Berg B G, Nguyen Q T, Green D M
Psychology Department, University of Florida, Gainesville 32611.
J Acoust Soc Am. 1992 Oct;92(4 Pt 1):1911-8. doi: 10.1121/1.405238.
The ability to detect changes in the spectral shape of narrow-band tonal complexes (spectral profiles) is examined. The standard consists of three tones of equal intensity; thresholds for detecting an increment in the level of the central, 1000-Hz tone are estimated. A roving-level procedure is used in order to impose a statistical limit on thresholds that can be obtained by basing discriminations on absolute intensity. Estimated thresholds are consistently below this limit, thus indicating the use of other cues. Generally, thresholds are constant for bandwidths ranging from less than a critical band to greater than several octaves. Spectral weight estimates, however, are highly dependent on bandwidth, providing evidence that the discrimination of narrow-band spectra involves different auditory processes than those used to discriminate wideband spectra. Additional data show that pitch cues are important within a restricted range of intermediate bandwidth, but not for wideband or very narrow-band spectra. A version of the EWAIF model involving off-frequency listening is proposed to account for the results.
研究了检测窄带音调复合体（频谱轮廓）频谱形状变化的能力。标准由三个强度相等的音调组成；估计检测中心1000赫兹音调电平增量的阈值。使用游动电平程序以便对通过基于绝对强度进行辨别而获得的阈值施加统计限制。估计的阈值始终低于此限制，从而表明使用了其他线索。一般来说，对于小于一个临界带宽到大于几个八度的带宽，阈值是恒定的。然而，频谱权重估计高度依赖于带宽，这表明窄带频谱的辨别涉及与用于辨别宽带频谱不同的听觉过程。额外的数据表明，音高线索在中间带宽的受限范围内很重要，但对于宽带或非常窄带的频谱则不然。提出了一个涉及偏离频率聆听的EWAIF模型版本来解释这些结果。
