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疼痛等级的影响，这是由机械压力和皮肤电脉冲序列引起的。对于压力，在安全指示下观察手臂的条件下，平均疼痛等级作为试验的函数，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条件下，疼痛等级随着尝试的增加而增加，而在其他条件下，疼痛等级随着尝试的增加而降低。在第二个疼痛实验中，我们使用了热(热)和冷刺激，并产生了热刺激和冷刺激，产生了冷热刺激和疼痛等级。暖标度指数为3.12，冷标度指数为1.77。热(热)痛度的斜率比冷(热)痛度的斜率更大。在振动触觉阈值测量实验中，使用皮肤的切向振动，并研究了机械感受器的机械感受机制，以产生切线-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。当刺激频率为100~500 Hz时，正常阈值和切向阈值曲线相似，均呈U型。然而，在50赫兹以下，切线-阈值曲线的斜率比正常的更陡峭。从实验结果推测，当刺激频率低于50赫兹时，SA II决定了切线-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.