Letter | Published:

Statistical Detection Theory of Piper's Law

Naturevolume 212pages324326 (1966) | Download Citation



FOR both incremental and absolute visual thresholds the relationship between the threshold (ΔI) and the area of a stimulus (A) can be fitted fairly adequately to the equation : for conditions when1–3 : (a) the duration of the test flash is short ; (b) the test flash falls on a relatively uniform region of the retina ; (c) A is not too small and not too large.

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  1. 1

    Barlow, H. B., J. Physiol., 141, 337 (1958).

  2. 2

    Gregory, R. L., “Vision as an Information Source and Noisy Channel”. Third London Symp. on Information Theory, 1956.

  3. 3

    Piper, H., Z. Psychol. Physiol. Sinnesorg, 32 (1903).

  4. 4

    Green, D. M., J. Acoutt. Soc. Amer., 32, 1189 (1960).

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  1. Department of Psychology, University of Nottingham

    • C. I. HOWARTH
    •  & G. LOWE


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