Developmental changes in chickens' masked thresholds.
Developmental changes in chickens' masked thresholds.
复制标题
鸡的掩蔽阈值的发育变化。
DOI：
10.1002/dev.420260803
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发表时间：
1993
影响因子：
2.2
通讯作者：
Gray,L
中科院分区：
文献类型：
--
作者：
Gray,L
在0和4日龄的100多只鸡中，在三种宽带噪声水平(大约0、10和20分贝/赫兹)下，估计了四种频率(0.25、0.5、1和2千赫)的掩蔽阈值。一种适应性程序是基于当雏鸟在背景噪音中听到音调时发生的持续窥视的延迟。出生后即刻，掩蔽阈值平均每天降低1分贝。这种敏感度的提高更可能是由于非感觉因素，类似于人类新生儿的分心掩蔽，而不是频率分辨率的提高。这些新生儿的掩蔽阈值在其他方面受到频谱水平和频率的影响，与成熟受试者的反应相同：掩蔽者的频谱水平每增加1分贝，阈值就增加近1分贝，每八度频率大约增加3分贝。因此，尽管受到一些非感官效应的影响，新生雏鸟的掩蔽阈值与人类的阈值相似。©1993 John Wiley&Sons Inc.
Masked thresholds were estimated at four frequencies (.25, .5, 1, and 2 kHz) in three levels of broadband noise (approximately 0, 10, and 20 dB/Hz) in over 100 chickens at 0 and 4 days of age. An adaptive procedure was based on delays in ongoing peeps that occurred when chicks heard the tones over the background noise. Masked thresholds decreased an average of 1 dB per day immediately after birth. This increasing sensitivity is more likely due to nonsensory factors, similar to distraction masking reported in human neonates, than to improving frequency resolution. Masked thresholds in these neonates are otherwise affected by spectrum level and frequency in the same way as the responses of mature subjects: thresholds increase by nearly 1 dB for each dB of increase in the spectrum level of the masker, and by approximately 3 dB for each octave of frequency. Thus, although elevated by some nonsensory effect, masked thresholds in newborn chicks are similar to those in humans. © 1993 John Wiley & Sons Inc.