Balashova A N
Neirofiziologiia. 1984;16(4):512-9.
Phase shifts of cortical electrical activity and their role in excitation irradiation from the visual zone to the motor one were studied in rabbits before and during light stimulation. Different variations of the phase relations were observed both in the background activity and during stimulation. In most cases, however, a gradual increase in the theta-waves phase shift was observed parallel with an increase in the distance between the recording electrodes. The most motor reactions were carried out by the animal, if a phase shift gradient was expressed. Therefore the brain status characterized by spatial phase gradient of the theta-waves was supposed to be optimal for realization of the motor reaction. Light stimulation increased the quantity of synphasic oscillations between EEG processes in the points situated not far from each other and decreased the variability of the phase shift value between the sensorimotor and visual cortex, i.e. stabilized the phase gradient. This stabilization was expressed in the increase of wave coherence. Motor reactions of the rabbit in response to stimulation were realized when the most stable phase shift between the theta-waves in the sensorimotor and visual cortex was recorded.
在光刺激前和光刺激期间，对家兔皮层电活动的相位变化及其在从视觉区到运动区的兴奋扩散中的作用进行了研究。在背景活动和刺激过程中均观察到相位关系的不同变化。然而，在大多数情况下，观察到θ波相位变化随着记录电极之间距离的增加而逐渐增大。如果表现出相位变化梯度，动物会产生大多数运动反应。因此，以θ波空间相位梯度为特征的脑状态被认为是实现运动反应的最佳状态。光刺激增加了彼此距离不远的点之间脑电图过程的同步振荡数量，并降低了感觉运动皮层和视觉皮层之间相位变化值的变异性，即稳定了相位梯度。这种稳定表现为波相干性的增加。当记录到感觉运动皮层和视觉皮层中θ波之间最稳定的相位变化时，家兔对刺激的运动反应得以实现。
