在图片命名验证中,将词汇语义访问与其他记忆过程分开。
Separating lexical-semantic access from other mnemonic processes in picture-name verification.
机构信息
Brain Imaging and Modeling Section, National Institute on Deafness and Other Communication Disorders, National Institutes of Health Bethesda, MD, USA.
出版信息
Front Psychol. 2013 Oct 11;4:706. doi: 10.3389/fpsyg.2013.00706. eCollection 2013.
We present a novel paradigm to identify shared and unique brain regions underlying non-semantic, non-phonological, abstract, audio-visual (AV) memory vs. naming using a longitudinal functional magnetic resonance imaging experiment. Participants were trained to associate novel AV stimulus pairs containing hidden linguistic content. Half of the stimulus pairs were distorted images of animals and sine-wave speech versions of the animal's name. Images and sounds were distorted in such a way as to make their linguistic content easily recognizable only after being made aware of its existence. Memory for the pairings was tested by presenting an AV pair and asking participants to verify if the two stimuli formed a learned pairing. After memory testing, the hidden linguistic content was revealed and participants were tested again on their recollection of the pairings in this linguistically informed state. Once informed, the AV verification task could be performed by naming the picture. There was substantial overlap between the regions involved in recognition of non-linguistic sensory memory and naming, suggesting a strong relation between them. Contrasts between sessions identified left angular gyrus and middle temporal gyrus as key additional players in the naming network. Left inferior frontal regions participated in both naming and non-linguistic AV memory suggesting the region is responsible for AV memory independent of phonological content contrary to previous proposals. Functional connectivity between angular gyrus and left inferior frontal gyrus and left middle temporal gyrus increased when performing the AV task as naming. The results are consistent with the hypothesis that, at the spatial resolution of fMRI, the regions that facilitate non-linguistic AV associations are a subset of those that facilitate naming though reorganized into distinct networks.
我们提出了一种新的范例,通过纵向功能磁共振成像实验,来识别非语义、非语音、抽象、视听(AV)记忆与命名所共有的和独特的大脑区域。参与者被训练来关联包含隐藏语言内容的新的视听刺激对。刺激对的一半是动物的失真图像和动物名称的正弦波语音版本。这些图像和声音被扭曲,以便在意识到其存在之后,才能轻松识别其语言内容。通过呈现一对视听刺激并要求参与者验证两个刺激是否形成了学习配对来测试对配对的记忆。在记忆测试之后,隐藏的语言内容被揭示,参与者在这种语言信息状态下再次测试对配对的回忆。一旦得到通知,就可以通过命名图片来执行视听验证任务。在识别非语言感觉记忆和命名中涉及的区域之间存在大量重叠,表明它们之间存在很强的关系。会话之间的对比确定了左角回和中颞回是命名网络的关键附加参与者。左侧额下回区域参与命名和非语言视听记忆,这表明该区域负责视听记忆,与先前的提议相反,与语音内容无关。执行视听任务时,角回和左侧额下回以及左侧中颞回之间的功能连接增加。结果与假设一致,即在 fMRI 的空间分辨率下,促进非语言视听联想的区域是促进命名的区域的子集,尽管重新组织为不同的网络。