Subjects inspected either inverted-T or L figures for 5 min. and then shortened the extended vertical lines of inverted-T figures in an attempt to make the vertical line equal in length to the horizontal line. Those who inspected inverted-T figures were more accurate on initial trials than controls (who did not inspect figures), those who inspected L figures, or those who inspected inverted-T figures and made adjustments on the inspected figures. The results indicate that visual inspection alone can produce a decrease in the Horizontal-Vertical illusion and may account, in part, for changes in strategic factors which have been hypothesized to underlie illusion decrement.
Get full access to this article
View all access options for this article.
References
1.
BrosvicG. M., & CohenB. D. (1988) The horizontal-vertical illusion and knowledge of results. Perceptual and Motor Skills, 67, 463–469.
2.
CorenS., & GirgusJ. S. (1972) Illusion decrement in intersecting line figures. Psychonomic Science, 26, 108–110.
3.
CorenS.GirgusJ. S., & SchianoD. (1986) Is adaptation of orientation-specific cortical cells a plausible explanation of illusion decrement?Bulletin of the Psychonomic Society, 24, 207–210.
4.
CorenS., & HoenigP. (1972) Eye movements and decrement in the Oppel-Kundt illusion. Perception & Psychophysics, 12, 224–225.
5.
FingerF. W., & SpeltD. K. (1947) The illustration of the horizontal-vertical illusion. Journal of Experimental Psychology, 37, 243–250.
6.
GirgusJ. S.CorenS.DurantM., & PoracC. (1975) The assessment of components involved in illusion formation using a long-term decrement procedure. Perception & Psychophysics, 18, 144–148.
7.
GirgusJ. S.CorenS., & FraenkelR. (1975) Levels of perceptual processing in the development of the visual illusions. Developmental Psychology, 11, 268–273.
8.
KubiE., & SlotnickB. (1993) The horizontal-vertical illusion: transfer of illusion decrement. Perceptual and Motor Skills, 77, 339–347.
9.
KünnapasT. M. (1955) An analysis of the “vertical-horizontal illusion.”Journal of Experimental Psychology, 49, 134–140.
10.
McBrideS.RisserJ. M., & SlotnickB. M. (1987) The horizontal-vertical illusion: independence of line bisection and a comparison line. Perceptual and Motor Skills, 64, 943–948.
11.
Rowe-BoyerM. M., & BrosvicG. M. (1990) Procedure-specific estimates of the structural and strategic factors in the horizontal-vertical illusion. Perceptual and Motor Skills, 70, 571–576.
12.
SarrisV. (1984) On perceptual learning in geometric-optical illusions. Studia Psychologia, 28, 29–37.
13.
SchianoD. J., & JordanK. (1990) Mueller-Lyer decrement: practice or prolonged inspection?Perception, 19, 307–316.
