HEAT-INDUCED PAIN DIMINISHES VIBROTACTILE PERCEPTION - A TOUCH GATE
HEAT-INDUCED PAIN DIMINISHES VIBROTACTILE PERCEPTION - A TOUCH GATE
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DOI：
10.3109/08990229409051393
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发表时间：
1994-01-01
影响因子：
0.9
通讯作者：
BOLANOWSKI, SJ
中科院分区：
文献类型：
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作者：
APKARIAN, AV;STEA, RA;BOLANOWSKI, SJ
疼痛的门控制理论（Melzack和Wall， 1965）认为触觉刺激可以减少疼痛的感知。我们发现了相反的效果：引起疼痛的热量水平可以极大地抑制触觉敏感性，而不受注意力或觉醒的变化的影响。10名人类观察者被同时呈现在右鱼际隆起的强直性、产生疼痛的热刺激和振动触觉刺激（1、10和100 Hz）刺激。在31摄氏度的标准温度和更高的温度下评估皮肤的振动触觉阈值。振动触觉阈值的增加（平均变化= 7.3 dB）发生在皮肤温度略低于或高于引起疼痛的皮肤温度时。此外，在相同的实验中确定的超阈震动触觉刺激的绝对大小估计显示敏感性降低和心理物理招募。这些变化不能归因于注意力或觉醒的变化，因为它们与听觉阈值的变化无关。此外，这些变化发生在受试者的痛觉阈值（痛觉感受器可能被激活的地方）以下。振动触觉敏感性的这种超过两倍的降低表明，能够引起疼痛的热刺激可以显着减少触觉，可能通过“触摸门”，以类似于提出的疼痛门控制理论的方式。
The gate control theory of pain (Melzack and Wall, 1965) suggests that tactile stimuli can decrease the perception of pain. We have found the reverse effect: Heat at levels that induce pain can substantially suppress tactile sensitivity, independently of shifts in attention or arousal. Ten human observers were stimulated by a tonic, pain-producing heat stimulus and vibrotactile stimuli (1, 10, and 100 Hz) coincidentally presented to the right thenar eminence. Vibrotactile thresholds were assessed with the skin at a normative temperature of 31 degrees C and at higher temperatures producing pain. Increases in vibrotactile thresholds (mean change = 7.3 dB) occurred at skin temperatures just below and above those that induced pain. Furthermore, absolute-magnitude estimates of suprathreshold vibrotactile stimuli determined during the same experiments showed decreased sensitivity and psychophysical recruitment. The changes are not attributable to attentional or arousal shifts, since they were not associated with changes in auditory thresholds. Furthermore, the changes occurred just below the subjects' pain thresholds (where nociceptors are presumably activated). This over-twofold diminution of vibrotactile sensitivity suggests that heat stimuli capable of inducing pain can significantly diminish taction, perhaps through a ''touch gate'' in a manner similar to the gate control theory proposed for pain.