VIBROTACTILE ADAPTATION ENHANCES FREQUENCY DISCRIMINATION
VIBROTACTILE ADAPTATION ENHANCES FREQUENCY DISCRIMINATION
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DOI：
10.1121/1.410314
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发表时间：
1994-08-01
影响因子：
2.4
通讯作者：
HOLLINS, M
中科院分区：
文献类型：
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作者：
GOBLE, AK;HOLLINS, M
采用双间隔强迫选择跟踪，在大鱼际隆起和食指垫上测量了人类振动触觉频率识别（相对于25 hz标准刺激，高于未适应检测阈值20 dB）。测量是在不适应状态下进行的，随后暴露于25赫兹的各种振幅的适应刺激。在每个适应条件下分别进行匹配实验的基础上，标准刺激和所有比较刺激的感知强度相等。当自适应刺激的幅值与标准幅值相等时，频差阈值最低。这一结果补充了早先的发现[A]。K. Goble和M. Hollins， J. Acoust。Soc。Am. 93, 418-424(1993)]表明，适应使与适应刺激相似的上刺激的振幅辨别更加尖锐。综上所述，这些发现表明，扩展刺激所涉及的体感机制有助于增强对该刺激的定量和定性特性变化的检测。
Human vibrotactile frequency discrimination (with respect to a 25-Hz standard stimulus, 20 dB above unadapted detection threshold) was measured on the thenar eminence and index fingerpad, using two-interval forced-choice tracking. Measurements were made in the unadapted state and following exposure to 25-Hz adapting stimuli of various amplitudes. The standard and all comparison stimuli were equated for perceived intensity, on the basis of matching experiments that were carried out separately under each adapting condition. Frequency difference thresholds were lowest when the amplitude of the adapting stimulus was equal to the amplitude of the standard. This result complements the earlier finding [A. K. Goble and M. Hollins, J. Acoust. Soc. Am. 93, 418-424 (1993)] that adaptation sharpens amplitude discrimination of supraliminal stimuli that are similar to the adapting stimulus. Taken together, these discoveries suggest that somatosensory mechanisms that are engaged by extended stimulation serve to enhance detection of changes in the properties, both quantitative and qualitative, of that stimulation.