Schizophrenic illnesses occur with approximately the same incidence in all human populations with a characteristic distribution (slightly earlier in males) of ages of onset. Given that the predisposition (which presumably is genetic) is associated with a procreative disadvantage why do such illnesses persist? Here it is suggested that these conditions are a manifestation of genetic diversity in the evolution of the specifically human characteristic of language, an innovation that has occurred by a process of progressive hemispheric specialization-the establishment of dominance for some critical component of language in one or the other hemisphere. Individuals who develop schizophrenic symptoms show lesser anatomical and functional asymmetries than the population as a whole; such symptoms may reflect 'dominance failure' for language.

译文

在所有人群中,精神分裂症疾病的发病率几乎相同,并且发病年龄具有特征性分布(男性稍早)。鉴于这种易感性(可能是遗传性的)与生产性劣势有关,为什么这种疾病持续存在?在此建议这些条件是语言的特定人类特征演变过程中遗传多样性的体现,这种创新是通过逐步半球专业化的过程(在一个或多个语言中确定语言的某些关键成分的主导地位)而发生的。另一个半球。与整个人群相比,出现精神分裂症症状的个体在解剖学和功能上的不对称性较小。这样的症状可能反映了语言的“统治失败”。

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