四十年代开始利用诱发电位为指标测定外周神经在大脑皮层的投射。Woolsey等刺激猫的躯体神经在对侧皮层后乙状回记录到诱发电位,认为后乙状回为躯体神经投射区,称之为体感区(体感皮层)。后肢神经投射在十字沟与钩状沟之间靠内侧部位。后来Amassian等又发现猫的内脏大神经也投射到后乙状回靠近钩状沟的躯干投射区。但两种诱发电位的分布关系不明确,两种投射的空间关系不清楚。本实验分别刺激内脏大神经和坐骨神经, Forty years began to use the evoked potential as an indicator of peripheral nerve projection in the cerebral cortex. Woolsey so stimulate the cat’s somatic nerve in the contralateral cortex after evacuation recorded evoked potentials that post-sigmoid back as the somatic nerve projection area, called the somatosensory area (somatosensory cortex). Hindlimb nerves project on the medial site between the cross and the hook. Later, Amassian, etc. also found that the cat’s visceral nerve is also projected to the posterior sigmoid back near the hook groove of the trunk projection area. However, the distribution of the two evoked potentials is not clear, and the spatial relationship between the two projections is not clear. This experiment separately stimulated the visceral nerve and sciatic nerve,