著者

小原 宏基 川合 悟

出版者

日本基礎心理学会

雑誌

基礎心理学研究 (ISSN:02877651)

巻号頁・発行日

vol.38, no.2, pp.214-226, 2020-03-31 (Released:2020-06-09)

参考文献数

106

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Despite numerous Vertical–Horizontal Illusion (VHI) studies conducted since that of Adolf Fick in 1851, VHI has yet to attain a uniformly accepted consensus due to conflicting conclusions. As a result, a re-examination of VHI was undertaken focusing on contact position of a vertical (mast) line on a horizontal (base) line, orientation of the VHI stimulus, and viewing conditions, i.e., monocular vs. binocular-vision. In pseudorandom fashion on a computer, 35 adults adjusted mast lines of varying length and contact position in reference to a 50-mm base line to the same perceived length as the base line. The Point of Subjective Equality (PSE) was measured over 168 trials (two trials of 7 contact positions×4 orientations×3 viewing conditions). Perceived lengths were significantly affected by contact position in an M-shaped manner (Marma et al., 2015) rather than V-shaped (Künnapas, 1955a), and PSE was shorter when the baseline was horizontal rather than vertical, confirming the anisotropy in vertical–horizontal axis (Künnapas, 1955a).