普氏蹄蝠下丘对回声定位信号恒频成分的群体加工  

The study on group processing of Hipposideros pratti inferior colliculus to constant frequency component of echolocation signals

作　　者：徐娜[1] 李娟[1] 石青[1] 付子英[1] 唐佳[1] 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

出　　处：《兽类学报》2014年第3期217-224,共8页Acta Theriologica Sinica

基　　金：国家自然科学基金项目(31200832,31070971)

摘　　要：利用听觉诱发电位和计算机叠加平均技术研究了普氏蹄蝠下丘(Inferior colliculus,IC)500–4 000μm记录深度间,神经元群对3个谐波恒频(Constant frequency,CF)声刺激(CF1-CF3)的反应。结果显示,在蝙蝠回声定位信号CF成分刺激下,其IC的诱发电位包括2-4个波,在1 000μm以下的记录区域,3种刺激均能诱发on-off反应,on-反应的幅度均在3 000μm达最大之后减小(P<0.001),而潜伏期则逐渐缩短(P<0.001);CF2能诱发大幅度的off-反应,而CF1、CF3诱发的off-反应幅度较小,随着记录深度的增加,CF2(P<0.001)的off-反应潜伏期逐渐缩短,而CF1(P>0.05)和CF3(P>0.05)的潜伏期则无此单调性。结果表明神经元群体加工CF1-CF3的on-反应存在一致性变化,提示其对行为相关的声信号加工可能存在频率层间复杂的相互作用;对CF信号加工的off-反应对主频附近声较敏感,提示其可能在恒频-调频蝙蝠的多普勒频移、捕获振翅昆虫信息或种间交流中起着某种作用。We investigated the responses of neuron groups in the inferior colliculus of Pratt’s leaf-nosed bat （Hipposideros pratti）,during 500 -4 000 μm recording depth,to constant frequency components of three harmonics （CF1 - CF3 ）,using auditory evoked potential combined with the computer averaging technique. The results showed that evoked potential waves included 2 -4 peaks under the given stimuli,and all exhibited on-off responses below the 1 000 μm recording depth. With increasing recording depth,the amplitudes of on-responses all reached maximum at 3 000 μm and then decreased（P 〈0.001）,while the latencies decreased linearly （P 〈 0. 001）;the off-responses triggered by CF2 had the largest amplitudes, while the amplitudes of off-responses evoked by CF1 and CF3 were smaller. The off-responses of CF2 （P 〈0.001）had linearly decreasing latencies,but the CF1 （P 〉 0. 05）and CF3 （P 〉0. 05）had no such linear change with the increased recording depth. The results reveal there were unanimous tendency of neuron groups’processing on-responses, indicating that the processing of the acoustic signals related to behavior may have complex interactions among frequency layers;and off-responses were sensitive to the frequency near the dominant frequency, suggesting that they may play a role in Doppler shift,capturing the fluttering of insects or communication of constant frequency-frequency modulation bats.

关 键 词：普氏蹄蝠 下丘 听觉诱发电位 ON-OFF 反应 

分 类 号：Q42[生物学—神经生物学]