Abstract
The aim of the present work was to identify how the pattern of brain rhythms alters with smooth changes in spatiality and verbality in cognitive tasks. Analysis of the EEG data obtained here led to two new conclusions: 1) during performance of mixed-type tasks, spatial-imaginal and verbal-logical thinking did not alter; rhythmic signs of both were present in the EEG without change and the established rhythmic pattern consisted of a superimposition of the spatial and verbal patterns; 2) introduction of a distance between the types of cognitive activity as an index of the difference between the corresponding EEG power spectra allows types of cognitive activity to be represented on a plane (using multidimensional scaling methods); cognitive states were positioned on the plane in a regular and logical manner corresponding to the psychological characteristic of the tasks performed. This result suggests the existence of a hypothetical “cognitive space,” whose structure can be identified by objective electrophysiological methods.
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