Abstract

The dark adaptation of two subjects was measured following pre-exposures that changed from zero to maximum intensity and the reverse, from maximum to zero, as well as for equivalent unchanging pre-exposures. Three intensities and four durations of pre-exposure were investigated. The main effects found were between the two changing conditions: for most of these the zero to maximum intensity resulted in higher initial thresholds and longer times to reach the final dark-adapted threshold than the equivalent condition in which the pre-exposure was from maximum to zero.

© 1957 Optical Society of America

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References

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  1. K. J. W. Craik and M. D. Vernon, Brit. J. Psychol. 32, 62–81 (1941).
  2. E. Wolf and M. J. Zigler, J. Opt. Soc. Am. 44, 875–879 (1954).
    [CrossRef] [PubMed]

1954 (1)

1941 (1)

K. J. W. Craik and M. D. Vernon, Brit. J. Psychol. 32, 62–81 (1941).

Craik, K. J. W.

K. J. W. Craik and M. D. Vernon, Brit. J. Psychol. 32, 62–81 (1941).

Vernon, M. D.

K. J. W. Craik and M. D. Vernon, Brit. J. Psychol. 32, 62–81 (1941).

Wolf, E.

Zigler, M. J.

Brit. J. Psychol. (1)

K. J. W. Craik and M. D. Vernon, Brit. J. Psychol. 32, 62–81 (1941).

J. Opt. Soc. Am. (1)

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Figures (4)

Fig. 1
Fig. 1

Median photometer readings for the diaphragms used to provide continuously varying pre-exposure intensities. The curves show the intensity transmitted through the diaphragms at the various times during complete diaphragm excursions.

Fig. 2
Fig. 2

A comparison of dark-adaptation curves following unchanging pre-exposures with increasing and decreasing pre-exposures of the same durations and same maximum intensities.

Fig. 3
Fig. 3

Dark-adaptation curves following increasing and decreasing pre-exposures for various intensities and durations. In every pair the upper curve is for the increasing pre-exposure condition.

Fig. 4
Fig. 4

Dark-adaptation curves following increasing and decreasing pre-exposures for various intensities and durations. In every pair the upper curve is for the increasing pre-exposure condition.