The perceived field corresponding to a physically homogeneous, intermittently luminous area under certain conditions exhibits patterns that have no spatial correlates in the stimulus. These subjective patterns are compared quantitatively under monocular and binocular stimulus conditions by determining the minimum luminance necessary for their emergence at various intermittency frequencies. It is found that one type of pattern, relatively ill defined and irregular, differs little for the two conditions, whereas another kind of pattern, quite geometrical and of more distinct definition, has a much lower threshold binocularly than monocularly. This is thought to be evidence that the former kind of pattern originates below, and the latter kind at or above, the level of binocular interaction.
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