Janal M N, Clark W C, Carroll J D
Department of Biopsychology, New York State Psychiatric Institute, New York 10032.
Somatosens Mot Res. 1993;10(1):31-9. doi: 10.3109/08990229309028821.
Individual-differences multidimensional scaling (INDSCAL) determined the dimensions underlying ratings of electrocutaneous stimuli, which ranged from innocuous levels to individual pain intolerance at each of three frequencies. Twenty-five healthy males made pairwise similarity judgments of these 15 stimuli for the INDSCAL procedure, and then rated each stimulus on nine property scales. Signal detection theory indices, as well as ratings on the McGill Pain Questionnaire (MPQ), were also obtained. A Sensory Magnitude dimension scaled the stimuli from lowest to highest perceived intensity; this dimension was related to sensory, affective, and arousal property scales. A Frequency dimension ordered the stimuli from lowest to highest frequency; this dimension was related to the Fast-Slow property. Compared to the Frequency dimension, the Sensory Magnitude dimension was more salient to subjects who better discriminated among painful stimulus intensities, set a more stoical pain report criterion, and were less apt to endorse frequency-related MPQ descriptors. Thus, variation of physical intensity and frequency elicited complementary dimensions of subjective judgment, which were related to perceptual and attitudinal differences among individuals.
个体差异多维标度法（INDSCAL）确定了皮肤电刺激评级背后的维度，这些刺激的强度范围从无害水平到三种频率下各自的个体疼痛耐受程度。25名健康男性针对INDSCAL程序对这15种刺激进行了成对相似性判断，然后在九个属性量表上对每种刺激进行评分。还获得了信号检测理论指标以及麦吉尔疼痛问卷（MPQ）的评分。一个感觉强度维度将刺激从最低到最高感知强度进行标度；这个维度与感觉、情感和唤醒属性量表相关。一个频率维度将刺激从最低到最高频率进行排序；这个维度与快-慢属性相关。与频率维度相比，感觉强度维度对于那些能更好地区分疼痛刺激强度、设定更坚忍的疼痛报告标准且不太倾向于认可与频率相关的MPQ描述词的受试者更为显著。因此，物理强度和频率的变化引发了主观判断的互补维度，这与个体之间的感知和态度差异有关。
