SPATIOTEMPORAL INTEGRATION OF TOUCH AND PAIN INFORMATION : INTERACTION OF ADAPTATION, SUMMATION, AND INHIBITION

在第一个疼痛实验中，我们研究了焦虑和注意力对机械压力和皮肤电脉冲序列引起的疼痛等级的影响。对于压力，在安全指示下观察手臂的情况下，作为试验的函数，平均疼痛等级比在其他条件下增加得更快。对于电刺激，在焦虑指示下观看搞笑节目的情况下，疼痛等级随试验的增加而增加，而在其他情况下，疼痛等级随试验的减少而减少。我们提出了一个试验性模型，该模型基于受试者在经历疼痛之前对有害刺激的预期与经历疼痛时对有害刺激的视觉体验之间的差异。在第二个疼痛实验中，我们使用热（热）和冷刺激，制作了冷热量表和疼痛量表。温量表的幂指数为3.12，冷量表的幂指数为1.77。温（热）痛量表的斜率大于冷痛量表。在测量振动触觉阈值的实验中，使用皮肤的切向振动并研究机械感受机制以产生切向阈值曲线。进行了三个实验。切向振动的阈值曲线形状与正常振动的阈值曲线形状不同。当刺激频率在100 ~ 500 Hz之间时，正切阈值曲线与正切阈值曲线相似，均呈u型。而在50 Hz以下，切向阈值曲线的斜率比正常曲线陡。从实验结果可以推测，当刺激频率低于50 Hz时，SA II决定了切向阈值曲线的形状。

In the first experiment of pain, we investigated the effect of anxiety and attention on ratings of pain, which was induced by mechanical pressure and electrocutaneous pulse trains. For pressure, in the condition of watching the arm under the safety instructions, the mean pain rating increased more rapidly, as a function of trial, than it did in other conditions. For electrical stimulation, in the condition of watching the funny program under the anxiety instructions, the pain rating increased as a function of trial, whereas in the other conditions, it decreased as a function of trial. We proposed a tentative model, which is based on the discrepancy between the subject's anticipation of noxious stimuli before experiencing pain and the visual experience of it while experiencing pain.In the second experiment of pain, we used warm (heat) and cold stimuli and produced warm and cold scales and pain scales. The power exponent of warm scale was 3.12 and that of cold scale was 1.77. The slope of warm (heat) pain scale was steeper than that of cold one.In the experiments to measure vibrotactile thresholds, tangential vibrations to the skin were used and mechanoreceptive mechanisms was investigated to produce the tangential-threshold curve. Three experiments were performed. The shape of the threshold curve for the tangential vibrations was different from the shape for the normal ones. When the stimulus frequency was between 100 and 500 Hz, the normal-and tangential-threshold curves were similar to each other, and both of them were U-shaped. Below 50 Hz, however, the slope of the tangential-threshold curve was steeper than that of the normal one. It was supposed from the results of Experiments that the SA II determines the shape of the tangential-threshold curve when the stimulus frequency was lower than 50 Hz.