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The Research on the Relationship between Dominant Frequent and Middle Ear Structure of Bats and the Selectivity of Infancy Mice’s Inferior Colliculus for Frequent-Modulated Sound

Author: HanXiaoYan
Tutor: WuFeiJian
School: Central China Normal University
Course: Zoology
Keywords: Bat Frequency Middle ear Young mice Inferior colliculus FM sound
CLC: Q62
Type: Master's thesis
Year: 2009
Downloads: 25
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Abstract

Hearing the human important channel of communication with the outside world, second only in importance to the visual. The most significant characteristics of the acoustic signal is the dynamic changes of the frequency, the acoustic signals of most animal contain FM (frequentmodulation; FM) components. FM sound is a very meaningful work. This study compared the neurons in the inferior colliculus response properties of FM sound in the middle ear structure and frequency of the bat and juvenile Kunming mice to further understanding of the animal from the structure and function of the auditory system how to listen to the sound of the FM. The first chapter, first measure the length of the tympanic membrane area of ??the middle ear, the oval window area, the length of the handle of the malleus and incus amacrine of 21 species of bats (including 13 kinds FM bat and eight kinds of CF-FM bats), the use of SPSS13 .0 software analysis the bat middle ear structure of their echolocation sonic frequency, the results show that: (1) bat malleus handle the length and incus amacrine the length (P lt; 0.001; r = 0.978; n = 17), the eardrum area and the area of ??the oval window (P lt; 0.001; r = 0.906; n = 10) were a significant positive correlation; (2) bat conversion rate of the middle ear and the eardrum and the oval window of size than into significantly with the positive. (P lt; 0.001; r = 0.993; n = 8), but the length of the handle of the malleus and incus long sudden the ratio correlation is not significant with (P gt; 0.05; r = -0.29; n = 9); (3) the Bat Echolocation clocked tympanic membrane area (P lt; 0.01; r = -0.978; n = 21), tympanic membrane and oval window area ratio (P lt; 0.001; r = -0.895 ; n = 10) and middle ear conversion rate (P lt; 0.001; r = -0.901; n = 9) has a clear negative correlation, but the ratio of the length of the handle of the malleus and incus amacrine not significantly (P gt; 0.05; r = 0.328; n = 17). Chapter II of this article, in free field conditions, using extracellular recording method, observed 15 juvenile Kunming mice (3-4 weeks old) were inferior colliculus neurons FM sound reaction. The experiments were recorded 112 inferior colliculus neurons, and found that: (1) juvenile mice with a higher proportion of time-selective neurons pass. Schedule selectivity (75%), most of the neurons of the pure tone and band-pass neurons accounted for 36% of the short-pass neurons accounted for 32%, long-pass neurons accounted for 3%; (2) nerve Yuan FM sound sweep direction selectivity by FM sound modulation range and time. Determines the sound when 32ms, the modulation range is changed with the increase of the modulation range, and direction selectivity, the proportion of neurons also incrementally from the modulation range of 2kHz when 16% increments to 52% at 32kHz; in determining swept bandwidth of 32kHz, change FM sound when the proportion of the neurons with the increase of the sound when the process, the direction selectivity is also incrementally increased gradually from 4ms to 21% to 50% of the 32ms time. (3) The the neurons selective modulation rate schedule selective. Most of the neurons in the modulation range (79%), the modulation rate selectivity performance consistent long pass accounted for 35%, the bandpass type accounted for 30%, short pass accounted for 1% of the all-pass type accounted for 12% ; modulation rate is only a small part of the neuron neurons selectively change belongs to, change type neurons (21%). The comparison bat middle ear structural features and their echolocation sonic frequency, we found that the bat's eardrum, listen closely linked between small bone to their echolocation sonic frequency. In addition, young mice mound presence of a high percentage of FM sound direction selectivity and modulation rate selective neurons, Therefore, we hypothesized that the the animal auditory peripheral organs and the auditory center may listen to the sound of the FM and animal behavior .

The Research on the Relationship between Dominant Frequent and Middle Ear Structure of Bats and the Selectivity of Infancy Mice’s Inferior Colliculus for Frequent-Modulated Sound

Abstract

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