Functional properties of burster-driving neurons in the cat.

单个单位记录从爆发驱动神经元（BDNs）的前置舌下核和背内侧网状结构尾侧的展神经核在aleart猫。BDNs被确定为激活从对侧前庭神经短潜伏期，II型反应水平头旋转，和特征性的放电模式在前庭眼震。在对侧头部旋转的反应，在每个快速阶段的活动指向对侧后，紧张II型活动在缓慢的阶段，脑源性神经元表现出爆发。在对侧扫视过程中，BDNF也表现出爆发。爆发中的棘波数与眼动水平分量的幅度密切相关。同样，内爆发放电率与对侧方向的水平眼速度有关。在同侧的快速阶段和扫视，BDNF倾向于降低其放电率。当眼球震颤不存在时，脑源性神经元对0.05-0.5 Hz正弦头部旋转的放电反应与头部速度大致同相。在注视过程中，BDNF的放电频率与眼位无关。即使在没有观察到眼球运动的情况下，BDNF也会以突发的方式增加其放电率，以响应向对侧移动的视觉刺激。刺激同侧上级丘后，BDNF被多突触激活。在对侧头旋转过程中，该反应被促进，在同侧旋转过程中被抑制，表明顶盖和前庭输入对BDNF的会聚。HRP细胞内注射到确定的BDNF显示其对侧的轴突投射和躯体位置的腹侧缘的前置舌下核和相邻的网状结构。

Single unit recordings were made from burster-driving neurons (BDNs) in the prepositus hypoglossi nucleus and the underlying dorsomedial reticular formation caudal to the abducens nucleus in the aleart cat. BDNs were identified by their activation from the contralateral vestibular nerve with short latency, type II response to horizontal head rotation, and characteristic firing pattern during vestibular nystagmus. In response to contralateral head rotation, BDNs exhibited a burst of activity at each quick phase directed to the contralateral side following a tonic type II activity during the slow phase. BDNs exhibited bursts during contralateral saccades as well. The number of spikes in the burst was closely correlated with amplitude of horizontal component of eye movements. Similarly, intra-burst firing rate was related to horizontal eye velocity in the contralateral direction. During ipsilateral quick phases and saccades, BDNs tended to decrease their firing rate. When nystagmus was absent, firing responses of BDNs to sinusoidal head rotations at 0.05-0.5 Hz were approximately in phase with head velocity. The firing rate of BDNs during fixation was not correlated with eye position. BDNs increased their firing rate in a burst fashion in response to visual stimuli moving to the contralateral side even when no eye movements were observed. BDNs were polysynaptically activated following stimulation of the ipsilateral superior colliculus. The response was facilitated during contralatral head rotation and supressed during ipsilateral rotation, indicating convergence of tectal and vestibular inputs on BDNs. Intracellular injection of HRP into identified BDNs revealed their contralateral axonal projection and somatic location on the ventral border of the prepositus hypoglossi nucleus and the adjacent reticular formation.