Tracking Lexical Access in Speech Production: Electrophysiological Correlates of Word Frequency and Cognate Effects
Tracking Lexical Access in Speech Production: Electrophysiological Correlates of Word Frequency and Cognate Effects
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DOI：
10.1093/cercor/bhp153
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发表时间：
2010-04-01
期刊：
影响因子：
3.7
通讯作者：
Thierry, Guillaume
中科院分区：
文献类型：
--
作者：
Strijkers, Kristof;Costa, Albert;Thierry, Guillaume
本研究通过探索显性命名过程中词频和同源效应的轨迹，建立了语音产生过程中词汇获取的电生理指标。我们用16名西班牙-加泰罗尼亚双语者用西班牙语（第一语言）和16名加泰罗尼亚-西班牙双语者用西班牙语（第二语言）进行了2项事件相关电位（ERP）研究。行为结果显示明显的频率效应以及频率与同源状态之间的相互作用。高频词产生过程中诱发的ERP在目标呈现后150 ~ 200 ms之间偏离低频ERP，并持续偏离直到语音出现。当比较同源和非同源条件时，得到了相同的结果。在词频效应和同源效应中，命名潜伏期与P2分量的平均振幅呈显著正相关。我们得出结论，图片命名过程中的词汇访问开始于图片呈现后约180毫秒。此外，这些结果为语音产生中频率和同源状态的早期影响提供了直接的电生理学证据。讨论了这些发现对语音产生模型的理论意义。
The present study establishes an electrophysiological index of lexical access in speech production by exploring the locus of the frequency and cognate effects during overt naming. We conducted 2 event-related potential (ERP) studies with 16 Spanish-Catalan bilinguals performing a picture naming task in Spanish (L1) and 16 Catalan-Spanish bilinguals performing a picture naming task in Spanish (L2). Behavioral results showed a clear frequency effect and an interaction between frequency and cognate status. The ERP elicited during the production of high-frequency words diverged from the low-frequency ERP between 150 and 200 ms post-target presentation and kept diverging until voice onset. The same results were obtained when comparing cognate and noncognate conditions. Positive correlations were observed between naming latencies and mean amplitude of the P2 component following the divergence, for both the lexical frequency and the cognate effects. We conclude that lexical access during picture naming begins approximately 180 ms after picture presentation. Furthermore, these results offer direct electrophysiological evidence for an early influence of frequency and cognate status in speech production. The theoretical implications of these findings for models of speech production are discussed.