Poliakova A G, Khanashvili A A, Nabieva T N
Zh Vyssh Nerv Deiat Im I P Pavlova. 1985 May-Jun;35(3):510-9.
Evoked potentials to somatic and visual stimuli were recorded in the parafascicular complex (parafascicular nuclei--centrum medianum--Pf--CM) of the thalamus of cats anaesthetized by nembutal. Cooling of the motor cortex was also used. The influence of the motor cortex on processing of the visual and somatic afferent signals at the thalamic level was found to be direct but different by its character. The motor cortex exerted unidirectional facilitatory modulatory action of a tonic type on the processing of visual afferentation and general facilitatory influence against the background of which particular excitatory and inhibitory effects were seen which it exerted on the processing of somatic signals. Episodically the motor cortex completely controlled the afferent inputs activated by somatic impulses. The motor cortical area non-equally influenced afferentation of the same modality forming the different components of the evoked potentials in Pf--CM. On the base of our present and earlier obtained data an idea has been formed of existence of a general principle of differentiated influences of polysensory areas on heterogeneous afferentation on nonspecific and association thalamic nuclei, and of realization of these influences through separation of functionally isolated subsystems in descending pathways. Each of the subsystems by closing separate thalamo-cortical circuits might transmit signals of a single modality.
在戊巴比妥麻醉的猫的丘脑束旁复合体（束旁核 - 中央中核 - Pf - CM）中记录了对躯体和视觉刺激的诱发电位。还采用了冷却运动皮层的方法。发现运动皮层对丘脑水平的视觉和躯体传入信号处理的影响是直接的，但性质不同。运动皮层对视觉传入信息的处理具有单向的、紧张性的促进性调制作用，对躯体信号处理则在一般性促进影响的背景下呈现出特定的兴奋和抑制作用。运动皮层偶尔会完全控制由躯体冲动激活的传入输入。运动皮层区域对相同模态的传入信息产生不同程度的影响，形成Pf - CM中诱发电位的不同成分。基于我们目前和先前获得的数据，已经形成了一种观点，即多感觉区域对非特异性和联合丘脑核的异质传入信息存在差异化影响的一般原则，并且这些影响是通过下行通路中功能隔离子系统的分离来实现的。每个子系统通过闭合单独的丘脑 - 皮层回路可能传递单一模态的信号。
