Faust M E, Gernsbacher M A
Department of Psychology, Washington University, St. Louis, MO 63130, USA.
Brain Lang. 1996 May;53(2):234-59. doi: 10.1006/brln.1996.0046.
In two experiments we investigated the extent to which interference from contextually inappropriate information was attenuated or suppressed over time in the two cerebral hemispheres during sentence comprehension. Subjects viewed centrally presented sentences ending in either a homophone or a homograph and made speeded judgments as to whether a laterally presented test word was related to the overall meaning of the sentence. Suppression of contextually inappropriate forms of homophones was found when test words were presented to either hemifield, but suppression of inappropriate senses of homographs was found only when test words were presented to the right visual hemifield. The results from the homograph experiment are consistent with the hypothesis that right and left hemisphere semantic selection systems operate in qualitatively different ways. The results from the homophone experiment suggest that while the left hemisphere may be more efficient at suppression, both hemispheres possess the ability to suppress inappropriate information to some degree.
在两项实验中，我们研究了在句子理解过程中，上下文不适当信息的干扰在两个大脑半球中随时间衰减或抑制的程度。受试者观看以同音异形词或同形异义词结尾的中央呈现的句子，并对随后呈现的侧向测试词是否与句子的整体含义相关做出快速判断。当测试词呈现给任何一个半视野时，都发现了对同音异形词上下文不适当形式的抑制，但只有当测试词呈现给右视觉半视野时，才发现了对同形异义词不适当意义的抑制。同形异义词实验的结果与左右半球语义选择系统以质的不同方式运作的假设一致。同音异形词实验的结果表明，虽然左半球在抑制方面可能更有效，但两个半球都具有在一定程度上抑制不适当信息的能力。
