Abstract

The influence of intermittent pre-exposure upon subsequent dark adaptation was investigated for two intermittent conditions. In one condition the intensity was increased in the same proportion as the amount of light-time in the light-dark ratio was decreased, keeping duration constant. In the other, intensity was constant but the duration was extended to compensate for variations in light-time. Both conditions were compared with equivalent control pre-exposures to continuous light. The control intensities and durations were 140, 281, and 562 mL and 1 and 3 minutes. The rate of intermittence was 1 cycle/second, and four light-to-dark ratios were used. The curves of dark adaptation obtained after intermittent pre-exposures of constant duration but different intensities were almost identical with those after the equivalent control pre-exposure. This was not so for the intermittent pre-exposures of constant intensity but different durations; after the longer durations, dark adaptation was much slower than after the equivalent control condition.

© 1952 Optical Society of America

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References

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  1. F. A. Mote and A. J. Riopelle, J. Opt. Soc. Am. 41, 120 (1951).
    [CrossRef]
  2. F. A. Mote and Eleanor C. Reed, J. Opt. Soc. Am. 42, 333 (1952).
    [CrossRef] [PubMed]
  3. Mote, Riopelle, and Meyer, J. Opt. Soc. Am. 40, 585 (1950).
  4. F. A. Mote and A. J. Riopelle, J. Comp. and Physiol. Psychol. (to be published).
  5. G. Wald and A-B. Clark, J. Gen. Physiol. 21, 93 (1937).

1952 (1)

1951 (1)

1950 (1)

Mote, Riopelle, and Meyer, J. Opt. Soc. Am. 40, 585 (1950).

1937 (1)

G. Wald and A-B. Clark, J. Gen. Physiol. 21, 93 (1937).

Clark, A-B.

G. Wald and A-B. Clark, J. Gen. Physiol. 21, 93 (1937).

Meyer,

Mote, Riopelle, and Meyer, J. Opt. Soc. Am. 40, 585 (1950).

Mote,

Mote, Riopelle, and Meyer, J. Opt. Soc. Am. 40, 585 (1950).

Mote, F. A.

Reed, Eleanor C.

Riopelle,

Mote, Riopelle, and Meyer, J. Opt. Soc. Am. 40, 585 (1950).

Riopelle, A. J.

F. A. Mote and A. J. Riopelle, J. Opt. Soc. Am. 41, 120 (1951).
[CrossRef]

F. A. Mote and A. J. Riopelle, J. Comp. and Physiol. Psychol. (to be published).

Wald, G.

G. Wald and A-B. Clark, J. Gen. Physiol. 21, 93 (1937).

J. Gen. Physiol. (1)

G. Wald and A-B. Clark, J. Gen. Physiol. 21, 93 (1937).

J. Opt. Soc. Am. (3)

Other (1)

F. A. Mote and A. J. Riopelle, J. Comp. and Physiol. Psychol. (to be published).

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Figures (4)

Fig. 1
Fig. 1

Dark adaptation curves obtained following pre-exposure to continuous light of 562 mL and two conditions of intermittent pre-exposure equivalent to the continuous. Data are for subject E.C.R. In each set of three curves the solid line represents the data for the continuous pre-exposure.

Fig. 2
Fig. 2

Dark adaptation curves obtained following pre-exposure to continuous light of 140 mL and two conditions of intermittent pre-exposure equivalent to the continuous. Data are for subject F.A.M. In each set of three curves the solid line represents the data for the continuous pre-exposure.

Fig. 3
Fig. 3

Representative dark adaptation curves for subject F.A.M. In panel A are shown the four continuous control pre-exposure curves obtained following 562 mL for 3 min duration. Panel B shows the curves obtained following the four intermittent pre-exposure conditions of the same duration but different intensities which are equivalent to the continuous control procedure. Panel C shows the comparison of the means of the curves shown in panels A and B.

Fig. 4
Fig. 4

Representative data obtained from both subjects showing the effect of extending the durations of the intermittent pre-exposures upon subsequent dark adaptation. In each set of three curves the solid line represents the means of the four continuous control pre-exposures at the values of intensity and duration indicated on each panel of the figure. The retardation of dark adaptation following the 1 8 - 7 8 and 1 16 - 15 16 light-dark ratios is evident when these curves are compared with the course of dark adaptation after the continuous control and the 1 2 - 1 2 light-dark ratio conditions.