Kidd G, Mason C R, Brantley M A, Owen G A
Department of Communication Disorders, Boston University, Massachusetts 02215.
J Acoust Soc Am. 1989 Oct;86(4):1310-7. doi: 10.1121/1.398745.
The detectability of tones, or of intensity increments to tones, in bands of random noise was measured for conditions in which the overall level was fixed or was randomly roved from interval to interval of every experimental trial. The purpose of the within-trial rove was to limit the usefulness of a detection strategy based on overall level or level within a single "critical band." At "supracritical" bandwidths, the functions relating masked threshold to noise bandwidth for the roved conditions were similar to those obtained when no rove was employed. At "subcritical" bandwidths, thresholds were higher in some roved conditions, but, for the largest rove, were still lower than would be predicted from arguments based purely on level detection--with one exception. A comparison of observer performance relative to the statistical limits imposed by the roving-level procedure indicated that the traditional critical-band energy-detector model could not account for the results, which are attributed to discrimination based on spectral shape or on waveshape.
在整体水平固定或在每次实验试验的不同间隔中随机变动的条件下，测量了随机噪声频段中音调或音调强度增量的可检测性。试验内变动的目的是限制基于整体水平或单个“临界频段”内水平的检测策略的有效性。在“超临界”带宽下，变动条件下将掩蔽阈值与噪声带宽相关联的函数与未采用变动时获得的函数相似。在“亚临界”带宽下，某些变动条件下的阈值较高，但对于最大的变动，仍低于仅基于水平检测的论点所预测的值——只有一个例外。将观察者的表现与变动水平程序所施加的统计限制进行比较表明，传统的临界频段能量检测模型无法解释这些结果，这些结果归因于基于频谱形状或波形的辨别。
