With fragmented object outlines, geometric extrapolation accuracy can be expected to be determined by the interaction between local fragment properties (absolute position, length, orientation, curvature) and Gestalt, configural, or nonaccidental properties between fragments (relative position or proximity, collinearity and curvilinearity, symmetry or parallelism, density, etc.). The observed patterns of horizontal connections between orientation-selective V1 and V2 neurons are consistent with the Gestalt laws of grouping (proximity, collinearity, and density [...]) that have all been shown to influence contour detection, grouping, completion, and identification of fragmented object outlines
(Sven Panis and Johan Wagemans - University of Leuven - Time-Course Contingencies in Perceptual Organization and Identification of Fragmented Object Outlines. Journal of Experimental Psychology: American Psychological Association, Human Perception and Performance, 2009, Vol. 35, No. 3, p. 663)