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Topography of acoustic response characteristics in the midbrain inferior colliculus of Kunming mouse

Chinese Science Bulletin 2003年第2期48卷 161-165页

作者： shenjunxian XUZhimin 等 CenterforBrainandCognitiveScience.LaboratoryofVisualInformationProcessing.InstituteofBiophysics ChineseAcademyofSciencesBeijing100101China CenterforBrainandCognitiveScience.LaboratoryofVisualInforma

Topography of acoustic response characteris-tics of the midbrain inferior colliculus (IC) of the Kunming mouse was studied by using extracellular recording tech-niques. The characteristic frequency (CF) range represented in the different divisions of the IC differed markedly: 4—15 kHz in the dorsal cortex (DC), 10—70 kHz in the centralnucleus (CN), and 4—35 kHz in the external cortex (EC).The CF in the CN increased from dorsal and lateral to ven-tral and medial, higher CFs represented at its ventromedial part and lower CFs at its dorsal part. The isofrequency con-tours of CFs were incurvate. Minimum thresholds (MT) ofthe auditory neurons in DC and the central part of CN were lower (about 10 dB SPL), but considerably higher in thedorsal and ventral region of EC. Results suggest that each of the divisions in the mouse IC may have different auditory functions.

关键词：昆明小白鼠中脑四叠体下丘听觉反应听神经阈值

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Role of frequency band integration in sharpening frequency tunings of the inferior colliculus neurons in the big brown bat, Eptesicus fuscus

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Chinese Science Bulletin 2004年第10期49卷 1026-1031页

作者： WUFeijian CHENQicai JENPhilipH.S. shenjunxian SchoolofLifeSciences.CentralChinaNormalUniversity.Wuhan430079.China DivisionofBiologicalSciences UniversityofMissouri-Columbia.MO65211.USA LaboratoryofVisualInformationProcessing InstituteofBiophysicsChineseAcademyofSciencesBeijing100101China

By means of a particular two-tone stimulationparadigm in combination of using a pair of electrodes forsimultaneously recording from two inferior colliculus (IC)neurons, the current in vivo study is undertaken to explorethe role of frequency band integration (FBI) in sharpening offrequency tuning in the big brown bat, Eptesicus *** major results are found: (1) The paired neurons cor-related to FBI are located not only within the same frequencyfilter bandwidth (FFB), but also across different FFBs. Therelations of their frequency tuning curves (FTCs) are mainlyof two types: the flank-overlapped and overlaid patterns. (2)Although the sharpness of FTCs between paired neurons ismutual, the sharpening efficiency of neurons located withinthe same FFB is higher than that of neurons across FFBs,and the FTCs of neurons with the best frequencies (BF) of 20--30 kHz are most strongly sharpened. (3) The strength ofFBI is weak near the BF but gradually increased with fre-quencies away from the BF of sound stimuli. This suggeststhat the dynamical FBI of the IC neurons located within and across the FFBs might be involved in the formation of func-tional FFB structures.

关键词：频带综合频率调节下丘神经蝙蝠平滑

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