This study investigated how the parameters of the power function of line judgments by 68 college undergraduates were affected by orientation of line. Exponents of the power functions did not vary as a function of orientation, but the scaling factors varied substantially. These results suggest that the horizontal-vertical illusion is best described as about a 12% illusion. Also, results are inconsistent with the hypothesis that the horizontal-vertical illusion affects the exponent of power functions for judgments of area and volume.
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References
1.
AnastasiA.The estimation of area. Journal of General Psychology, 1936, 14, 201–225.
2.
BairdJ. C.Psychophysical analysis of visual space. Oxford: Pergamon, 1970.
3.
BairdJ. C., & NomaE.Fundamentals of scaling and psychophysics. New York: Wiley, 1978.
4.
ButlerD. L.Influence of line context on power function parameters. Perceptual and Motor Skills, 1983, 57, 67–70.
5.
FraymanB. J., & DawsonW. E.The effect of object shape and mode of presentation on judgments of apparent volume. Perception and Psychophysics, 1981, 29, 56–62.
6.
RobinsonJ. O.The psychology of visual illusions. London: Hutchinson, 1972.
7.
StanekR. J.Surface and volume judgments of three-dimensional shapes. Psychonomic Science, 1968, 11, 121–122.
