大蹄蝠回声定位信号特征与下丘神经元频率调谐  

Spectrum Characteristics of Echolocation Call and Frequency Tuning of Inferior Collicular Neurons in Hipposideros armiger

作　　者：付子英[1] 唐佳[1] JEN Philip Hung-Sun 陈其才[1] 

机构地区：[1]华中师范大学生命科学学院遗传调控与整合生物学湖北省重点实验室,武汉430079 [2]Division of Biological Sciences and Interdisciplinary Neuroscience Program,University of Missouri-Columbia

出　　处：《动物学杂志》2009年第1期128-132,共5页Chinese Journal of Zoology

基　　金：国家自然科学基金项目(No.30670695);美国密苏里大学生物科学系基金项目

摘　　要：采用超声监测仪录制超声信号和细胞外电生理记录下丘神经元的频率调谐曲线(frequency tuning curves,FTCs)的方法,探讨了大蹄蝠(Hipposideros armiger)回声定位信号与下丘(inferior colliculus,IC)神经元频率调谐之间的相关性。结果发现,大蹄蝠回声定位叫声为恒频-调频(constant frequency-frequency modulated,CF-FM)信号,一般含有2～3个谐波,第二谐波为其主频,CF成分频率(Mean±SD,n=18)依次为:(33.3±0.2)、(66.5±0.3)、(99.4±0.5)kHz;电生理实验共获得72个神经元的频率调谐曲线,Q10-dB值的范围是0.5～95.4(9.2±14.6,n=72),最佳频率(best frequency,BF)在回声定位主频附近的神经元具有尖锐的频率调谐特性。结果表明,大蹄蝠回声定位信号与下丘神经元频率调谐存在相关性,表现为最佳频率在回声定位信号主频附近的神经元频率调谐曲线的Q10-dB值较大,具有很强的频率分析能力。In order to explore the relationship between the echolocation call or signal of leaf-nosed bats （Hipposideros armiger） and frequency tuning of inferior collicular neurons, the echolocation calls of the leaf-nosed bats were recorded using bat detector and frequency tuning curves （FTCs） of inferior collicular （IC） neurons were obtained by extracellular recording. The results showed that the echolocation calls of the leaf-nosed bats were constant frequency- frequency modulation （CF-FM） signals with 2 - 3 harmonics and the second one among these three harmonics was its dominant frequency. The constant frequency （CF） components of three harmonics （Mean ＋ SD, n = 18 ） were 33.3± 0.2 kHz, 66.5 ± 0.3 kHz, and 99.4 ± 0.5 kHz, respectively. In examined FTCs of 72 IC neurons, their Q10-dB values ranged from 0.5 to 95.4 （9.2± 14.6） and the neurons whose best frequency （BF） around the dominant frequency had sharp frequency tuning. Thus, the neurons with sharp frequency tuning and high Q10-dB values showed that there was certain relationship between echolocation call and frequency tuning of IC neurons in the leaf-nosed bats.

关 键 词：回声定位信号 下丘神经元 频率调谐 大蹄蝠 

分 类 号：Q42[生物学—神经生物学]