Graph Theory

Graph Theory Parameters :

1. Network Threshold: This value ranging from 0 to 1 will be used to construct the binary matrix of the connection between one channel and another.
2. Windows Length: The length in seconds of the each segments that will be used to calculate the relevant component of the graph theory analysis.
3. Print check box: If this option is selected, when the pipeline will be done calculating the component of the analysis it will output them on the screen.
4. Save check box: When done, the pipeline will save the Graph Theory data as a structure file in two form (like in fig. 24). The first form is a long storage form looking like this BandpassDay-month-year_time_graphTheoryData.mat and another one that is short term and that will be overwritten each time a Graph Theory analysis with a same bandpass will be done. It will look like this: BandpassgraphData.mat. The short format is more easily writable into script than the long format, but in either case you can change the name to something more meaningful. Also, a text file containing the input will be saved using the same name as the structure.
5. Check Graph: If this option is selected the pipeline will stop in the middle of the graph theory and will output a 3D rendering of what the node and the edges looks like with BrainNet Viewer3 (fig 26). A pop up will then appear which will ask you if you wish to continue with this analysis or if you wish to abort. If continue is selected the pipeline will continue calculating the graph theory component. If abort is selected the pipeline will exit the graph theory analysis and nothing will be

Bandpass Menu :

In the bandpass menu you can select at which frequency you want to filter your EEG data in order to do the Graph Theory analysis. If you select more than one frequency pass, the analysis will be repeated for each bandpass,

• Full: Full band goes from 1Hz to 50Hz.
• Delta: Delta band goes from 1Hz to 4Hz.
• Theta: Theta band goes from 4Hz to 8Hz.
• Alpha: Alpha band goes from 8Hz to 13Hz.
• Beta: Beta band goes from 13Hz to 30Hz.
• Gamma: Gamma band goes from 30Hz to 50Hz.

Graph Theory Examples :

Up in a few...