Berg K M
Institute for Advanced Study of the Communication Processes, University of Florida, Gainesville 32611.
Percept Psychophys. 1993 Sep;54(3):365-9. doi: 10.3758/bf03205272.
Behavioral thresholds of 6-month-old infants and adults were determined for 1/3-octave filtered clicks and 300-msec noise bursts with center frequencies ranging from .5 to 8 kHz. For noise bursts, differences between infant and adult thresholds were largest at low frequencies and smallest at 8 kHz. For clicks, infants' thresholds were most like adults' at 4 kHz, and age differences increased at both lower and higher frequencies. Differences between click and noise thresholds were significantly larger for infants than for adults at .5, 1, and 8 kHz, but not at 2 and 4 kHz. These results suggest that improvements in threshold for long-duration stimuli during infancy may not be accompanied by comparable changes in threshold at short durations. The delayed development of sensitivity to low- and high-frequency clicks appears consistent with maturational trends recently described for the auditory brainstem response.
针对中心频率范围为0.5至8千赫兹的1/3倍频程滤波短声和300毫秒噪声脉冲，测定了6个月大婴儿和成年人的行为阈值。对于噪声脉冲，婴儿和成年人阈值之间的差异在低频时最大，在8千赫兹时最小。对于短声，婴儿在4千赫兹时的阈值最接近成年人，在更低和更高频率时年龄差异增大。在0.5、1和8千赫兹时，婴儿短声和噪声阈值之间的差异显著大于成年人，但在2和4千赫兹时并非如此。这些结果表明，婴儿期长时间刺激阈值的改善可能不会伴随着短时间刺激阈值的类似变化。对低频和高频短声敏感性的延迟发展似乎与最近描述的听觉脑干反应的成熟趋势一致。
