Northeastern University, Boston, MA, USA.
J Speech Lang Hear Res. 2011 Jun;54(3):981-94. doi: 10.1044/1092-4388(2010/10-0196). Epub 2010 Nov 8.
The purpose of this study was to investigate musical timbre perception in cochlear-implant (CI) listeners using a multidimensional scaling technique to derive a timbre space. Methods Sixteen stimuli that synthesized western musical instruments were used (McAdams, Winsberg, Donnadieu, De Soete, & Krimphoff, 1995). Eight CI listeners and 15 normal-hearing (NH) listeners participated. Each listener made judgments of dissimilarity between stimulus pairs. Acoustical analyses that characterized the temporal and spectral characteristics of each stimulus were performed to examine the psychophysical nature of each perceptual dimension.
For NH listeners, the timbre space was best represented in three dimensions, one correlated with the temporal envelope (log-attack time) of the stimuli, one correlated with the spectral envelope (spectral centroid), and one correlated with the spectral fine structure (spectral irregularity) of the stimuli. The timbre space from CI listeners, however, was best represented by two dimensions, one correlated with temporal envelope features and the other weakly correlated with spectral envelope features of the stimuli.
Temporal envelope was a dominant cue for timbre perception in CI listeners. Compared to NH listeners, CI listeners showed reduced reliance on both spectral envelope and spectral fine structure cues for timbre perception.
本研究旨在使用多维标度技术来推导音色空间，以调查人工耳蜗（CI）使用者对音乐音色的感知。方法：使用 16 种合成西方乐器的刺激物（McAdams、Winsberg、Donnadieu、De Soete 和 Krimphoff，1995）。8 名 CI 使用者和 15 名正常听力（NH）使用者参与了研究。每位聆听者对刺激对之间的差异进行判断。对每个刺激的时间和频谱特征进行了声学分析，以检查每个感知维度的心理物理性质。结果：对于 NH 聆听者，音色空间在三个维度上得到了最佳表示，一个维度与刺激的时间包络（对数起始时间）相关，一个维度与频谱包络（频谱质心）相关，一个维度与刺激的频谱精细结构（频谱不规则性）相关。然而，CI 使用者的音色空间则由两个维度表示，一个维度与时间包络特征相关，另一个维度与刺激的频谱包络特征弱相关。结论：时间包络是 CI 使用者对音色感知的主要线索。与 NH 聆听者相比，CI 使用者对音色感知的依赖程度降低，对频谱包络和频谱精细结构线索的依赖程度降低。
