On the ability to discriminate Gaussian-noise tokens or random tone-burst complexes
On the ability to discriminate Gaussian-noise tokens or random tone-burst complexes
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DOI：
10.1121/1.2973184
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发表时间：
2008-10-01
影响因子：
2.4
通讯作者：
Kohlrausch, Armin
中科院分区：
文献类型：
--
作者：
Goossens, Tom;van de Par, Steven;Kohlrausch, Armin
本研究调查了影响听众在相同-不同辨别范式中辨别高斯噪声刺激能力的因素。第一个实验表明，歧视能力增加与带宽的噪声持续时间高达100毫秒。持续时间对性能有非单调的影响，与歧视性的刺激长于40毫秒的下降。进一步的实验研究了这种性能下降的原因。他们发现，当使用冷冻噪音标记和指导听众专注于刺激结尾时，辨别能力可以得到改善。最后一个实验，使用的刺激组成的5毫秒的汉宁窗的音调突发随机分布在一段时间内，研究是否刺激持续时间和信息量不同地影响听觉系统的处理能力。结果表明，在刺激的自由度的数量，而不是其持续时间，主要影响的能力，歧视。总的来说，结果表明，听觉刺激的辨别性能强烈依赖于每个关键频带的信息量和处理这些信息的能力。这种能力似乎在时间维度上是有限的，而将信号扩展到更多的听觉滤波器确实对性能有积极的影响。(c)2008年，美国声学学会。
This study investigated factors that influence a listeners' ability to discriminate Gaussian-noise stimuli in a same-different discrimination paradigm. The first experiment showed that discrimination ability increased with bandwidth for noise durations up to 100 ms. Duration had a nonmonotonic influence on performance, with a decrease in discriminability for stimuli longer than 40 ms. Further experiments investigated the cause for this performance decrease. They showed that discfiminability could be improved when using frozen-noise tokens and by instructing listeners to focus on the stimulus endings. A final experiment, using a stimulus consisting of 5 ms Hanning-windowed tone-bursts randomly distributed over time, investigated whether stimulus duration and amount of information differently affect the processing capacity of the auditory system. Results showed that the number of degrees of freedom in the stimulus, not its duration, predominantly influenced the ability to discriminate. Overall, the results suggest that the discrimination performance for acoustic stimuli depends strongly on the amount of information per critical band and the capacity to process this information. This capacity seems to be limited in the temporal dimension, while extending the signal over more auditory filters does have a positive effect on performance. (c) 2008 Acoustical Society of America.