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Data from five experiments consistently failed to support an explanation of the Poggendorif misalignment and misbisection effects in terms of underestimation of extent between parallel lines. Although underestimation of vertical extent between parallel lines was confirmed, the effects on it of the kind and number of elements on the parallels were opposite to their effects on apparent misalignment and misbisection. Furthermore, right-angle extent between oblique parallels was overestimated. When vertical extent between oblique parallels and oblique extent between vertical parallels (as in the conventional figure) ended in transversals, underestimation was eliminated. It is concluded that the illusions of extent and alignment (or bisection) are independent effects. Both are held to be due to a process of perceptual compromise.

No evidence for apparent extent between parallels as the basis of the Poggendorff effect