[Effect of the informational specificity of a stimulus on human evoked potentials]

A study was made of the influence of stimuli with different informational specificity (a checkerboard pattern, the image of a house, the word "house") on respective EPs recorded in the occipital zone (OZ) and symmetrical postero-temporal areas (T5 and T6) of the cerebral cortex. Paired comparisons were carried out of distribution histograms of the maxima of negative and positive EP components. A statistical control of heterogeneity of such distributions by the Brand--Snedecker formula allowed to detect the histogram fragments, where the differences were most pronounced. All the fragments were included in the period from 0 to 250 ms. Estimation of discrimination indices testified to the influence of stimulus informational specificity on the respective EPs of the occipital and temporal areas of the left hemisphere.