[The role of interhemispheric neurodynamics in the process of probability predicting]

The interhemispheric asymmetry of electrocortical components of the orienting reaction (the amplitude and latency of P300) were studied in the projection (occipital) and associative (central) areas in 8 subjects who were capable for adequate prediction under conditions of different information significance and 6 subjects with prediction problems. Under conditions of relevant stimulation, the amplitude asymmetry was more expressed and the latency of P300 in the central areas of both hemispheres was considerably shorter in good predictors than in bad ones. The rostrocaudal activation gradient was more expressed in good than in bad predictors, especially, under conditions of high information importance. It is suggested that the observed asymmetry in persons with prediction problems is related with nonspecific activation of subcortical structures and in good predictors it is caused by the local neocortical activation.