Statistical properties of responses to dichotic listening with CV nonsense syllables

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Abstract
Listeners (24) received 20 dichotic listening runs of 30 pairs of natural CV [consonant-vowel] nonsense syllables/run. Left- and right-ear responses were represented by 2 partially overlapping normal distributions with equal variance. Observed ear advantages across listening runs were also distributed normally. The means of the distributions of ear advantage were listener specific, but the SD were 10.8% .+-. 2.5. The origin of reversals in direction of ear advantage among listening runs was statistical, a small mean/sigma ratio; and .apprx. 6 listening runs (180 listening trials) were required to achieve a split-half reliability coefficient of +0.90.