space-threshold

Definitions

noun In psychophysics, the limen of dual impression for the skin or retina, as determined by the esthesiometric compasses or by the just noticeable separation of black dots on a white back-ground.

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It has been held that in order to be felt as two they must be far enough apart to have a spatial character, and hence the distance necessary for two points to be perceived has been called the 'space-threshold.'

Harvard Psychological Studies, Volume 1 Containing Sixteen Experimental Investigations from the Harvard Psychological Laboratory. Various 1889
The experiments are intended to have reference chiefly to three questions: the space-threshold, fusion of touch sensations, and the perception of number.

Harvard Psychological Studies, Volume 1 Containing Sixteen Experimental Investigations from the Harvard Psychological Laboratory. Various 1889