拡大・縮小手がかりの組み合わせが輻輳・開散眼球運動に与える影響

概要

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Periodical expansion/contraction of stimulus induces vergence responses. In this study, we examined whether stimulus expansion/contraction without observer's prediction based on periodical expansion/contraction will generate vergence responses. In Experiment 1, we used Maltese cross and checked pattern as stimulus (the size: 11.6 and 2.0 as diagonals). The result showed that expansion of the lager stimulus elicited convergence responses (2 observers out of five with Maltese cross; 3 out of five with checked pattern) while contraction of the larger stimulus and expansion/contraction of the smaller stimulus did not elicit vergence responses. In Experiment 2, we used checked pattern as stimulus. The results showed that larger range of expansion in area and texture of stimulus (up to 20 deg) elicited convergence (four observers out of five), and its contraction (down to 2 deg) elicited divergence responses (three out of five), while expansion in texture without changing the stimulus area elicited smaller convergence response than expansion in texture and the area. Moreover, contraction in texture without changing the stimulus area did not elicited divergence response. We concluded that: (a) expansion elicited larger vergence response than contraction, and (b) vergence response increases with combination of texture and the area to be changed.
日本基礎心理学会の論文
2006-09-30