Abstract

We have measured the sensitivity of the visual system to temporal modulation with unpredictable, aperiodic signals. We used three kinds of stimulation, (i) a band-limited gaussian random signal, (ii) a passband-limited gaussian random signal, (iii) a periodically quenched random signal. The sensitivity to stimulation with random signals can be predicted from the sensitivity of the visual system to periodic temporal signals. The sensitivity to random signals with narrow frequency bands at high frequencies is governed by the pseudoflash phenomenon. If the bandwidth is such that the signal contains less than two independent samples per second, the psychometric curve follows from the amplitude distribution of the random signal. If the signal contains a larger number of independent samples per second, the psychometric curves are as steep as they are for sine-wave stimulation. If the De Lange characteristic is the envelope of the sensitivity characteristics of independent channels, sensitive to specific frequency bands, then these experiments permit us to estimate the bandwidth of the most-sensitive channel.

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  1. C. Blakemore and F. W. Campbell, J. Physiol. (Lond.) 203, 237 (1969).
  2. R. A. Smith, Jr., Vision Res. 10, 275 (1970).
  3. R. A. Smith, Jr., J. Physiol. (Lond.) 216, 531 (1971).
  4. A. Pantle, Vision Res. 11, 943 (1971).
  5. D. H. Kelly, J. Opt. Soc. Am. 52, 89 (1962).
  6. D. G. Green, Vision Res. 9, 591 (1969).
  7. G. A. Korn, Random-Process Simulation and Measurements (McGraw-Hill, New York, 1966).
  8. By a random telegraph wave we mean an analog signal that can take on only two separate values and that switches back and forth between these two values at random moments of time.
  9. J. Levinson, Science 160, 21 (1968).
  10. J. A. Decker, Jr., Appl. Opt. 9, 1392 (1970).
  11. H. F. Harmuth, Transmission of Information by Orthogonal Functions (Springer, Berlin, 1970).
  12. H. L. van Trees, Detection, Estimation, and Modulation Theory, Part I (Wiley, New York, 1968), p. 197.

Blakemore, C.

C. Blakemore and F. W. Campbell, J. Physiol. (Lond.) 203, 237 (1969).

Campbell, F. W.

C. Blakemore and F. W. Campbell, J. Physiol. (Lond.) 203, 237 (1969).

Decker, Jr., J. A.

J. A. Decker, Jr., Appl. Opt. 9, 1392 (1970).

Green, D. G.

D. G. Green, Vision Res. 9, 591 (1969).

Harmuth, H. F.

H. F. Harmuth, Transmission of Information by Orthogonal Functions (Springer, Berlin, 1970).

Kelly, D. H.

D. H. Kelly, J. Opt. Soc. Am. 52, 89 (1962).

Korn, G. A.

G. A. Korn, Random-Process Simulation and Measurements (McGraw-Hill, New York, 1966).

Levinson, J.

J. Levinson, Science 160, 21 (1968).

Pantle, A.

A. Pantle, Vision Res. 11, 943 (1971).

Smith, Jr., R. A.

R. A. Smith, Jr., Vision Res. 10, 275 (1970).

R. A. Smith, Jr., J. Physiol. (Lond.) 216, 531 (1971).

van Trees, H. L.

H. L. van Trees, Detection, Estimation, and Modulation Theory, Part I (Wiley, New York, 1968), p. 197.

Other (12)

C. Blakemore and F. W. Campbell, J. Physiol. (Lond.) 203, 237 (1969).

R. A. Smith, Jr., Vision Res. 10, 275 (1970).

R. A. Smith, Jr., J. Physiol. (Lond.) 216, 531 (1971).

A. Pantle, Vision Res. 11, 943 (1971).

D. H. Kelly, J. Opt. Soc. Am. 52, 89 (1962).

D. G. Green, Vision Res. 9, 591 (1969).

G. A. Korn, Random-Process Simulation and Measurements (McGraw-Hill, New York, 1966).

By a random telegraph wave we mean an analog signal that can take on only two separate values and that switches back and forth between these two values at random moments of time.

J. Levinson, Science 160, 21 (1968).

J. A. Decker, Jr., Appl. Opt. 9, 1392 (1970).

H. F. Harmuth, Transmission of Information by Orthogonal Functions (Springer, Berlin, 1970).

H. L. van Trees, Detection, Estimation, and Modulation Theory, Part I (Wiley, New York, 1968), p. 197.

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