Cite as:
Fidopiastis C, Hoffman D D, Prophet W D, Singh M, 2000, "Constructing surfaces and contours in displays of color from motion: The role of nearest neighbors and maximal disks" Perception 29(5) 567 – 580
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Constructing surfaces and contours in displays of color from motion: The role of nearest neighbors and maximal disks

Cali Fidopiastis, Donald D Hoffman, William D Prophet, Manish Singh

Received 28 July 1998, in revised form 1 February 2000

Abstract. Color-from-motion displays consist of a sparse array of dots which never move but change color according to various algorithms. Yet such displays can trigger human vision to construct apparent motion of a subjective surface which is uniformly colored and bounded by a subjective contour. We show that the perceptual strength of this construction depends on the density and regularity of dot placement. We studied three objective measures of density and regularity: nearest-neighbor distance, mean of maximal disks, and variance of maximal disks. We found that nearest-neighbor mechanisms alone are inadequate to account for the perceptual strength of the subjective surfaces and contours. Mechanisms sensitive to areal gaps provide a more adequate account.

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