Blur or degrading of the retinal image has been shown to be a factor in the formation of visual-geometric illusions where intersecting line elements are present. Light irises allow more scattered light within the eye, which results in more image degradation than found in dark-eyed subjects. Measurements on 755 observers show that illusion magnitude varies as a function of iris pigmentation for a configuration with intersecting line elements (Müller — Lyer illusion), but not for a configuration devoid of such features (Ebbinghaus illusion).
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References
1.
von BekeseyG, 1967Sensory Inhibition (Princeton, NJ: Princeton University Press)
2.
BerryJ W, 1966“Temne and Eskimo perceptual skills”International Journal of Psychology1207–229
3.
BurnsB DPritchardR, 1971“Geometrical illusions and the response of neurones in the cats visual cortex to angle patterns”Journal of Physiology (London)213399–616
4.
ChiangC, 1968“A new theory to explain geometrical illusions produced by crossing lines”Perception and Psychophysics3174–176
5.
CorenS, 1969“The influence of optical aberrations on the magnitude of the Poggendorff illusion”Perception and Psychophysics6185–186
6.
CorenS, 1970“Lateral inhibition and geometric illusions”Quarterly Journal of Experimental Psychology22274–278
7.
CorenSGirgusJ S, 1972“A comparison of five methods of illusion measurement”Behaviour Research Methods and Instrumentation4240–244
8.
CorenSGirgusJ S, 1973“Visual spatial illusions: Many explanations”Science179503–504
9.
CorenSGirgusJ S, 1974“Transfer of illusion decrement as a function of perceived similarity”Journal of Experimental Psychology102881–887
10.
CorenSGirgusJ S, in press “Visual illusions” in Handbook of Sensory Physiologyvolume VIIIPerception Eds HeldRLeibowitzH WTeuberH L (New York: Springer)
11.
CorenSGirgusJ SErlichmanHHakstianA R, 1976“An empirical taxonomy of visual illusions”Perception and Psychophysics20129–137
12.
CorenSMillerJ, 1974“Size contrast as a function of figurai similarity”Perception and Psychophysics16355–357
13.
CorenSWardL MPoracCFraserR, 1978“Optical factors in the formation of visual — geometric illusions”Bulletin of the Psychonomic Society11390–392
14.
DeregowskiJ B, 1973“Illusion and culture” in Illusion in Nature and Art Eds GregoryR LGombrichE H (New York: Charles Scribner's Sons) pp 161–192
15.
GanzL, 1966“Mechanism of the figurai aftereffects”Psychological Review73128–150
16.
GirgusJ SCorenS, 1973“Peripheral and central components in formation of visual illusions”American Journal of Optometry and the Archives of the American Academy of Optometry50533–580
17.
GirgusJ SCorenSAgdernM, 1972“The inter-relationship between the Ebbinghaus and the Delboeuf illusions”Journal of Experimental Psychology95453–455
18.
GirgusJ SCorenSDurantMPoracC, 1975“The assessment of components involved in illusion formation using a long term decrement procedure”Perception and Psychophysics18144–148
19.
LeibowitzH WPickH A, 1972“Cross-cultural and educational aspects of the Ponzo perspective illusion”Perception and Psychophysics12130–132
20.
MassaroD WAndersonN H, 1971“Judgmental model of the Ebbinghaus illusion”Journal of Experimental Psychology81147–151
21.
MorganC L, 1894An Introduction to Comparative Psychology (London)
22.
PollackR HSilvarS D, 1967a“Magnitude of the Müller-Lyer illusion in children as a function of pigmentattion of the fundus oculi”Psychonomic Science883–84
23.
PollackR HSilvarS D, 1967b“Racial differences in the pigmentation of the fundus oculi”Psychonomic Science7159–160
24.
PolyakS, 1957The Vertebrate Visual System (Chicago, 111.: University of Chicago Press)
25.
RestleF, 1971“Visual illusion”in Adaptation Level Theory Ed. ApleyM H (New York: Academic Press)
26.
RestleFMerrymanC T, 1968“An adaptation-level theory account of a relative size illusion”Psychonomic Science12229–230
27.
SegaliM HCampbellD THerskovitsM J, 1966The Influence of Culture on Visual Perception (Indianapolis, Ind.: Bobbs-Merrill)
28.
WallsG L, 1967The Vertebrate Eye and its Adaptive Radiation (Hafner: New York)
29.
WardL MCorenS, 1976“The effect of optically-induced blur on the magnitude of the Müller-Lyer illusion”Bulletin of the Psychonomic Society7483–484
