Bouma A, Ansink B J
Department of Clinical Psychology, Free University, Amsterdam, The Netherlands.
J Clin Exp Neuropsychol. 1988 Dec;10(6):709-26. doi: 10.1080/01688638808402809.
Dichotic listening performance was studied in 35 aphasic patients with unilateral brain lesions. Within this group, 30 patients exhibited an abnormal ear discrepancy: 20 patients showed a left-ear advantage (right-ear extinction), and 10 patients showed a right-ear advantage (left-ear extinction). All subjects were given a number of verbal tasks in order to evaluate several aspects of their linguistic abilities. For the left-ear advantage group, verbal scores were positively related to left-ear scores, but not to right-ear scores. For the right-ear advantage group, verbal scores were positively related to both left- and right-ear scores. The present results lend partial support for the prediction that right-ear extinction is associated with damage to the temporal lobe involving the geniculo-temporal system. No support was found for the prediction that left-ear extinction is associated with lesions placed in the deep structures of the parietal or parieto-occipital lobe involving the corpus callosum system. Our data indicate that the initial severity of brain injury is a critical factor in determining the direction of ear extinction, the lesions being larger in the left-ear advantage group. Results are discussed in relationship to other explanations of ipsilateral and contralateral extinction in aphasic patients.
对35例患有单侧脑损伤的失语症患者进行了双耳分听能力研究。在这组患者中，30例患者表现出异常的双耳差异：20例患者表现出左耳优势（右耳消退），10例患者表现出右耳优势（左耳消退）。所有受试者都接受了多项语言任务，以评估其语言能力的几个方面。对于左耳优势组，语言分数与左耳分数呈正相关，但与右耳分数无关。对于右耳优势组，语言分数与左耳和右耳分数均呈正相关。目前的结果部分支持了以下预测：右耳消退与涉及膝状体颞叶系统的颞叶损伤有关。未发现支持以下预测的证据：左耳消退与涉及胼胝体系统的顶叶或顶枕叶深部结构损伤有关。我们的数据表明，脑损伤的初始严重程度是决定双耳消退方向的关键因素，左耳优势组的损伤更大。结合对失语症患者同侧和对侧消退的其他解释对结果进行了讨论。
