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Revista Brasileira de Medicina do Esporte
Print version ISSN 1517-8692
BASTOS, Victor Hugo et al. Analysis of cortical power distribution as a function of the typewriting skill. Rev Bras Med Esporte [online]. 2004, vol.10, n.6, pp. 494-499. ISSN 1517-8692. http://dx.doi.org/10.1590/S1517-86922004000600006.
The present study aimed to investigate alterations in EEG patterns in normal and right-handed individuals, during the process of learning a specific motor skill (typewriting). Recent studies have shown that the cerebral cortex is susceptible to several changes during a learning process and that alterations in the brain's electrical patterns take place as a result of the acquisition of a motor skill and memory consolidation. In this context, the subjects' brain electrical activity was analyzed before and after the motor task. EEG data was collected by a Braintech 3000 and analyzed by Neurometrics. For the statistical analysis, the behavioral variables "time" and "number of errors" were assessed by a one-way ANOVA, block as main factor. For the neurophysiological variable "absolute power", a paired t-test was performed for each pair of electrodes CZ-C3/CZ-C4, in the theta and alpha frequency bands and for O1-P3/T3-F7 in the beta band. The main results demonstrated a change in performance, through both behavioral variables ("time" and "number of errors"). At the same time, no changes were observed for the neurophysiological variable ("absolute power") in the theta band. On the other hand, a significant increase was observed in the alpha band in central areas (CZ-C3/CZ-C4) and a reduction in the beta band in temporal-parietal areas (O1-P3/T3-F7). These results suggest an adaptation of the sensory-motor cortex, as a result of the typewriting training.
Keywords : Motor-sensory integration; Procedural memory; EEG.