Investigations on EEG Coherence during repeated learning and recall of a foreign language

The different areas of the brain are oscillating in phase with the same frequency range at any given point of time. These areas of the brain cooperate with one another for performing a cognitive task. This neural interaction process might be examined by measuring the synchronization of the brain signal. In this work a method for analysing the EEG signal during repeated learning and recall of a foreign language using conventional coherence and wavelet coherence methods has been done. Cross Wavelet Transform and Wavelet Coherence of EEG signal shows the correlation between specific regions of frontal and temporal lobes of the brain. From the results obtained, it has been observed that coherence decreases when the familiarity in learning increases. It is also observed that the left hemisphere of the brain is more activated than the right hemisphere during repeated learning and recall of a foreign language.