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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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Effects of forward masking on the responses of the inferior collicular neurons in the big brown bats, Eptesicus fuscus

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Chinese Science Bulletin 2003年第16期48卷 1748-1752页

作者： LUANRuihong wufeijian P.H.S.Jen SUNXinde CollegeofLifeSciences EastChinaNormalUniversityShanghai200062China CollegeofLifeSciences CentralChinaNormalUniversityWuhan430079China DivisionofBiologicalSciences UMCMO65211USA

The present study explores the forward mask-ing of the two-tone stimuli in sequence that evoked responses in the inferior colliculus (IC) of the echolocating bats. The results indicate that forward masking is obvious in the acoustic responses of the IC neurons to the two-tone stimuli. Meanwhile the intensity sensitivity of the neurons respond-ing to the probe increases with the inter-tone interval de-creasing. The effects of forward masking are correlated with the relative intensity and the interval between the masker and probe. That is, the effects of forward masking are re-duced with the masker intensity decreasing and enhanced with the probe intensity decreasing and the inter-tone inter-val shortened. The present study suggests that there is a cor-relation between the characteristics of the response to the probe and the dynamic conditions of the postsynaptic cur-rents in the IC neurons.

关键词：神经元回音声音间隔声音探测器前掩蔽 IC 回声定位生理学多突触传递

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