Shen Yi, Sivakumar Rajeswari, Richards Virginia M
Department of Cognitive Sciences, University of California, Irvine, 3151 Social Science Plaza, Irvine, California 92687-5100.
J Acoust Soc Am. 2014 Oct;136(4):1857-68. doi: 10.1121/1.4894785.
A Bayesian adaptive procedure, the quick-auditory-filter (qAF) procedure, was used to estimate auditory-filter shapes that were asymmetric about their peaks. In three experiments, listeners who were naive to psychoacoustic experiments detected a fixed-level, pure-tone target presented with a spectrally notched noise masker. The qAF procedure adaptively manipulated the masker spectrum level and the position of the masker notch, which was optimized for the efficient estimation of the five parameters of an auditory-filter model. Experiment I demonstrated that the qAF procedure provided a convergent estimate of the auditory-filter shape at 2 kHz within 150 to 200 trials (approximately 15 min to complete) and, for a majority of listeners, excellent test-retest reliability. In experiment II, asymmetric auditory filters were estimated for target frequencies of 1 and 4 kHz and target levels of 30 and 50 dB sound pressure level. The estimated filter shapes were generally consistent with published norms, especially at the low target level. It is known that the auditory-filter estimates are narrower for forward masking than simultaneous masking due to peripheral suppression, a result replicated in experiment III using fewer than 200 qAF trials.
一种贝叶斯自适应程序，即快速听觉滤波器（qAF）程序，被用于估计关于其峰值不对称的听觉滤波器形状。在三个实验中，对心理声学实验不熟悉的听众检测出一个固定电平的纯音目标，该目标与一个频谱带凹口的噪声掩蔽器一起呈现。qAF程序自适应地操纵掩蔽器频谱电平以及掩蔽器凹口的位置，这是为了有效估计听觉滤波器模型的五个参数而进行了优化。实验一表明，qAF程序在150至200次试验（大约15分钟完成）内对2千赫处的听觉滤波器形状提供了收敛估计，并且对于大多数听众而言，具有出色的重测信度。在实验二中，针对1千赫和4千赫的目标频率以及30和50分贝声压级的目标电平估计了不对称听觉滤波器。所估计的滤波器形状通常与已发表的标准一致，尤其是在低目标电平下。众所周知，由于外周抑制，前掩蔽的听觉滤波器估计比同时掩蔽更窄，这一结果在实验三中使用少于200次qAF试验得以重现。
