Lishman W A, McMeekan E R
Cortex. 1977 Mar;13(1):30-43. doi: 10.1016/s0010-9452(77)80051-8.
In so far as ear asymmetries on dichotic listening reflect cerebral dominance for language, the present evidence indicates a progressively decreasing incidence of left hemisphere dominance in right handed, mixed handed and left handed individuals. In the absence of a family history of sinistrality there are no indications that the degree of dominance is reduced in left handers or mixed handers when compared to right handers, nor that right hemisphere dominance is less securely established than left hemisphere dominance. Among strong left handers with a family history of sinistrality, however, ear difference scores are significantly smaller, indicating reduced lateralization or bilateral representation of language in such individudals. This applies equally in left dominant and right dominant left handers.
就双耳分听时的耳朵不对称反映大脑语言优势而言，目前的证据表明，右利手、混合利手和左利手个体中左半球优势的发生率逐渐降低。在没有左利手家族史的情况下，没有迹象表明与右利手相比，左利手或混合利手的优势程度有所降低，也没有迹象表明右半球优势的建立不如左半球优势稳固。然而，在有左利手家族史的强左利手个体中，耳朵差异分数显著更小，表明这些个体的语言侧化程度降低或语言呈双侧表征。这同样适用于左优势和右优势的左利手个体。
