Chang An-Chieh, Lutfi Robert A, Lee Jungmee
Auditory Behavioral Research Lab, Department of Communicative Disorders, University of Wisconsin, Madison, Wisconsin 53706, USA
J Acoust Soc Am. 2015 Dec;138(6):EL504-8. doi: 10.1121/1.4936981.
Stimulus uncertainty is known to critically affect auditory masking, but its influence on auditory streaming has been largely ignored. Standard ABA-ABA tone sequences were made increasingly uncertain by increasing the sigma of normal distributions from which the frequency, level, or duration of tones were randomly drawn. Consistent with predictions based on a model of masking by Lutfi, Gilbertson, Chang, and Stamas [J. Acoust. Soc. Am. 134, 2160-2170 (2013)], the frequency difference for which A and B tones formed separate streams increased as a linear function of sigma in tone frequency but was much less affected by sigma in tone level or duration.
已知刺激的不确定性会严重影响听觉掩蔽，但它对听觉流的影响在很大程度上被忽视了。通过增加正态分布的标准差（从中随机抽取音调的频率、声级或持续时间），标准的ABA-ABA音调序列的不确定性越来越大。与基于Lutfi、Gilbertson、Chang和Stamas [《美国声学学会杂志》134, 2160 - 2170 (2013)] 的掩蔽模型所做的预测一致，A音和B音形成独立流的频率差异随着音调频率标准差的线性函数增加，但受音调声级或持续时间标准差的影响要小得多。
