scholarly journals Inconstancy and Inconsistency of Visual Illusory Phenomena? The Case of the Poggendorff Figure

Psychology ◽  
2012 ◽  
Vol 03 (03) ◽  
pp. 257-264 ◽  
Author(s):  
Alberto Gallace ◽  
Marialuisa Martelli ◽  
Roberta Daini
Keyword(s):  
Poggendorff Figure

Are the Obtuse Angles the Key Components of the Poggendorff Illusion?

Perception ◽  
1981 ◽  
Vol 10 (2) ◽  
pp. 165-172 ◽  
Author(s):  
Peter Wenderoth ◽  
Michael Johnson
Keyword(s):  
Poggendorff Illusion ◽  
Acute Angle ◽  
Obtuse Angle ◽  
Negative Effects ◽  
Linear Summation ◽  
Displacement Effect ◽  
Positive Effects ◽  
Poggendorff Figure

An experiment is reported which confirms and extends a previous finding that amputations of the Poggendorff figure do not necessarily result in large positive effects with obtuse-angle stimuli, and small or even negative effects with acute-angle stimuli. Indeed, the acute-angle effects found were significantly greater than the obtuse-angle effects, and the full Poggendorff error was not explicable in terms of the linear summation of the component-angle effects. An ‘alignment displacement effect’ reported earlier by Hotopf and Obonai was shown to occur, but could not be an important component of the Poggendorff illusion.

The Oblique Line Illusion: The Poggendorff Effect without Parallels

1973 ◽  
Vol 25 (4) ◽  
pp. 535-541 ◽  
Author(s):  
R. H. Day
Keyword(s):  
Oblique Line ◽  
Median Plane ◽  
Poggendorff Figure ◽  
Poggendorff Effect

The apparent misalignment of two oblique collinear lines was investigated in two experiments. In the first the effect with the lines at 45° to the median plane was compared with that for the same two lines separated by the conventional parallels of the Poggendorff figure. The illusion with the two lines was consistent and significant but about one-third the magnitude of that with the parallels. The two illusions were significantly correlated. In the second experiment the angle of the two oblique, collinear lines was varied in 15° steps. The misalignment illusion was maximal at 45° and smaller but significant at 60 and 75°. There was no significant effect at 15 and 30°.

Binocular Displacement of Unpaired Region

Perception ◽  
1994 ◽  
Vol 23 (9) ◽  
pp. 1025-1036 ◽  
Author(s):  
Hiroshige Takeichi ◽  
Hitoshi Nakazawa
Keyword(s):  
Poggendorff Illusion ◽  
Previous Experiment ◽  
Binocular Disparity ◽  
Lateral Displacement ◽  
Spatial Layout ◽  
Visual Direction ◽  
Depth Discontinuity ◽  
Paired Stimuli ◽  
Poggendorff Figure ◽  
Unpaired Region

Binocular displacement of binocularly unpaired parts of the stimulus was examined by means of the Poggendorff figure. The Poggendorff figure can be used to investigate displacement since lateral displacement of the transversal may cause bias in judgments of its collinearity. In experiment 1, the transversal had a disparity, and thus binocularly unpaired parts, relative to the rectangle. The magnitude of the Poggendorff illusion should not have changed by addition of binocular disparity if displacement occurred. There was no or slight change when the transversal was seen behind the rectangle, but there was significant decrease when the transversal was seen in front of the rectangle, suggesting absence of displacement in this case. There were two possible explanations. One was that displacement depended on the positional relation between the unpaired stimuli and the binocularly presented rectangle, ie the occlusion constraint, which the case with the transversal in front did not satisfy. The alternative was that the decrease was due to the perceived front depth of the transversal, and not related to binocular displacement at all. In order to discriminate between these two possibilities, the transversal was reduced to only the unpaired parts, resulting in dichoptic stimulation in experiment 2. In this stimulus, the positional relation between the unpaired and the paired stimuli was the same as in the previous experiment, yet no front depth could be perceived. The results showed similar asymmetry as in experiment 1. Thus we conclude that binocular displacement depends on the positional relation between the unpaired and the paired stimuli, regardless of their perceived depth. This may imply that binocular displacement is not symmetric about the sign of disparity, hence that it is not just averaging but is a reconstruction of the spatial layout of objects in the outside world to keep the visual direction of the unsuppressed unpaired region veridical by using explicit cues to depth discontinuity.

scholarly journals Bending the parallels of the Poggendorff figure

1980 ◽  
Vol 16 (1) ◽  
pp. 1-4 ◽  
Author(s):  
Mitchell Brigell ◽  
John Uhlarik
Keyword(s):  
Poggendorff Figure

The Role of Angles in Inducing Misalignment in the Poggendorff Figure

1989 ◽  
Vol 41 (2) ◽  
pp. 355-383 ◽  
Author(s):  
W. H. N. Hotopf ◽  
M. C. Hibberd
Keyword(s):  
Experimental Evidence ◽  
Poggendorff Illusion ◽  
Apparent Size ◽  
Poggendorff Figure

Much experimental evidence has been put forward against the idea that angles are necessary for the occurrence of the Poggendorff illusion. We show that five separate alignment illusions can be demonstrated in the Poggendorff figure according to its orientation, length of the parallels, and so on. In one of these (angle-caused misalignment) angles are a necessary component. The main source of the belief that angles are not necessary is the alignment illusion (attraction-caused misalignment), which is due to the action of the distant parallel on the transversal that does not abut it. We show finally that it is unlikely that the angle-caused misalignment illusion is due to a change in the apparent size of the angle.

A Variation of the Poggendorff Illusion

1969 ◽  
Vol 28 (3) ◽  
pp. 883-886 ◽  
Author(s):  
A. W. Pressey ◽  
O. Sweeney
Keyword(s):  
Poggendorff Illusion ◽  
Poggendorff Figure

A variation of the Poggendorff illusion in which there were no closed angles was found to correlate highly with the classical Poggendorff figure. In addition, repeated trials had a similar effect on both illusions. It was concluded that explanations of the Poggendorff illusion which focus on the presence of closed acute angles are probably incorrect.

scholarly journals Saccades to Explicit and Virtual Features in the Poggendorff Figure Show Perceptual Biases

i-Perception ◽  
2017 ◽  
Vol 8 (2) ◽  
pp. 204166951769922 ◽  
Author(s):  
Barbara Dillenburger ◽  
Michael Morgan
Keyword(s):  
Poggendorff Figure

scholarly journals Rapid eye movements to a virtual target are biased by illusory context in the Poggendorff figure

2015 ◽  
Vol 233 (7) ◽  
pp. 1993-2000 ◽  
Author(s):  
D. Melmoth ◽  
S. Grant ◽  
J. A. Solomon ◽  
M. J. Morgan
Keyword(s):  
Eye Movements ◽  
Rapid Eye Movements ◽  
Poggendorff Figure ◽  
Virtual Target

Recognition Processes and Occurrence of the Dot Poggendorff Illusion

1983 ◽  
Vol 56 (2) ◽  
pp. 471-474 ◽  
Author(s):  
John Predebon
Keyword(s):  
Poggendorff Illusion ◽  
Poggendorff Figure

The occurrence of the dot Poggendorff illusion was assessed in two groups of naive subjects ( N = 48). One group was given information on the line Poggendorff figure while a second group was not. The line Poggendorff illusion was assessed in a third group of 24 subjects. The experiment is presented in the context of the proposal that recognition of the line Poggendorff figure in the dot-figure can be a factor determining the occurrence of the dot Poggendorff illusion.

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