Master of Arts (MA)
First Committee Member
Number of Pages
Eighty-three college undergraduates estimated midpoints of vertical lines presented in cued (a letter or figure presented below the line), uncued, and inverted T conditions. Subject's mean estimates were near the geometric midpoint in the two cued conditions, and significantly above the midpoint in the uncued and inverted T conditions. Mean estimates in the inverted T conditions were significantly above those in the uncued condition. These displacements are discussed in relation to previous midpoint estimation findings and theoretical explanations of the vertical-horizontal illusion. The midpoint estimation task is evaluated as an investigative tool in studies of geometric-optical illusions, and recommendations for further study are suggested.
Applied; Estimation; Horizontal; Illusion; Midpoint; Vertical
Psychology, Experimental; Psychophysiology; Psychobiology
University of Nevada, Las Vegas
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Ogren, Gary Wayne, "Midpoint estimation applied to the vertical-horizontal illusion" (1999). UNLV Retrospective Theses & Dissertations. 1029.
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