During a visual-motor task the movement strategies and the learning processes are
investigated. A group of 10 normal young volunteers underwent the experiment. The
EEG signal was recorded through the 10-20 acquisition system during the execution
of a task after a visual input. Each subject repeated the movement several times in
three different conditions: i) without knowledge of the performance; ii) with visual
feedback; iii) with knowledge of the result. The signal was transformed through Laplacian
operator in order to eliminate the spurious coherence and then time-variant coherence
was calculated. Different trends of the coherence function have been evidenced in
subjects learning and not learning the better movement strategy. In particular, relations
have been found between frontal, central and occipital electrodes in medium and high
frequency ranges.
Keywords:
Event-Related Potentials - Laplacian Transformation - Bivariate Time-Variant Spectral
Analysis
