Electrophysiological experiment : in 73 rats , extracellular recordings in vivo were made from pvn using 3 - barrel microelectrode . neurons were categorized as gastric distension excitatory ( gd - e ) or inhibitory ( gd - i ) neurons tested with gastric distension stimulus . drugs were applied through the 3 - barrel microelectrode by a 4 - programmable pressure injector ( pm2000b , mdi , usa ) : relin , saline ( control group ) relin , " [ d - lys - 3 ] - ghrp - 6 ( antagonist for ghrelin - r ) , to observe the effects of drugs on the neuron discharge 电生理实验方法：在73只大鼠中，应用三管玻璃微电极细胞外记录麻醉大鼠一侧pvn神经元自发放电，用水囊充盈胃鉴别胃扩张敏感神经元( gdsn ) ，以压力注射仪( pm2000b ， mdi ， usa )经三管玻璃微电极，对核团内中文摘要单个神经元分别微量注射给予: ghrelin 、生理盐水ns (对照) ghrelin 、 d一lys一3 ]一ghrp一6 ( ghrelin受体拮抗剂) ，观察药物对神经元单位放电的影响。
According to the nonlinear dynamical features of isi series , the firing pattern can be described as : ( 1 ) periodic firing pattern , which was characterized by repeated appearance of isi at regular interval . ( 2 ) bursting firing pattern , which was characterized by bursting interrupted by silent periods . isis of the action potential during the bursts were confined to a banding area 在观察到的101例损伤drg神经元自发放电中，依据其动作电位isi的动力学特征，可分为周期，其isi基本相等；阵发，在短阵放电之间有不规则的间断；不规则，其isi互不相等；整数倍，其isi为基础isi第四军医大学硕士论文的整数倍等四种基本型式。
In this paper , we studied the deterministic mechanism of isi with the unstable period orbit ( upo ) ; we tested many isi data from different model with the method of approximate entropy ( apen ) to study the method which is used in testing the degree of complicacy of isi and we built up a system including hardware and software for our lab to view and record action potential , firing frequency and isi in real time . results 1 . spontaneous firing patterns were observed from neurons of supraoptic nucleus ( son ) in hypothalamus with the method of patch clamp 本研究通过对大鼠视上核神经元自发放电的非稳定周期轨道的计算，讨论了isi的确定性问题；利用近似熵的方法对多种神经放电的isi资料进行了复杂度的测量，讨论了这种方法在isi的复杂度测量第四军医大学硕士论文中的应用；另外，还开发出一套记录原始放电和isi的程序，解决了采集isi的问题。
