Spatial summation of perceived pressure, sharpness and mechanically evoked cutaneous pain
Spatial summation of perceived pressure, sharpness and mechanically evoked cutaneous pain
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DOI：
10.1080/08990229771105
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发表时间：
1997-01-01
影响因子：
0.9
通讯作者：
McGillis, SLB
中科院分区：
文献类型：
--
作者：
Greenspan, JD;Thomadaki, M;McGillis, SLB
在精神病学上，空间总和可以表现为伴随刺激场增加的阈值降低。本研究探讨在何种程度上不同的机械诱发知觉（压力，锐度，疼痛）显示空间总和。使用各种探针对19名健康受试者的手指背侧表面施加规定的力。三种感知品质的阈值表现出不同程度的空间总和：锐度没有统计学意义的空间总和;疼痛表现出一些显著的总和（平均46%）;压力表现出最大程度的空间总和（平均76%）。锐度阈值缺乏显著的空间总和与知觉锐度可由单个伤害感受器的近阈值活动诱发的理论一致。适度的空间总和疼痛意味着，明显的阈上激活的伤害感受器所需的机械诱发的疼痛感知，和这样的输入汇总集中，但不完全。对于压力与疼痛阈值观察到的更大的空间总和意味着对于缓慢适应的机械感受器与伤害感受器的更大程度的中枢总和。
Psychophysically, spatial summation can be demonstrated as a decrease in threshold accompanying an increased field of stimulation. The present study examined to what extent different mechanically evoked percepts (pressure, sharpness, and pain) show spatial summation. Various probes were used to apply prescribed forces to the dorsal surface of the digits of 19 healthy subjects. The threshold fdr three perceptual qualities showed differing degrees of spatial summation: sharpness showed no statistically significant spatial summation; pain demonstrated some significant summation (46% on average); pressure showed the greatest degree of spatial summation (76% on average). The lack of significant spatial summation for sharpness threshold is consistent with the theory that perceived sharpness can be evoked by near threshold activity of a single nociceptor. The modest amount of spatial summation for pain implies that distinctly suprathreshold activation of nociceptors is required for mechanically evoked pain perception, and such input summates centrally, but not completely. The greater spatial summation observed for pressure vs. pain thresholds implies a greater degree of central summation for slowly adapting mechanoreceptors vs. nociceptors.