scholarly journals Modifications of the Poggendorff effect as a function of random dot textures between the verticals

1994 ◽  
Vol 55 (5) ◽  
pp. 505-512 ◽  
Author(s):  
Roberto Masini ◽  
Tommaso Costa ◽  
Mario Ferraro ◽  
Angelo De Marco
Keyword(s):  
Poggendorff Effect

The Optical-Geometrical Illusion “Corner Poggendorff” Re-Examined

1993 ◽  
Vol 76 (3_suppl) ◽  
pp. 1283-1286 ◽  
Author(s):  
Giovanni Bruno Vicario ◽  
Elena Zambianchi
Keyword(s):  
The Other ◽  
Geometrical Illusion ◽  
Parallel Path ◽  
Poggendorff Effect ◽  
General Conditions

In 1988 Greene noted, if a straight pair of obliques are drawn outside of two orthogonal lines, the segments appear to be angled slightly one relative to the other. This illusion, designated as “corner Poggendorff,” is different from the Poggendorff effect (the two obliques seem to lie on a parallel path). The results of the present experiments ( N = 76 students) suggest that the general conditions for the corner Poggendorff are similar to those for the Judd illusion.

Angular Induction as a Function of Contact and Target Orientation

Perception ◽  
1989 ◽  
Vol 18 (2) ◽  
pp. 143-154 ◽  
Author(s):  
Ernest Greene ◽  
George Pavlov
Keyword(s):  
Angular Size ◽  
Target Orientation ◽  
Underlying Process ◽  
Parallel Lines ◽  
Projection Bias ◽  
Poggendorff Effect ◽  
Induction Line

The Poggendorff effect is seen as misalignment of two obliques, or misprojection of one, when the obliques are placed outside a set of parallel lines. To understand better the mechanisms behind this effect, the orientation of the lines which are normally parallel was systematically manipulated. The results indicate that projection bias is affected by the orientation of either line, is at a minimum where the line is orthogonal to the oblique, and is maximal at small angles. This is in line with classic theories which attribute the illusion to misperception of angular size. However, such explanations presuppose that in order to be effective the induction line must be proximal to the oblique so that an angle can be formed. Results are reported which show that the angle formed by the oblique and a line placed at a distance from the oblique, serving as the target of the projection, follows an angular rule of effectiveness similar to what is seen when the line is placed directly in contact with the oblique. The underlying process is described as ‘angular induction’.

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

1987 ◽  
Vol 42 (6) ◽  
pp. 561-568 ◽  
Author(s):  
R. H. Day ◽  
W. J. Jolly ◽  
F. M. Duffy
Keyword(s):  
Poggendorff Effect

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°.

scholarly journals Examination of apparent extent as an explanation of the Poggendorff effect

1989 ◽  
Vol 45 (6) ◽  
pp. 494-500 ◽  
Author(s):  
M. T. Trueman ◽  
A. E. Wilson
Keyword(s):  
Poggendorff Effect

The Relative Contribution of Contact and Target Lines in the Magnitude of the Poggendorff Effect

Perception ◽  
1987 ◽  
Vol 16 (3) ◽  
pp. 385-388 ◽  
Author(s):  
Ernest Greene
Keyword(s):  
Relative Contribution ◽  
Parallel Lines ◽  
Poggendorff Effect ◽  
Projection Error

It is well known that a set of parallel lines can cause misperception of the projected path of an oblique. Most studies of this effect have emphasized either the proximal or the distal stimulus components—the line with which the oblique makes contact, or the line that serves as the target of the projection. An experiment is reported in which the relative contribution of the contact and target lines was examined. The results indicate that rotation of either line can determine the magnitude of the projection error.

scholarly journals The basis of the Poggendorff effect: An additional clue for Day and Kasperczyk

1986 ◽  
Vol 39 (6) ◽  
pp. 447-448 ◽  
Author(s):  
Suzanne Greist-Bousquet ◽  
H. R. Schiffman
Keyword(s):  
Poggendorff Effect
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