Neuroscience Training Program and Department of Physiology and Biophysics, University of Colorado School of Medicine, Aurora, Colorado 80045, USA.
J Acoust Soc Am. 2011 Jul;130(1):EL38-43. doi: 10.1121/1.3601881.
The development of sound-evoked responses in Chinchilla lanigera was studied from postnatal ages P0-1 (first 24 h) to adult. Cochlear microphonic (CMs) and compound action potentials (CAPs), representing ensemble sound-evoked activities of hair cells and auditory nerve fibers, respectively, were present as early as age P0-1. The data indicate that CM thresholds and sensitivities were generally adult-like (i.e., fall into adult ranges) at birth, but suprathreshold CM amplitudes remained below adult ranges through P28. CAP thresholds reached adult-like values between P7-P14, but the suprathreshold CAP amplitude continued to increase until ∼P28. The results confirm the auditory precociousness of the chinchilla.
对幼年栗鼠（Chinchilla lanigera）从出生后 0-1 天（最初 24 小时）到成年的声诱反应发育进行了研究。耳蜗微音器电位（CMs）和复合动作电位（CAPs）分别代表毛细胞和听神经纤维的整体声诱活性，早在出生后 0-1 天就存在。数据表明，CM 阈值和灵敏度在出生时通常类似于成年（即落入成年范围），但超阈值 CM 幅度在 P28 之前仍低于成年范围。CAP 阈值在 P7-P14 之间达到成年水平，但超阈值 CAP 幅度持续增加直到约 P28。结果证实了栗鼠的听觉早熟。
