Representation of binaural spatial cues in Field L of the barn owl forebrain
Representation of binaural spatial cues in Field L of the barn owl forebrain
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DOI：
10.1152/jn.1998.79.2.879
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发表时间：
1998-02-01
影响因子：
2.5
通讯作者：
Knudsen, EI
中科院分区：
文献类型：
--
作者：
Cohen, YE;Knudsen, EI
本研究探讨了仓鸮Field L空间信息的表征，经典听觉通路的第一个端脑加工阶段。场L单位记录细胞外，和他们的反应，双耳提出的耳间时间差（ITD）和耳间电平差（ILD）进行了测试。我们在L场观察到各种调谐曲线。一些部位对ITD或IILD不敏感。其他站点，特别是那些在高频区域，是高度选择性的ITD和ILD值。这些站点具有多峰（通常称为“相位模糊”）ITD调谐配置文件，并针对ILD的单个值进行调谐。这些网站的调谐性能是相似的下丘中央核的外侧壳中看到的。虽然场L网站的调谐性能类似于下丘中观察到的，这种空间信息的功能组织是根本不同的。而在下丘的空间信息被组织成全球地形图，在字段L空间信息被组织成本地集群，与网站具有类似的双耳调谐特性分组在一起。双耳线索的代表性领域L表明，它是参与听觉空间处理，但在较低水平的信息处理比听觉archistriatum，前脑区，专门用于处理空间信息，并在前脑空间处理途径的信息处理水平是非常相似的那些在著名的中脑空间处理途径。
This study examined the representation of spatial information in the barn owl Field L, the first telencephalic processing stage of the classical auditory pathway. Field L units were recorded extracellularly, and their responses to dichotically presented interaural time differences (ITD) and interaural level differences (ILD) were tested. We observed a variety of tuning profiles in Field L. Some sites were not sensitive to ITD or I ILD. Other sites, especially those in the high-frequency region, were highly selective for values of ITD and ILD. These sites had multipeaked (commonly called "phase ambiguous") ITD tuning profiles and were tuned for a single value of ILD. The tuning properties of these sites are similar to those seen in the lateral shell of the central nucleus of the inferior colliculus. Although the tuning properties of Field L sites were similar to those observed in the inferior colliculus, the functional organization of this spatial information was fundamentally different. Whereas in the inferior colliculus spatial information is organized into global topographics maps, in Field L spatial information is organized into local clusters, with sites having similar binaural tuning properties grouped together. The representation of binaural cues in Field L suggests that it is involved in auditory space processing but at a lower level of information processing than the auditory archistriatum, a forebrain area that is specialized for processing spatial information, and that the levels of information processing in the forebrain space processing pathway are remarkably similar to those in the well-known midbrain space processing pathway.