Fig. 4.

Wearing the face masks affected the clustering coefficient of the brain networks within the delta band (K = 0.15) for the control and patient groups. The controls wearing the face masks increased the clustering coefficient relative to the case without the face masks under the resting state. Moreover, the controls wearing the face masks impaired the clustering coefficient relative to the case without the face masks under the HV condition. The patients wearing the face masks increased the clustering coefficient relative to the case without the face masks under the HV condition. * denotes P < 0.05. HV, hyperventilation.