With the exception of very small angles (<15°) Heywood and Chessell found systematic misestimations of the baseline distances of angles. Here three experiments are reported two of which indicate that the baseline distances of a wide range of acute angles (<75°) are overestimated while the third confirms Heywood and Chessell's pattern of errors. The results are discussed with reference to a possible confounding present in the method used in the third experiment and, therefore, in the original Heywood and Chessell experiments.
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References
1.
BlakemoreC BCarpenterR H SGeorgesonM A, 1970“Lateral inhibition between orientation detectors in the human visual system”Nature (London)22837–39
2.
CarpenterR H SBlakemoreC B, 1973“Interactions between orientations in human vision”Experimental Brain Research18287–303
3.
DayR H, 1974“The Poggendorff illusion: Apparent displacement of the oblique lines”Australian Journal of Psychology2649–59
4.
DayR HDickinsonR G, 1976“Apparent lengths of the arms of acute and obtuse angles, and the components of the Müller-Lyer illusion”Australian Journal of Psychology28137–148
5.
HeywoodSChessellK, 1977“Expanding angles? Systematic distortions of space involving angular figures”Perception6571–582
6.
HowardI P, 1982Human Visual Orientation (New York: John Wiley)
7.
O'TooleBWenderothP, 1977“The tilt illusion: Repulsion and attraction effects in the oblique meridian”Vision Research17367–374
8.
OyamaT, 1977“Feature analysers, optical illusions, and figural aftereffects”Perception6401–406
9.
ParkerD M, 1974“Evidence for the inhibition hypothesis in expanded angle illusion”Nature (London)250265–266
10.
VirsuVTaskinenH, 1975“Central inhibitory interactions in human vision”Experimental Brain Research2365–74
11.
WenderothP, 1983“Identical stimuli are judged differently in the orientation and position domains”Perception & Psychophysics in press
12.
WenderothPParkinsonAWhiteD, 1979“A comparison of visual tilt illusions measured by the techniques of vertical setting, parallel matching, and dot alignment”Perception847–57
13.
WenderothPWhiteD, 1979“Angle-matching illusions and perceived line orientation”Perception8565–575
