Molecular analysis of the effect of relative tone level on multitone pattern discrimination
Molecular analysis of the effect of relative tone level on multitone pattern discrimination
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DOI：
10.1121/1.2361184
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发表时间：
2006-12-01
影响因子：
2.4
通讯作者：
Jesteadt, Walt
中科院分区：
文献类型：
--
作者：
Lutfi, Robert A.;Jesteadt, Walt
分子心理物理学试图模拟观察者对刺激的反应，因为它们在不同的试验中有所不同。该方法在多音调模式识别研究中得到了普及，作为估计听众对模式中不同音调的相对依赖性或决策权重的一种手段。影响决策权重的各种因素已被检查，但在很大程度上被忽略的是模式中的音调的相对水平。在本研究中，听众检测到一个5100毫秒，2.0 kHz的短纯音序列的水平增量交替在40和80分贝SPL之间的水平。在40分贝的音调上，音量增量最大，尽管如此，所有四个高度熟练的听众几乎都只给80分贝的音调加权。当音调被交替变化的宽带高斯噪声脉冲所取代时，效果是相同的。只有当电平差小于10 dB时，它才能降低，只有当低电平音调与更大的高斯噪声脉冲交替时，它才能完全逆转。结果进行了讨论的感官和知觉因素的影响，估计决策权重。(c)2006年，美国声学学会。
Molecular psychophysics attempts, to model the observer's response to stimuli as they vary from trial to trial. The approach has gained popularity in multitone pattern discrimination studies as a means of estimating the relative reliance or decision weight listeners give to different tones in the pattern. Various factors affecting decision weights have been examined, but one largely ignored is the relative level of tones in the pattern. In the present study listeners detected a level-increment in a sequence of 5, 100-ms, 2.0-kHz tone bursts alternating in level between 40 and 80 dB SPL. The level increment was made largest on the 40-dB tones, yet despite this all four highly-practiced listeners gave near exclusive weight to the 80-dB tones. The effect was the same when the tones were replaced by bursts of broadband Gaussian noise alternating in level. It was reduced only when the level differences were made < 10 dB, and it was entirely reversed only when the low-level tones alternated with louder bursts of Gaussian noise. The results are discussed in terms of the effects of both sensory and perceptual factors on estimates of decision weights. (c) 2006 Acoustical Society of America.