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By H. J. Eysenck (Eds.)

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Ixt. m Z) _l => 3 X ÜJ x s n50 1-55 1-60 LOG t' OF THE WHITE 1-65 1-70 STIMULUS FIG. 9. The critical duration of the white stimulus below which the Bidwell phenomenon can never occur, plotted against the product of the luminance and duration (ixt) of the white stimulus. A. 42 S. AIBA DISCUSSION The effect of the white stimulus as determined by the "threshold" luminance of the stimulus was what one be expects red from the Bunsen-Roscoe law. This law, which was originally formulated to explain a purely physicochemical phenomenon, was first applied to sensory data in the field of threshold measurements (Bloch, 1885; Hartline, 1934; Graham andMargaria, 1935, and Karn, 1936).

The solid curve in Fig. 7. is based on this assumption. As to the lower limit of the range, there were not enough higher luminances in this study to enable us to study much shorter durations. Previous studies do suggest, however, that the law holds for durations as short as, for example, 4·1~3 msec (Brindley, 1952) when tested with the apparent brightness of a white stimulus. There is no reason why this should not hold true in our present experimental set-up also. There is, however, an important proviso to the above statement arising from the fact that the phenomenon never occurs under certain values of ixt (however low the luminance of the red stimulus), if t becomes lower than certain critical values.

A. , except that they are displaced from the latter's position along the ordinates. , this displacement may be attributed either to the variation in the effective luminance of the white stimulus, or, equally likely, to the variation in the effective luminance of the red stimulus. It is unlikely, however, that it is due to any change in the effective duration of the white stimulus,for,in this case,curves would be displaced along the abscissa. There is still another possibility that the displacement is caused by the change in the effective duration of the red stimulus.

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