FREQUENCY AND INTENSITY DISCRIMINATION IN HUMAN INFANTS AND ADULTS
FREQUENCY AND INTENSITY DISCRIMINATION IN HUMAN INFANTS AND ADULTS
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DOI：
10.1121/1.392655
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发表时间：
1985-01-01
影响因子：
2.4
通讯作者：
ASLIN, RN
中科院分区：
文献类型：
--
作者：
SINNOTT, JM;ASLIN, RN
使用重复标准“是-否”操作转头技术和自适应楼梯（跟踪）心理物理程序，测量了 26 名人类婴儿（7-9 个月大）和 6 名年轻人的 DL 频率和强度。受试者在视觉上被强化，以应对持续的 1.0kHz 突发音调中的频率增加、频率减少、强度增加或强度减少的反应，并使用随机交错的探针和捕捉试验来监测刺激控制。婴儿很容易适应对频率的增加和减少做出反应，DL 范围为 11-29 Hz，而成人 DL 范围为 3-5 Hz。婴儿也很容易辨别强度增量，DL 范围为 3-12 dB，而成人 DL 范围为 1-2 dB。尽管成年人在这项任务上没有遇到任何困难并且产生了与增量类似的 DL，但没有婴儿成功地区分强度减量。婴儿明显无法区分强度衰减，这表明婴儿中枢神经系统可能无法很好地适应监测外周听觉神经元群体的衰减率。
Frequency and intensity DLs were measured in 26 human infants (ages 7-9 months) and six young adults using a repeating standard "yes-no" operant headturning technique and an adaptive staircase (tracking) psychophysical procedure. Subjects were visually reinforced for responding to frequency increments, frequency decrements, intensity increments, or intensity decrements in an ongoing train of 1.0-kHz tone bursts, and stimulus control was monitored using randomly interleaved probe and catch trials. Infants were easily conditioned to respond to both increments and decrements in frequency, and DLs ranged from 11-29 Hz, while adult DLs ranged from 3-5 Hz. Infants also easily discriminated intensity increments, and DLs ranged from 3-12 dB, while adult DLs ranged from 1-2 dB. No infants successfully discriminated intensity decrements, although adults experienced no difficulty with this task and produced DLs similar to those for increments. The apparent inability of infants to discriminate intensity decrements suggests that the infant CNS may not be well adapted to monitor rate decreases in populations of peripheral auditory neurons.