When a uniform field is intermittently illuminated, it will often appear to contain various geometric patterns. The present study deals with the threshold luminance at which such spurious patterns appear and with the dependence of this threshold upon the frequency of intermittency and upon the wavelength of the stimulus. The log threshold luminance increases roughly linearly with the frequency of intermittency over the major part of the frequency range tested. The threshold is affected by stimulus wavelength; blue or green require higher luminances than yellow or red. However, these differences of threshold vary with frequency of intermittency and reach maxima at approximately 14 cps. The wavelength effects are modified by chromatic preadaptation.
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