A large proportion of the bat ' s auditory receptors ( hair cells in the cochlea ) and large areas in the bat ' s brain are devoted to analyzing a narrow frequency range corresponding to a single harmonic of the returning echo 蝙蝠用很大一部分的听觉受器（耳蜗中的毛细胞）与大幅的脑部区域，来分析一段?围狭窄的频率，该频率正与回声的一个谐波相符。
