A ratio code for vibrotactile pitch.
A ratio code for vibrotactile pitch.
复制标题
振动触觉音高的比率代码。
DOI：
10.1080/08990229870862
复制
发表时间：
1998
期刊：
影响因子：
--
通讯作者：
Hollins,M
中科院分区：
文献类型：
--
作者：
Roy,EA;Hollins,M
采用自由幅度估计法测量了四名受试者对80种不同正弦振动触觉刺激的主观音高印象。在三个受试者中，给定频率下的音高随着刺激幅度的增加而降低。基于三个主要触觉通道的相对激活水平的音调模型很好地描述了这些受试者的数据。该模型的主要元素是P通道活性与P、NPI和NPIII通道活性水平之和的比率。通道的活动水平是在心理物理学文献的基础上估计的，包括使用与本文相同的受试者和刺激对振动触觉响度的研究。第四名受试者的响度判断模式与其他受试者不同，不符合这个音高模型：她的数据显示，音高随着振幅的增加而显著增加，似乎反映出无法通过振动触觉通道将信号结合起来。振动触觉适应引起的音高变化与我们的比例模型方向一致：在25 Hz的刺激下，音高略有增加，在200 Hz的刺激下，音高略有下降。
Subjective impressions of pitch for 80 different sinusoidal vibrotactile stimuli delivered to the index finger were measured by free magnitude estimation in four subjects. In three of the subjects, pitch at a given frequency decreased as stimulus amplitude increased. The data of these subjects were well described by a model of pitch based on the relative levels of activation of the three major tactile channels. The main element in this model was a ratio of P channel activity to the sum of the activity levels of the P, NPI, and NPIII channels. Activity levels of the channels were estimated on the basis of the psychophysical literature, including a study of vibrotactile loudness using the same subjects and stimuli as those employed here. A fourth subject, whose pattern of loudness judgments had previously been shown to differ from those of the other subjects, did not conform to this pitch model: her data revealed significant increases in pitch with increases in amplitude, and appear to reflect an inability to combine signals across vibrotactile channels. Pitch changes resulting from vibrotactile adaptation were directionally consistent with our ratio model: pitch was slightly increased by adaptation to a 25 Hz stimulus, and slightly decreased by 200 Hz adaptation.