Bushell C M
City University of New York, Graduate Center, New York VA Medical Center, USA.
Brain Lang. 1996 Nov;55(2):264-88. doi: 10.1006/brln.1996.0104.
Broca's aphasics performed a lexical decision task in a semantic priming experiment in which the proportion of related words was manipulated with a sufficiently long stimulus onset asynchrony for expectancy-based, strategic processing to operate. The control subjects showed the typical increase in semantic facilitation as relatedness proportion increased. However, the aphasic subjects demonstrated the opposite effect such that inhibitory semantic priming occurred as relatedness proportion increased even though, in a second experiment, these same aphasics showed an increase in facilitatory identity priming as relatedness proportion increased. This striking dissociation of identity and semantic priming for the aphasics was interpreted as supporting the "center-surround" theory (Carr & Dagenbach, 1990), which accounts for the same dissociation found in the normal population under challenging word-recognition conditions.
在一项语义启动实验中，布罗卡失语症患者执行了词汇判断任务。在该实验中，通过足够长的刺激起始异步时间来操纵相关词的比例，以便基于预期的策略性加工能够起作用。随着相关度比例的增加，对照组受试者表现出典型的语义促进作用增强。然而，失语症患者表现出相反的效果，即随着相关度比例的增加，出现了抑制性语义启动，尽管在第二个实验中，同样这些失语症患者随着相关度比例的增加，促进性的同一性启动有所增强。失语症患者这种同一性启动和语义启动的显著分离被解释为支持“中心-外周”理论（卡尔和达根巴赫，1990），该理论解释了在具有挑战性的单词识别条件下正常人群中发现的相同分离现象。
