目的研究正常雪貂和自幼切除耳廓和部分外耳道的雪貂对水平方向声音的相对定位能力，研究耳廓外耳道对它的影响。方法在隔声消音测试仓中，首先通过训练建立动物听觉和行为的条件反射，然后测试记录动物对持续噪声反应的正确率，来分析两组动物在水平面正前方90°区域内和右前方90°区域内的声音定位。结果在水平面正前方180°区域内，两组动物均表现出基本相同的相对定位能力。尽管两组动物在正前方90°扇形区域要略好于右前方90°扇形区域，但都无统计学意义。结论实验表明耳廓和外耳道对水平方向的声音定位几乎无影响，也就是说在水平方向上的声音定位，耳廓和外耳道的滤波、共振等改变声波频谱特性作用可能不明显。%Objective To test both normal adult fenrrets and mature ferretswhose pinna and concha had been removed bilaterally in infancy for their ability to localize sound relatively in the horizontal plane. Methods The ferrets were first trained in a sound attenuated chamber which was with sound absorbing foam. Then all animals were tested for their response to speaker sound, and their ability to sound localization depending on the correct rate was evaluated. Results There was no significant difference between normal and abnormal animals. Conclusion This result shows that that the pinna and concha have almost no effect no sound localization in horizontal plane, which means spectral characteristic does not possihly dominate in horizorntal plane.
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