割破手指时,我们首先会感受到Aδ伤害系统所介导的定位明确的锐痛,然后很快被C伤害系统所产生的灼痛取代。红外激光脉冲能同时激活这两个系统,诱发一个首先是刺痛随后是更弥散、持续更长时间的C感觉的双重感知。但奇怪的是,在皮层诱发电位图上很难观察到反映这种双重感知的成分 When we cut our fingers, we first feel the acute sharp pain mediated by the Aδ injury system, which is quickly replaced by the burning sensation created by the C injury system. Infrared laser pulses activate both systems at the same time, inducing a dual perception of C-sensation that is first more stinging followed by a more diffuse, longer duration. However, it is strange that it is difficult to observe the components that reflect this dual perception on the cortical potentiometry