Taroian N A, Genkina O A, Miamlin V V
Zh Vyssh Nerv Deiat Im I P Pavlova. 1992 Jan-Feb;42(1):28-36.
The ability of mental construction of easily verbalized geometric figures was studied in 20 healthy subjects by means of recording of the evoked potentials of the cerebral cortex. Fragments of geometric figures were presented with the intervals of 80 and 500 ms. To one half of the subjects the stimuli were presented unilaterally (both fragments to one and the same visual field, to the left or to the right one) and to the second half of the subjects--bilaterally (the first fragment--to one visual field and the second one--to the other). It was established that the latency of the wave P300 was shorter and the amplitude--greater at correct decisions of the visual-spatial task than at false ones, both at unilateral and bilateral fragments presentation. At a great interval (500 ms), when the effects of masking became significantly weaker, a predominant activation of the left hemisphere was observed: the latency of the late components was shorter and the amplitude--greater, when the information came "directly" to the left hemisphere. The obtained results testify once more to a great variability, dynamic interhemispheric relations, impossibility of connecting the realization of some functions with one of the hemispheres.
通过记录大脑皮层的诱发电位，对20名健康受试者构建易于用言语表达的几何图形的能力进行了研究。以80毫秒和500毫秒的间隔呈现几何图形片段。对一半受试者单侧呈现刺激（两个片段都呈现给同一个视野，要么是左侧视野，要么是右侧视野），对另一半受试者双侧呈现刺激（第一个片段呈现给一个视野，第二个片段呈现给另一个视野）。结果表明，无论是单侧还是双侧呈现片段，在视觉空间任务做出正确决策时，P300波的潜伏期比错误决策时短，波幅比错误决策时大。在较长间隔（500毫秒）时，当掩蔽效应明显减弱时，观察到左半球的优势激活：当信息“直接”传入左半球时，晚期成分的潜伏期较短，波幅较大。所获结果再次证明了大脑半球间关系具有很大的变异性和动态性，以及不可能将某些功能的实现与某一个半球联系起来。
