Reactivity of θ and α EEG Frequency Bands in Voluntary Attention in Junior Schoolchildren

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Spatiotemporal organization of rhythmic θ and α EEG components was studied by means of spectral-correlation analysis in seven- to eight-year-old children (n = 18) during anticipatory selective attention to sensory tactile and auditory stimuli. The topography of changes in coherence of the α oscillations suggests that functional assemblies formed on the basis of the α rhythm are modality-specific. Their centers are localized in respective sensory-specific cortical regions (central areas of both hemispheres during tactile attention and temporal areas during auditory attention). The functional integration on the basis of the θ rhythm is represented in both hemispheres by functional associations of the temporal, frontal, and (to a lesser extent) posterior associative areas independently of the modality of a relevant signal. Both types of the functional integration are significant for a correct solution of a perceptive task. The proposition that the cooperation of the α- and θ systems in neuronal organization of voluntary attention ensure, respectively, its informational and motivational aspects.

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