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.

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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).

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.

E. Wolf and M. J. Zigler, J. Opt. Soc. Am. 44, 875–879 (1954).

Zigler, M. J.

E. Wolf and M. J. Zigler, J. Opt. Soc. Am. 44, 875–879 (1954).

Other (2)

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

E. Wolf and M. J. Zigler, J. Opt. Soc. Am. 44, 875–879 (1954).

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