Functional topography of working memory for face or voice identity.
Functional topography of working memory for face or voice identity.
复制标题
面部或声音识别的工作记忆的功能拓扑。
DOI：
10.1016/j.neuroimage.2004.08.024
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Courtney,SusanM
中科院分区：
文献类型：
--
作者：
Rama,Pia;Courtney,SusanM
我们使用功能磁共振成像（fMRI）来研究非空间视觉和听觉工作记忆的神经系统是否表现出功能分离。受试者进行了延迟识别任务，以前不熟悉的面孔和声音和视听感觉运动控制任务。在最初的样本和随后的测试刺激介绍，激活是更大的脸比语音身份任务双边在枕颞叶皮层，相反，更大的声音比面孔双边在上级颞沟/回（STS/STG）。与控制延迟相比，两种记忆延迟都激活了大脑前额叶区域，并且在任务之间的直接体素比较中没有显着差异。然而，进一步的分析表明，在腹侧前额叶皮层的功能地形的两种延迟类型有一个微妙的差异。面部延迟优先激活腹侧前额叶皮层的背部（BA 44/45），而语音延迟优先激活下部（BA 45/47），表明腹侧前额叶皮层内的腹侧/背侧听觉/视觉地形图。结果证实，在刺激呈现过程中，视觉和听觉感觉区的活动存在一种模式特异性的注意调节。此外，在非空间信息类型的领域，有一个微妙的跨通道分离在腹侧前额叶皮层在工作记忆维持的面孔和声音。
We used functional magnetic resonance imaging (fMRI) to investigate whether the neural systems for nonspatial visual and auditory working memory exhibits a functional dissociation. The subjects performed a delayed recognition task for previously unfamiliar faces and voices and an audiovisual sensorimotor control task. During the initial sample and subsequent test stimulus presentations, activation was greater for the face than for the voice identity task bilaterally in the occipitotemporal cortex and, conversely, greater for voices than for faces bilaterally in the superior temporal sulcus/gyrus (STS/STG). Ventral prefrontal regions were activated by both memory delays in comparison with the control delays, and there was no significant difference in direct voxelwise comparisons between the tasks. However, further analyses showed that there was a subtle difference in the functional topography for two delay types within the ventral prefrontal cortex. Face delays preferentially activate the dorsal part of the ventral prefrontal cortex (BA 44/45) while voice delays preferentially activate the inferior part (BA 45/47), indicating a ventral/dorsal auditory/visual topography within the ventral prefrontal cortex. The results confirm that there is a modality-specific attentional modulation of activity in visual and auditory sensory areas during stimulus presentation. Moreover, within the nonspatial information-type domain, there is a subtle across-modality dissociation within the ventral prefrontal cortex during working memory maintenance of faces and voices.