Lee D K, McGillis S L, Greenspan J D
Department of Neurosurgery, SUNY Health Science Center at Syracuse 13210, USA.
Somatosens Mot Res. 1996;13(1):67-71. doi: 10.3109/08990229609028913.
Fourteen healthy subjects (4 males, 10 females) were asked to localize a thermal stimulus applied to the left distal forearm. Two temperature-controlled probes (1,2-cm2 area each) were strapped to the forearm, separated by 8 cm. The probes were positioned in one of three ways: (1) longitudinally within the C6 dermatome, (2) longitudinally within the C8 dermatomes, and (3) transversely with one probe within the C6 and one probe within the C8 dermatome. For any given stimulus configuration, cooling stimuli were localized significantly better than warming stimuli. For both warming and cooling, the transdermatomal configuration (transversely separated probes) provided significantly better localization than the intradermatomal configuration (longitudinally separated probes). Thus, the anisotropy that has been described for tactile spatial acuity is also present for thermal localization. These results suggest that cutaneous somatotopic information is integrated similarly for both and thermal stimuli, but differently within versus across dermatomes.
14名健康受试者（4名男性，10名女性）被要求定位施加于左前臂远端的热刺激。两个温度可控的探头（每个面积为1×2平方厘米）被绑在前臂上，相距8厘米。探头以三种方式之一放置：（1）在C6皮节内纵向放置，（2）在C8皮节内纵向放置，（3）横向放置，一个探头在C6皮节内，另一个探头在C8皮节内。对于任何给定的刺激配置，冷却刺激的定位明显优于温热刺激。对于温热和冷却刺激，跨皮节配置（横向分开的探头）的定位明显优于皮节内配置（纵向分开的探头）。因此，触觉空间敏锐度中所描述的各向异性在热定位中也存在。这些结果表明，皮肤躯体定位信息在触觉和热刺激中以类似方式整合，但在皮节内和跨皮节时整合方式不同。
