Quantitative EEG mapping in powers of electrical activity, concentration of main powers and area of concentration in relation to the side of presentation (left, right, and bihemisphery) and closer location was done on a 24-day-old infant first, and again when the infant was 2.5 months. EEG responses are analyzed in following acoustic modalities: (1) specific (native language speech of mother and unfamiliar female, unfamiliar female speech of foreign language); (2) unspecific (passive period). Familiar and unfamiliar texts present the contents of speech material. Comparative findings on two different ages showed that the infant maintains the processing scheme of unfamiliar stimulus (passive period, foreign language), and also very similar processing scheme of unfamiliar voice regardless if the text in native language is familiar or unfamiliar. During stimulation with familiar or unfamiliar text in native language, which is read by mother, processing type is significantly changed in relation to the age at the time of examination. While a 24-day-old infant shows a similar scheme in processing the familiar and the unfamiliar voices in native language, at the age of 2.5 months, this scheme of processing is changed, especially for theta rhythm, which now has bihemisphery presentation (at earlier stage it has right-side presentation) in the F-C-P region, what is practically the same region where also delta rhythm is processed. However, the sample of unfamiliar voice in native language observed in subsequent period, when the infant was 2.5 months old, maintains the same processing location as it has at an earlier ontogenetic stage, when the infant was 24 days old, regarding the theta rhythm processed in the F-C-P region with right-side presentation, and delta rhythm processed in C-P region with bihemisphery presentation. Post stimuli periods observed when the infant was 2.5 months old show obviously differentiation of theta and delta rhythms' samples and their electrophysiological parameters. The samples of familiar and unfamiliar texts in native language when read by mother (familiar voice) begin to differentiate regarding to closer location and number of centers for maximal powers in theta rhythm at subsequent ontogenetic period (2.5-month-old infant). The samples of quantitative EEG mapping for a 2.5-months-old infant show the signs of complex processing of different stimuli types: known/unknown voice, foreign language, with stronger inclusion of parietal regions, bihemisphery and an increase in number of maximal powers' centers, compared to the samples when the infant was 42 days old. Quantitative EEG electrophysiological parameters are discussed in relation to side representation and closer regional location with the aim of explaining the processing of complex speech and language stimulation in relation to certain characteristics in its bases.
Aim of the research was to examine similarities and differences between the periods of experiencing visually stimulated directed speech-language information and periods of undirected attention. The examined group comprised N = 64 children, aged 4-5, with different speech-language disorders (developmental dysphasia, hyperactive syndrome with attention disorder, children with borderline intellectual abilities, autistic complex). Theta EEG was registered in children in the period of watching and describing the picture ("task"), and in the period of undirected attention ("passive period"). The children were recorded in standard EEG conditions, at 19 points of EEG registration and in longitudinal bipolar montage. Results in the observed age-operative theta rhythm indicated significant similarities and differences in the prevalence of spatial engagement of certain regions between the two hemispheres at the input and output of processing, which opens the possibility for more detailed analysis of conscious control of speech-language processing and its disorders.
Standard EEG and Neurofeedback (NFB) treatment indicated higher theta load, alpha 2 and beta 1 activity measured in the cartographic EEG which was done after the relative failure of NFB treatment. After this, the NFB treatment was applied which lasted for six months, in a way that when the boy was reading, the visual input was enhanced to the left hemisphere and auditory input was reduced to the right hemisphere. Repeated EEG mapping analysis showed that there was a significant improvement, both in EEG findings as well as in attention, behavioural and learning disorders. The paper discusses some aspects of learning, attention and behaviour in relation to changes in the standard EEG, especially in cartographic EEG and NFB findings.
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