The results of recent studies indicate that certain visuomotor actions, such as grasping and pointing, are unaffected by visual size illusions. The present study investigated whether the Poggendorff illusion of alignment influences pointing to a target's location. 15 subjects pointed with their unseen hands to the apparent location of the extension of the oblique line onto the target line of a version of the Poggendorff illusion. Analysis indicated the pointing action was influenced by the Poggendorff illusion. The implications of this finding for the claim that different cortical streams of visual processing subserve visuomotor actions and conscious visual perception are discussed.
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References
1.
AgliotiS.DeSouzaJ., & GoodaleM. (1995) Size-contrast illusions deceive the eye but not the hand. Current Biology, 5, 679–685.
2.
BeckettP. A. (1989) Illusion decrement and transfer of illusion decrement in real- and subjective-contour Poggendorff figures. Perception & Psychophysics, 45, 550–556.
3.
BrunoN. (2001) When does action resist visual illusions?Trends in Cognitive Sciences, 5, 379–382.
4.
DydeR. T., & MilnerA. D. (2002) Two illusions of perceived orientation: One fools all the people some of the time; the other fools all the people all of the time. Experimental Brain Research, 144, 518–527.
5.
GoodaleM. A., & MilnerA. D. (1992) Separate visual pathways for perception and action. Trends in Neuroscience, 15, 20–25.
6.
MackA.HeuerF.VillardiK., & ChambersD. (1985) The dissociation of position and extend in Mueller-Lyer figures. Perception & Psychophysics, 37, 335–344.
7.
PredebonJ. (1990) Illusion decrement and transfer of illusion decrement in obtuse- and acute-angle variants of the Poggendorff illusion. Perception & Psychophysics, 48, 467–476.
