Schneider B A, Morrongiello B A, Trehub S E
Department of Psychology, University of Toronto, Mississauga, Ontario, Canada.
J Exp Psychol Hum Percept Perform. 1990 Aug;16(3):642-52. doi: 10.1037//0096-1523.16.3.642.
Masked thresholds at two signal frequencies (0.8 and 4 kHz) were obtained from listeners aged 6.5 months, 2 years, 5 years, and 20.5 years in the presence of constant spectrum level, narrowband maskers of differing bandwidths. Consistent with the classical results of Fletcher (1940), masked threshold for all age groups increased with bandwidth up to a critical width, beyond which further increases in bandwidth were ineffective in increasing threshold. These critical widths (estimates of critical band size) did not change substantially with age (critical widths for infants were no more than 50% larger than those of adults) despite substantial changes in masked thresholds with age. Thus, contrary to previous claims, changes in auditory filter width cannot account for developmental changes in masked or absolute thresholds.
在恒定频谱水平下，针对6.5个月、2岁、5岁和20.5岁的听众，使用不同带宽的窄带掩蔽音，获得了两个信号频率（0.8千赫和4千赫）下的掩蔽阈值。与弗莱彻（1940年）的经典结果一致，所有年龄组的掩蔽阈值随带宽增加，直至达到一个临界宽度，超过该宽度后，带宽的进一步增加对提高阈值无效。尽管掩蔽阈值随年龄有显著变化，但这些临界宽度（临界带宽大小的估计值）并未随年龄发生实质性变化（婴儿的临界宽度比成年人的临界宽度大不超过50%）。因此，与之前的说法相反，听觉滤波器宽度的变化不能解释掩蔽阈值或绝对阈值的发育变化。
