Nebes R D
University of Pittsburgh Medical School, PA.
J Clin Exp Neuropsychol. 1994 Aug;16(4):489-97. doi: 10.1080/01688639408402660.
Studies of semantic priming (facilitation of lexical processing by a prior semantic context) suggest that semantic-memory structure remains intact in Alzheimer's disease (AD). Recently, however, it has been claimed that the priming produced by single-word primes reflects merely the facilitation of preexisting lexical associations (intralexical priming) and thus reveals nothing about semantic memory in AD. Other studies showing normal priming in AD have used sentences as primes. However, intralexical priming originating from individual words within the sentence might also account for this type of contextual priming. This possibility was examined by reanalyzing previous sentence-priming results using data only from those trials where there was little likelihood of intralexical priming. This did not change the previous pattern of priming facilitation, suggesting that the normal sentence priming found in AD patients derives from the message conveyed by the sentence as a whole, rather than from simple intralexical associations.
语义启动（先前语义语境对词汇加工的促进作用）研究表明，语义记忆结构在阿尔茨海默病（AD）中保持完整。然而，最近有人声称，单个单词启动所产生的启动效应仅仅反映了预先存在的词汇联想（词汇内启动）的促进作用，因此无法揭示AD患者的语义记忆情况。其他显示AD患者启动效应正常的研究使用句子作为启动刺激。然而，句子中单个单词产生的词汇内启动也可能解释这种语境启动。通过仅使用那些词汇内启动可能性很小的试验数据重新分析先前的句子启动结果，对这种可能性进行了检验。这并没有改变先前的启动促进模式，表明AD患者中发现的正常句子启动效应源自句子整体传达的信息，而非简单的词汇内联想。
