Evidence for distinct human auditory cortex regions for sound location versus identity processing.

Evidence for distinct human auditory cortex regions for sound location versus identity processing.
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DOI:
10.1038/ncomms3585
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发表时间:
2013
影响因子:
16.6
通讯作者:
Raij, Tommi
Raij, Tommi
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Ahveninen, Jyrki;Huang, Samantha;Nummenmaa, Aapo;Belliveau, John W.;Hung, An-Yi;Jaaskelainen, Iiro P.;Rauschecker, Josef P.;Rossi, Stephanie;Tiitinen, Hannu;Raij, Tommi

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神经生理动物模型表明,前听觉皮层(AC)区域处理声音识别信息,而后听觉皮层专门处理声音定位信息。在人类中,不一致的神经影像学结果和不充分的因果证据对这种平行AC组织的存在提出了挑战。在这里,我们使用mri引导的配对脉冲经颅磁刺激(TMS)暂时抑制双侧前部或后部交流区,同时受试者听参考/探测声音对并执行声音定位或身份识别任务。经颅磁刺激脉冲的靶向性,在探针后55-145毫秒,通过个体水平的皮层电场估计得到证实。我们的数据显示,在声音识别过程中,经颅磁刺激后侧交流区比身份识别显著延迟反应时间(RT),而在声音识别过程中,经颅磁刺激前侧交流区比位置识别显著延迟反应时间(RT)。这种双重解离为前交流区语音同一性特征和后交流区语音定位的平行加工提供了直接的因果支持。
Neurophysiological animal models suggest that anterior auditory cortex (AC) areas process sound-identity information, whereas posterior ACs specialize in sound location processing. In humans, inconsistent neuroimaging results and insufficient causal evidence have challenged the existence of such parallel AC organization. Here we transiently inhibit bilateral anterior or posterior AC areas using MRI-guided paired-pulse transcranial magnetic stimulation (TMS) while subjects listen to Reference/Probe sound pairs and perform either sound location or identity discrimination tasks. The targeting of TMS pulses, delivered 55–145 ms after Probes, is confirmed with individual-level cortical electric-field estimates. Our data show that TMS to posterior AC regions delays reaction times (RT) significantly more during sound location than identity discrimination, whereas TMS to anterior AC regions delays RTs significantly more during sound identity than location discrimination. This double dissociation provides direct causal support for parallel processing of sound identity features in anterior AC and sound location in posterior AC.
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