igoS ] 



OF SUBLIMINALLY COLORED STIMULI. 373 



two Stages, dark and light. The colored images, both of the regular 

 and of the control experiments, passed off as gray. 



Experiment III.: The Color Mixer with Unchanged Discs. — So 

 far we have followed and systematised Tschermak's method; the 

 amount of color in the stimulus has increased, during the single 

 observation, and has been compensated by a progressive adaptation. 

 In the present experiments the amount of color in the discs is in- 

 creased from subliminal to normally supraliminal, step by step, in 

 successive observations. 



The rotating discs were observed, as before, through a circular 

 opening in a black or neutral gray screen. The discs themselves 

 were made up of neutral gray (identical with that of the screen), 

 with a colored sector (Hering R, Y, G, B). The stimulus was 

 fixated for i min., and the after-image was projected upon a neutral 

 gray or black background. P, G and A'' served as regular observers : 

 a few observations were also taken from B and T. The following 

 are typical results. 



In the above observations, the black screen and the neutral gray back- 

 ground were employed. Other arrangements of screen and background gave 

 similar results. 



In no case was a colored after-image obtained from a sublimi- 

 nally colored stimulus. On the contrary, the image appeared only 

 when the stimulus-color was distinctly supraliminal. 



