兽类学报 ›› 2014, Vol. 34 ›› Issue (3): 209-.

• 论文 •    下一篇

普氏蹄蝠下丘谐波主频神经元的时程选择性

彭康 王靖 杨明建 李玉兰 付子英 唐佳 陈其才   

  1. 华中师范大学生命科学学院
  • 出版日期:2014-08-15 发布日期:2014-11-26
  • 通讯作者: 陈其才 E-mail:chenqc@mail.ccnu.edu.cn
  • 基金资助:
    国家自然科学基金项目(31200832,31070971)

Duration selectivity of inferior collicular neurons within the dominant frequency of echolocation signal in Pratt’s roundleaf bat,Hipposideros pratti

PENG Kang,WANG Jing,YANG Mingjian,LI Yulan,FU Ziying,TANG Jia,CHEN Qicai   

  1. Central China Normal University
  • Online:2014-08-15 Published:2014-11-26
  • Contact: CHEN Qicai E-mail:chenqc@mail.ccnu.edu.cn

摘要: 为探讨下丘(Inferior colliculus,IC)回声定位信号主频范围内的神经元的时程选择性,在自由声场刺激条件下,我们在4 只普氏蹄蝠的IC 采用不同时程的声刺激,研究了神经元的时程选择性。通过在体细胞外记录,共获得56 个声敏感下丘神经元,其记录深度、最佳频率和最小阈值的范围分别为1547 - 3967 (2878. 9 ±629.1)μm,20 -68 (49.0 ± 11. 1)kHz 和36.5 -95. 5 (59. 8 ±13. 0)dB SPL。根据所记录到的下丘神经元对不同时程的声刺激的反应,即对不同时程的选择性(Duration selectivity),将其分为6 种类型:短通型(Short-pass,SP,n = 11/56)、带通型(Band-pass,BP,n = 1/56)、长通型(Long-pass,LP,n = 5 /56)、反带通型(Band-reject,BR,n = 3 /56)、多峰型(Multi-peak,MP,n =6 /56)和全通型(All-pass,AP,n =30 /56)或非时程选择型(Nonduration-selective,NDS)。通过比较普氏蹄蝠下丘谐波主频内和主频外神经元的时程选择性,我们发现处于回声定位信号主频范围内神经元(n =32)比主频外神经元(n = 24)具有更短的最佳时程和更高的时程选择性。结果提示,在普氏蹄蝠回声定位过程中谐波主频内神经元较谐波主频外神经元发挥了更为重要的作用。

关键词: 下丘神经元, 时程选择性, 主频, 普氏蹄蝠

Abstract: In order to probe the duration selectivity of inferior collicular (IC)neurons within the dominant frequency (DF) of echolocation signals emitted by Pratt’s roundleaf bats (Hipposideros pratti),the present study was performed on the IC of 4 Pratt’s roundleaf bats. A total of 56 IC neurons were isolated using extracellular recording under free-field stimulation conditions. The ranges of recording depth,best frequency and minimum threshold of these IC neurons were 1547 - 3967μm(mean ± SD 2878. 9 ± 629. 1),20 -68 kHz (49. 0 ±11.1) kHz and 36. 5 -95. 5dB SPL (59. 8 ± 13. 0) dB SPL,respectively. The duration selectivity of these neurons was examined with sound stimuli of different durations and duration-selective neurons were classified into six types:short-pass (SP,n =11/ 56),band-pass (BP,n =1 /56),long-pass (LP,n = 5/56),band-reject (BR,n =3/56),multi-peak (MP,n = 6 /56)and all-pass (AP,n =30/56)neurons. By comparison of duration selectivity between the neurons within and outside the dominant frequency of echolocation signals,we found that neurons (n = 32)within the DF of echolocation signals had higher duration selectivity and shorter best duration than did those (n =24)outside of the DF of echolocation signal. Therefore,the results suggest that the neurons within DF play a more important role than those without DF during echolocating of Pratt’s roundleaf bat

Key words: Dominant frequency, Duration selectivity, Inferior collicular neuron, Pratt’s roundleaf bat