Changes in EEG Power Spectral Density and Cortical Connectivity in Healthy and Tetraplegic Patients during a Motor Imagery Task

Figure 4

Connectivity weights (mean value+SD) estimated on 5 healthy subjects and on 5 tetraplegic patients with the genetic algorithm described in the text. A qualitative exemplum of the resulting connectivity, based on the average values on the entire population, is depicted in the bottom panel, where line thickness is proportional to the connectivity weight. It is worth noting in the upper panel the presence of very significant statistical differences (𝑝<.01, columns with ∗∗) between healthy subjects and tetraplegic patients for what concerns the connections from the LF region to the primary motor and supplementary motor areas. Significant statistical differences (𝑝<.05, columns with ∗) are also evident in the connections which link the HF region to the primary motor and supplementary motor areas.