Mood symptoms, cognitive function, and changes of brain hemodynamics in patients with COVID-19: A functional near-infrared spectroscopy study

Figure 2 Four types of connectivity. Nodes refer to channels of different regions of interest (ROIs) by different colors, and the black lines between two channel pairs represent a connection. To better explain the four connectivity types, no correlation threshold was set, so all connections (whether significant or not) between each channel pairs were drawn. A: Short-I connectivity for the intrahemispheric connectivity with each ROI; B: Short-II connectivity for the intrahemishperic connectivity between different ROIs; C: Long-I connectivity for the interhemispheric connectivity between symmetrical ROIs; D: Long-II connectivity for the interhemispheric connectivity between asymmetrical ROIs.