Christensen L A, Humes L E
Department of Communication Disorders, Louisiana State University Medical Center, New Orleans 70112, USA.
J Acoust Soc Am. 1996 Apr;99(4 Pt 1):2307-15. doi: 10.1121/1.415418.
The present series of experiments examined the ability of normal-hearing listeners to make use of cues from multiple, independent stimulus dimensions when classifying multidimensional complex sounds. Ten listeners classified complex sound pulses that differed along three independent dimensions. The stimuli were 100 ms in duration and were synthesized using five simultaneous sinusoids. The three dimensions of the complex stimuli manipulated in this experiment were harmonicity, spectral shape, and amplitude envelope. Each stimulus dimension could take on one of two values, referred to here as target or nontarget. Eight stimuli were synthesized using all possible combinations of the dimension values. Subjects were trained to label two stimuli, the two having either all-target or all-nontarget values, as "+" and "0," respectively. Following this training, subjects were asked to classify all eight stimuli as either "+" or "0." Results of this experiment indicated that listeners preferred to classify these stimuli on the basis of one stimulus dimension. However, the preferred dimension was not the same for all of the listeners. In addition, it was demonstrated that it was possible to train an individual to use a dimension other than the one or two initially preferred when classifying the stimuli.
本系列实验研究了听力正常的听众在对多维复杂声音进行分类时，利用来自多个独立刺激维度线索的能力。十名听众对沿三个独立维度不同的复杂声脉冲进行了分类。刺激持续时间为100毫秒，由五个同时出现的正弦波合成。本实验中操纵的复杂刺激的三个维度是谐波性、频谱形状和幅度包络。每个刺激维度可以取两个值之一，这里称为目标值或非目标值。使用维度值的所有可能组合合成了八个刺激。训练受试者将两个刺激分别标记为“+”和“0”，这两个刺激分别具有全目标值或全非目标值。经过这种训练后，要求受试者将所有八个刺激分类为“+”或“0”。该实验结果表明，听众倾向于基于一个刺激维度对这些刺激进行分类。然而，所有听众偏好的维度并不相同。此外，还证明了可以训练个体在对刺激进行分类时使用最初偏好的一个或两个维度之外的维度。
