Discrimination of frequency glides with superimposed random glides in level.
Discrimination of frequency glides with superimposed random glides in level.
复制标题
频率滑移与电平中叠加的随机滑移的鉴别。
DOI：
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发表时间：
1998
影响因子：
2.4
通讯作者：
A. Sęk
中科院分区：
文献类型：
--
作者：
B. Moore;A. Sęk
这些实验旨在检验这样一种假设，即通过监测激发模式低频一侧的激发水平的变化来检测和区分频率的滑动。测量阈值，以检测不同标准范围(过渡跨度)的频率下滑程度的增加。每个刺激的中心频率被移动，以防止受试者使用刺激的开始或结束频率作为提示。电平或者固定在70dBSPL，或者在分贝/S内线性变化，改变幅度和方向随机变化的量，使滑动中点的电平保持在70dBSPL。这些随机的水平变化旨在干扰基于对兴奋模式一侧的兴奋水平变化的监测的线索。在某些情况下，表现太好，不能用受试者监测刺激的开始或结束频率来解释。表现也太好了，不能用对激发模式一侧激发水平变化的辨别来解释。阈值表示为听觉过滤器的等效矩形带宽(ERB)的比例，并不随中心频率(0.5、2或6 kHz)变化很大，这表明辨别能力并不强烈依赖于来自锁相的信息。滑行持续时间(50或400ms)和滑行方向(向上或向下)也几乎没有影响。当标准转换跨度超过0.5ERB时，阈值随标准转换跨度的增加而增加。结论是，滑移幅度本身的变化是可以区分的，但这不是通过监测激励模式的一侧来实现的。
These experiments were designed to test the hypothesis that glides in frequency are detected and discriminated by monitoring changes in excitation level on the low-frequency side of the excitation pattern. Thresholds were measured for detecting an increase in the extent of a frequency glide, for various standard extents (transition spans). The center frequency of each stimulus was roved, to prevent subjects from using the start or endpoint frequencies of the stimuli as cues. The level was either fixed at 70 dB SPL, or changed linearly in dB/s by an amount that varied randomly in extent and direction, keeping the level at the midpoint of the glide at 70 dB SPL. These random changes in level were intended to disrupt cues based on monitoring changes in excitation level on one side of the excitation pattern. For some conditions, performance was too good to be explained by subjects monitoring the start or endpoint frequencies of the stimuli. Performance was also too good to be explained in terms of the discrimination of changes in excitation level on one side of the excitation pattern. Thresholds, expressed as a proportion of the equivalent rectangular bandwidth (ERB) of the auditory filter, did not vary greatly with center frequency (0.5, 2, or 6 kHz), suggesting that discrimination did not depend strongly on information derived from phase locking. Glide duration (50 or 400 ms) and glide direction (upward or downward) also had little effect. Thresholds increased with increasing standard transition span, when that span was increased beyond 0.5 ERB. It is concluded that changes in glide extent per se can be discriminated, but this is not done by monitoring just one side of the excitation pattern.
DOI：
10.1121/1.420346
发表时间：
1997-11
期刊：
The Journal of the Acoustical Society of America
影响因子：
--
作者：
J. P. Madden;K. M. Fire
通讯作者：
J. P. Madden;K. M. Fire