Tuning to interaural time difference and frequency differs between the auditory arcopallium and the external nucleus of the inferior colliculus.
Tuning to interaural time difference and frequency differs between the auditory arcopallium and the external nucleus of the inferior colliculus.
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听觉区和下丘外核之间对耳间时间差和频率的调节不同。
作者：
Katrin Vonderschen;H. Wagner
仓鸮通过两条平行的通路处理声音定位信息，即中脑通路和前脑通路。从这些途径的远高级站，在前脑的听觉arcopallium和中脑下丘的外部核的听觉刺激的神经反应的细胞外记录，证明了在前脑通路的代表性的耳间时间差和频率不同于在中脑通路。具体来说，低频代表是保守的前脑通路，而它是在中脑通路丢失。两耳时差的变化在中脑通路上产生对称的调谐曲线。相比之下，典型的前脑调谐曲线是不对称的，具有跨越零时间差的陡峭斜率和朝向更大的对侧时间差异的不太陡峭的斜率。低声音频率有助于对这些不对称性背后的对侧主导声音的敏感性，而高频率则增强了耳间时间差较小时斜坡的陡度。此外，时间差异调谐曲线的峰宽在前脑比在中脑。最佳耳间时间差的最陡斜率分布在听觉Arcopallium，但不是在下丘的外核，集中在零时间差。在听觉arocpalestine中观察到的分布让人想起在小型哺乳动物中观察到的情况。我们推测，前脑的代表性可能作为一个人口代码，支持精细的歧视中央耳间的时间差和粗糙的指示偏侧性的刺激大耳间的时间差。
Barn owls process sound-localization information in two parallel pathways, the midbrain and the forebrain pathway. Exctracellular recordings of neural responses to auditory stimuli from far advanced stations of these pathways, the auditory arcopallium in the forebrain and the external nucleus of the inferior colliculus in the midbrain, demonstrated that the representations of interaural time difference and frequency in the forebrain pathway differ from those in the midbrain pathway. Specifically, low-frequency representation was conserved in the forebrain pathway, while it was lost in the midbrain pathway. Variation of interaural time difference yielded symmetrical tuning curves in the midbrain pathway. By contrast, the typical forebrain-tuning curve was asymmetric with a steep slope crossing zero time difference and a less-steep slope toward larger contralateral time disparities. Low sound frequencies contributed sensitivity to contralateral leading sounds underlying these asymmetries, whereas high frequencies enhanced the steepness of slopes at small interaural time differences. Furthermore, the peaks of time-disparity tuning curves were wider in the forebrain than in the midbrain. The distribution of the steepest slopes of best interaural time differences in the auditory arcopallium, but not in the external nucleus of the inferior colliculus, was centered at zero time difference. The distribution observed in the auditory arocpallium is reminiscent of the situation observed in small mammals. We speculate that the forebrain representation may serve as a population code supporting fine discrimination of central interaural time differences and coarse indication of laterality of a stimulus for large interaural time differences.
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DOI：
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