Research Article

Acute Phase Neuronal Activity for the Prognosis of Stroke Recovery

Figure 1

(a) International 10–20 system electrode positions in relation to the cerebral cortex (black circles). In a representative subject with the lesion in the right hemisphere, coloured bars show bipolar derivations overlying the MCA territory, used in our experiment to assess EEG spectral powers (red for the hemisphere ipsilateral to the lesion (ILH) and blue for the hemisphere contralateral to the lesion (CLH)). Red (ILH) and blue (CLH) circles indicate the positions of the 16 gradiometers in each hemisphere used to assess MEG spectral powers. (b) Spectral power densities were separately calculated in the ILH and CLH as the mean of those of bipolar derivations overlying MCA territory (EEG signals) or as the mean of those of gradiometers (MEG signals). Spectral power densities are shown in two exemplificative patients (MEG and EEG signals). We evidenced DeltaTheta (dark grey) and AlphaBeta (light grey) bands. The homologous area symmetry (HArS) index is calculated as shown for band and total powers.
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