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The hypothesis that the right ear advantage for dichotically presented verbal materials might be interpreted in terms of cerebral hemisphere asymmetry has been strongly supported by the fact that high... right ear scores were obtained by the split-brain patients and hemispherectomized subjects. It is questionable, however, whether the right ear advantage in dichotic listening is determined by hemispheric asymmetry alone, because there are large individual differences in ear advantage, and the ear difference score fluctuate in successive trials of a single listener. The present study investigated the individual differences and the reliability of ear advantage by analyzing the relationship between the order of response and ear preference, between-individual variations and within-individual fluctuations of ear advantage. Twenty listeners received two sessions of 12 dichotic listening run of 30 pairs of natural stop consonant-vowel syllables per run in a two-response paradigm. Pearson's r between sessions was .710. The average ear-advantage for each of the listeners among 24 listening runs varied from -12.8 to 15.8%, and the mean for group was 6.0% with a standard deviation of 7.9. The standard deviations for each of the listeners ranged between 8.1 and 18.7%. The latter values were larger than that of the between-individual variability. The reversals in direction of the ear advantage across listening runs were observed very often, and even the listeners who showed significant ear advantage reversed their directions more than once. The distribution of the ear advantages, pooled from all subjects, was represented approximately as a normal curve, and that across 60 subjects in the second experiment was so. Thus, an observed ear advantage could arise from a true ear advantage and other various factors, but it seemed to be difficult to separate a true ear advantage from such factors as attentional biases, response strategies, or proclivities of the subject. We concluded that the ear advantage in dichotic listening task was not reliable for the purpose of making inferences about the hemispheric dominance.show more
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聴覚における知覚的非対称性と半球非対称性
二分聴法によって果たして半球優位性は推定できるのか？
結果と考察
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