人間環境学研究
Online ISSN : 1883-7611
Print ISSN : 1348-5253
ISSN-L : 1348-5253
論文
文字探索課題における優位視野が選択的注意に及ぼす影響
吉崎 一人西村 律子津田 昌子藤田 知加子
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2007 年 5 巻 2 号 p. 2_27-2_34

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The aim of this study was to investigate the validity of Lavie's load theory (Lavie, 2005) from the point of view of cerebral lateralization. In Experiment 1, right-handed participants were asked to discriminate a target letter in a task-relevant letters-array which was presented at a left or right visual-field, while ignoring a letter (distractor) which was presented above or below a central fixation. We manipulated the perceptual load (high/low) of the task-relevant letter-arrays and the compatibility between a target and a distractor. The results showed that the compatibility effect was larger in the low load condition than in the high load condition irrespective of visual-field, which supported the load theory. The second experiment was the same as Experiment 1, except that a triangle, the high-load letter-array and the distractor were simultaneously presented. We set up two object conditions; within-object and across-object conditions. In the former condition, the letter-array and the distractor was presented within the triangle. In the latter, only the letter-array was presented within the triangle and the distractor was presented outside the triangle. The results showed that in the left visual-field condition, the compatibility effect was observed only in the within-object condition, not in the across-object condition, whereas in the right visual-field condition, it was observed in both the conditions. These results suggested that selective attention is modulated by cerebral dominance for letter search.

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© 2007 人間環境学研究会
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