Jäncke L
Department of Psychobiology and Psychocybernetics, Heinrich-Heine University, Düsseldorf, Federal Republic of Germany.
Percept Mot Skills. 1992 Dec;75(3 Pt 1):691-5. doi: 10.2466/pms.1992.75.3.691.
Auditory lateralization was investigated in 26 right-handed and 26 left-handed, normal subjects using two dichotic monitoring tasks in each proband [dichotic consonant-vowel (CV) syllable monitoring once with the syllable /ta/ and once with the syllable /da/ as target]. Subjects were instructed to monitor for the presence of a target CV which could occur in either ear. They responded by depressing a response button; reaction time (RT) and hit rates were recorded. In right-handers the syllable /ta/ presented to the right ear was detected more frequently, on the average, than presented to the left ear. Also, RT was shorter for detection of /ta/ in the right ear than for detection in the left ear for both right- and left-handers. The detection of /da/ showed no ear advantage in hit rate and RT either for right-handers or for left-handers. These results demonstrate the existence of a right-ear advantage in dichotic monitoring of the target syllable /ta/ but not for the target syllable /da/. This difference in evoking a right-ear advantage is attributed to a difference in the difficulty of detection of both targets. It is argued that the detection of /da/ is too difficult to evoke phonetic processing, leading to a right-ear advantage.
对26名右利手和26名左利手的正常受试者进行了听觉定位研究，每位受试者使用两项双耳监听任务[双耳辅音 - 元音（CV）音节监听，以音节/ta/和音节/da/作为目标各进行一次]。受试者被要求监听目标CV的出现，目标CV可能出现在任何一只耳朵中。他们通过按下响应按钮做出反应；记录反应时间（RT）和命中率。在右利手人群中，平均而言，呈现给右耳的音节/ta/比呈现给左耳的更频繁地被检测到。此外，对于右利手和左利手来说，右耳检测/ta/的反应时间都比左耳检测/ta/的反应时间短。对于右利手或左利手，/da/的检测在命中率和反应时间上都没有显示出耳优势。这些结果表明，在双耳监听目标音节/ta/时存在右耳优势，但对于目标音节/da/则不存在。诱发右耳优势的这种差异归因于两个目标检测难度的不同。有人认为，/da/的检测太难以至于无法引发语音处理，从而导致右耳优势。
