Alignment errors to both ends of acute- and obtuse-angle arms

Wenderoth, Peter; Beh, Helen C.; White, Dennis

doi:10.3758/bf03199522

Cited by 19 publications

(8 citation statements)

References 18 publications

Supporting

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“…Therefore, the two pairs, Figures The main outcome of this experiment is the resolution of an apparent inconsistency between the results reported by Day (1973) and Wenderoth et al (1978). The results confirm both sets of earlier findings and indicate that the differences are attributable to the particular figures used in the original experiments.…”

supporting

confidence: 79%

“…It was therefore concluded that the acute angles do not themselves contribute to the misalignment illusion. A more recent experiment by Wenderoth, Beh, and White (1978) did not support this conclusion. It was found that apparent misalignment between a dot and an oblique line forming the arm of a 45 0 acute angle was greater than that between the dot and the oblique line alone.…”

contrasting

confidence: 37%

“…It is more likely that the differences between the members of the two pairs of figures were involved. The figures used by Day (1973) are shown in Figures 2A and 2B and those used by Wenderoth et at. (1978) in Figures 2C and 2D.…”

mentioning

confidence: 99%

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Relative magnitude of apparent misalignment in acute-angle and oblique-line figures

Day

Dickinson

1979

Perception & Psychophysics

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supporting

confidence: 79%

contrasting

confidence: 37%

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Relative magnitude of apparent misalignment in acute-angle and oblique-line figures

Day

Dickinson

1979

Perception & Psychophysics

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“…forms of the figure (Imai, 1973;Judd, 1899;Krantz & Weintraub, 1973) when one of the oblique lines is replaced by a dot (Day & Dickinson, 1976;Tong & Weintraub, 1974;Wenderoth, Beh, & White, 1978), when both obliques are replaced by rows of dots (Coren, 1970;Predebon, 1983;Wenderoth & Wade, 1981), and when the parallels are replaced by inwardly curved lines (Velinsky, 1925) or parallel rows of small elements such as dots or dashed lines (Day, Dickinson, & Jory, 1977;Wenderoth & Wade, 1981).…”

Section: It Occurs In Various Incompletementioning

confidence: 99%

Apparent displacement of lines and dots in a parallel-line figure: A clue to the basis of the Poggendorff effect

Day

Kasperczyk

1985

Perception & Psychophysics

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Three experiments involving a parallel-line figure are reported. In the first and second experiments, the Tolansky version of the Poggendorff illusion, apparent inexact bisection of the space between two lines by a third line, was shown to occur with both dots and lines in combination and with three dots. The effect with three dots on the parallels was as great as that with three lines intersecting the parallels. In the third experiment, a variant of the conventional Poggendorff illusion, apparent misalignment of vertical collinear lines, was also shown to occur with dot-line combinations and dots and to be as great with two dots as with two lines. The occurrence of both versions ofthe illusion to the same degree with dots on the parallels as with lines intersecting them serves to rule out explanations of apparent displacement based on changes in the apparent orientation of lines and the apparent size of angles. The Poggendorff and Tolansky effects with only dots also raises questions about explanations couched in terms of depth processing. These questions are discussed and an alternative explanation in terms of a compromise between objective and figure-relative bisection and alignment is tentatively suggested.The original version of the Poggendorff illusion in which two collinear obliques separated by a pair ofparallels appear displaced from their physical alignment is shown in Figure 1A. The upper-right oblique appears to be too high on the right parallel to be aligned with the lower-left oblique on the left parallel. This effect has been variously attributed to optically induced distortion in the region of the intersections (Chiang, 1968;Glass, 1970

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“…The results have suggested that the effect is attributable to an increase in perceived size of the smaller angle and/or a decrease in perceived size of the larger angle (Helmholtz 1910(Helmholtz /1962Hotopf & Ollereamshaw, 1972;Imai, 1973), and/or to perceived rotation of the transversals toward perpendicular with respect to the parallels (Hotopf, Ollereamshaw, & Brown, 1974;Krantz & Weintraub, 1973;Weintraub & Krantz, 1971;Weintraub, Krantz, & Olson, 1980). However, the illusion still exists when presented with only dots instead of transversals (Coren, 1970;Day & Dickinson, 1976;Day & Kasperczyck, 1985;Predebon, 1983;Tong & Weintraub, 1974;Wenderoth, Beh, & White, 1978;Wenderoth & Wade, 1981), thus ruling out perceived angle size and rotation as comprehensive explanations.…”

mentioning

confidence: 99%

Spatial context affects the Poggendorff illusion

Spivey-Knowlton

Bridgeman

1993

Perception & Psychophysics

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The Poggendorffillusion has often been explained as purely an interaction between the parallels and the transversals. The present study demonstrates that additional spatial context exerts an influence on this illusion. In Experiment 1, we examined the effects of a surrounding tilted frame (complete and degraded versions) on collinearity adjustments in the upright and rotated Poggendorff figures. The frame's orientation was always oblique. Relative to the no-frame condition, frames decreased error in collinearity adjustments in the upright Poggendorff figure, and increased error in the rotated Poggendorff figure. In Experiment 2, a circumscribing circle did not cause an orientation-inhibition effect (Ebenholtz & Utrie, 1982, suggesting that the effect of the frame on the Poggendorff illusion may not be closely related to the rod-and-frame effect. In Experiment 3, orientation of a central texture modulated the magnitude of the illusion. The results do not serve to explain the mechanisms behind the Poggendorffillusion, but they do demonstrate the importance of visual reference frames in understanding perceived misalignment.

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Alignment errors to both ends of acute- and obtuse-angle arms

Cited by 19 publications

References 18 publications

Relative magnitude of apparent misalignment in acute-angle and oblique-line figures

Relative magnitude of apparent misalignment in acute-angle and oblique-line figures

Apparent displacement of lines and dots in a parallel-line figure: A clue to the basis of the Poggendorff effect

Spatial context affects the Poggendorff illusion

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