It was observed by chance that illusions in patterns consisting of criss-crossing lines, such as the Orbison and Hering illusions, are markedly reduced when the patterns are blurred. In the first of two experiments the reduction with blurring was confirmed for four patterns but failed to occur in patterns lacking criss-crossing lines. In the second experiment the reduction was shown to be due mainly to the reduced luminance contrast in blurred patterns, thus confirming earlier findings on the effect of contrast on this group of illusions. Theoretical implications are discussed.
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References
1.
BlakemoreCCarpenterR H SGeorgesonM A, 1970“Lateral inhibition between orientation detectors in the human visual system”Nature (London)22837–39.
2.
BlakemoreCTobinE A, 1972“Lateral inhibition between orientation detectors in the cat's visual cortex”Experimental Brain Research15439–440.
3.
CarpenterR H SBlakemoreC, 1973“Interactions between orientations in human vision”Experimental Brain Research18287–303.
4.
ChiangC, 1968“A new theory to explain geometrical illusions produced by crossing lines”Perception and Psychophysics3174–176.
5.
ChiangC, 1975“A theory of Poggendorff illusion”Japanese Psychological Research17(3) 111–118.
6.
CorenSWardL MPoracCFraserR, 1978“The effect of optical blur on visual-geometric illusions”Bulletin of the Psychonomic Society11(6) 390–392.
7.
DayR H, 1972“Visual spatial illusions: A general explanation”Science1751335–1340.
8.
FraserJ, 1908“A new visual illusion of direction”British Journal of Psychology2307–320.
9.
GibsonJ JRadnerN, 1937“Adaptation, after-effect and contrast in the perception of tilted lines: I. Quantitative studies”Journal of Experimental Psychology20453–467.
10.
GinsburgA P, 1971“Psychological correlates of a model of the human visual system” in Proceedings: 1971 National Aerospace Electronics Conference (NAECON) (Dayton, Ohio) pp 283–290.
11.
GinsburgA P, 1973“Pattern recognition techniques suggested from psychological correlates of a model of the human visual system” in Proceedings: 1973 National Aerospace Electronics Conference (NAECON) (Dayton, Ohio) pp 309–316.
12.
GlassL, 1970“Effect of blurring on perception of a simple geometric pattern”Nature (London)2281341–1342.
HessRNegishiKCreutzfeldtO, 1975“The horizontal spread of intracortical inhibition in the visual cortex”Experimental Brain Research22415–419.
15.
MaheuxMTownsendJ CGresockC J, 1960“Geometric factors in illusions of direction”American Journal of Psychology73535–543.
16.
MarshallA JDi LolloV, 1963“Hering's illusion with impoverishment of the stimulus in scotopic and photopic vision”American Journal of Psychology56644–652.
17.
O'TooleBWenderothP, 1977“The tilt illusion: Repulsion and attraction effects in the oblique meridian”Vision Research17367–374.
18.
OyamaT, 1975“Determinants of the Zöllner illusion”Psychological Research37261–280.
19.
RockI, 1975An Introduction to Perception (New York: Macmillan).
20.
RoseDBlakemoreC, 1974“An analysis of orientation specificity in the cat's visual cortex”Experimental Brain Research201–17.
21.
SutherlandN S, 1961“Figurai aftereffects and apparent size”Quarterly Journal of Experimental Psychology13222–228.
22.
WallaceG K, 1969“The critical distance of interaction in the Zöllner illusion”Perception and Psychophysics5261–264.
23.
WallaceG K, 1975“The effect of contrast on the Zöllner illusion”Vision Research15963–966.
24.
WardL MCorenS, 1976“The effect of optically induced blur on the Müller-Lyer illusion”Bulletin of the Psychonomic Society7483–484.
25.
WealeR A, 1978“Experiments on the Zöllner and related illusions”Vision Research18203–208.
26.
WertheimerM, 1954“The differential satiability of schizophrenic and normal subjects: A test of a deduction from the theory of figurai aftereffects”Journal of General Psychology51291–299.
27.
WickelgrenB G, 1965“Brightness contrast and length perception in the Müller—Lyer illusion”Vision Research5141–150.
28.
WinerB J, 1971Statistical Principles in Experimental Design (New York: McGraw-Hill).
