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Nouns and verbs in the brain: Grammatical class and task specific effects as revealed by fMRI
Cognitive Neuropsychology ( IF 3.4 ) Pub Date : 2008-06-01 , DOI: 10.1080/02643290701674943
Manuela Berlingeri 1 , Davide Crepaldi , Rossella Roberti , Giuseppe Scialfa , Claudio Luzzatti , Eraldo Paulesu
Affiliation  

The wide variety of techniques and tasks used to study the neural correlates of noun and verb processing has resulted in a body of inconsistent evidence. We performed a functional magnetic resonance imaging (fMRI) experiment to detect grammatical class effects that generalize across tasks. A total of 12 participants undertook a grammatical-class switching task (GCST), in which they were presented with a noun (or a verb) and were asked to retrieve the corresponding verb (or noun), and a classical picture naming task (PNT) widely used in the previous aphasiological and imaging literature. The GCST was explicitly designed to ensure control over confounding variables, such as stimulus complexity or imageability. Conjunction analyses of the haemodynamic responses measured in the two tasks indicated a shared verb-related activation of a dorsal premotor and posterior parietal network, pointing to a strong relationship between verb representation and action-oriented (visuo-)spatial knowledge. On the other hand, no brain area was consistently associated with nouns in both tasks. Moreover, there were task-dependent differences between noun and verb retrieval both at behavioural and at physiological level; the grammatical class that elicited the longest reaction times in both tasks (i.e., verbs in the PNT and nouns in the GCST) triggered a greater activation of the left inferior frontal gyrus. Therefore, we suggest that this area reflects a general increase in task demand rather than verb processing per se.

中文翻译:

大脑中的名词和动词:fMRI 揭示的语法类别和任务特定效应

用于研究名词和动词处理的神经关联的各种技术和任务导致了大量不一致的证据。我们进行了功能磁共振成像 (fMRI) 实验,以检测泛化任务的语法类效应。共有 12 名参与者进行了语法类切换任务 (GCST),其中呈现给他们一个名词(或动词)并被要求检索相应的动词(或名词),以及经典图片命名任务(PNT) ) 在以前的失语症和影像学文献中广泛使用。GCST 旨在确保控制混杂变量,例如刺激复杂性或可成像性。对两项任务中测量的血液动力学反应的联合分析表明,背侧前运动和后顶叶网络共享与动词相关的激活,表明动词表征与面向动作的(视觉)空间知识之间存在很强的关系。另一方面,在这两项任务中,没有大脑区域始终与名词相关联。此外,名词和动词检索在行为和生理水平上都存在任务依赖的差异;在两个任务中引起最长反应时间的语法类别(即 PNT 中的动词和 GCST 中的名词)触发了左额下回的更大激活。因此,我们建议该区域反映了任务需求的普遍增加,而不是动词处理本身。指出动词表示与面向动作的(视觉)空间知识之间的密切关系。另一方面,在这两项任务中,没有大脑区域始终与名词相关联。此外,名词和动词检索在行为和生理水平上都存在任务依赖的差异;在两个任务中引起最长反应时间的语法类别(即 PNT 中的动词和 GCST 中的名词)触发了左额下回的更大激活。因此,我们建议该区域反映了任务需求的普遍增加,而不是动词处理本身。指出动词表示与面向动作的(视觉)空间知识之间的密切关系。另一方面,在这两项任务中,没有大脑区域始终与名词相关联。此外,名词和动词检索在行为和生理水平上都存在任务依赖的差异;在两个任务中引起最长反应时间的语法类别(即 PNT 中的动词和 GCST 中的名词)触发了左额下回的更大激活。因此,我们建议该区域反映了任务需求的普遍增加,而不是动词处理本身。在行为和生理层面,名词和动词检索之间存在任务依赖的差异;在两个任务中引起最长反应时间的语法类(即 PNT 中的动词和 GCST 中的名词)触发了左额下回的更大激活。因此,我们建议该区域反映了任务需求的普遍增加,而不是动词处理本身。在行为和生理层面,名词和动词检索之间存在任务依赖的差异;在两个任务中引起最长反应时间的语法类别(即 PNT 中的动词和 GCST 中的名词)触发了左额下回的更大激活。因此,我们建议该区域反映了任务需求的普遍增加,而不是动词处理本身。
更新日期:2008-06-01
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