Specialization along the left superior temporal sulcus for auditory categorization.
Specialization along the left superior temporal sulcus for auditory categorization.
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DOI：
10.1093/cercor/bhq045
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发表时间：
2010-12
期刊：
影响因子：
--
通讯作者：
Binder JR
中科院分区：
文献类型：
--
作者：
Liebenthal E;Desai R;Ellingson MM;Ramachandran B;Desai A;Binder JR
采用功能磁共振成像（fMRI）和事件相关电位（ERPs）同时记录，研究了复杂声音分类中、后颞上皮层功能场的亲和性和时间过程。研究人员比较了受试者在训练前后对具有类言语特性的不熟悉的非音素听觉模式（NP）和熟悉的音素听觉模式(P)进行分类的数据。左侧后颞上沟（pSTS）训练后，对NP的fMRI激活增加。ERP P2对NP的反应也随着训练的增加而增加，其头皮地形与左侧后颞上发生器一致。相比之下，左侧颞中上沟（mSTS）仅在P时显示fMRI激活，并且这种反应不受训练的影响。P2对P的反应也独立于训练，其估计来源在左侧颞上皮层更前。结果与左pSTS在相关声音特征的短期表征中的作用一致，这些声音特征为识别新获得的声音类别提供了基础。高度熟悉的音位模式的分类是由左mSTS的长期表征介导的。研究结果对腹侧和背侧听觉流的功能提供了新的认识。
The affinity and temporal course of functional fields in middle and posterior superior temporal cortex for the categorization of complex sounds was examined using functional magnetic resonance imaging (fMRI) and event-related potentials (ERPs) recorded simultaneously. Data were compared before and after subjects were trained to categorize a continuum of unfamiliar nonphonemic auditory patterns with speech-like properties (NP) and a continuum of familiar phonemic patterns (P). fMRI activation for NP increased after training in left posterior superior temporal sulcus (pSTS). The ERP P2 response to NP also increased with training, and its scalp topography was consistent with left posterior superior temporal generators. In contrast, the left middle superior temporal sulcus (mSTS) showed fMRI activation only for P, and this response was not affected by training. The P2 response to P was also independent of training, and its estimated source was more anterior in left superior temporal cortex. Results are consistent with a role for left pSTS in short-term representation of relevant sound features that provide the basis for identifying newly acquired sound categories. Categorization of highly familiar phonemic patterns is mediated by long-term representations in left mSTS. Results provide new insight regarding the function of ventral and dorsal auditory streams.
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