2
Fig. 2

The relation between log α·τ and log I. The curve is theoretical and derived from Hecht’s theory of visual intensity discrimination.

Tables (1)

Tables Icon

Table I Logarithm of threshold intensity of resolution as a function of width and duration of an illuminated slit.

Equations (3)

Equations on this page are rendered with MathJax. Learn more.

( Δ I / I ) · τ = C [ 1 + 1 / ( K I ) 1 2 ] 2 ,
α = b · Δ I / I ,
α · τ = b [ 1 + 1 / ( K I ) 1 2 ] 2 ,