Phase Lag Index

Phase Lag Index Parameters :

1. Length of Analysis Segment: The whole length of the EEG data will be cut into segments and the PLI will be calculated for each segment before getting averaged. The length in seconds need to be between 0 and the length of the EEG data.
2. Number of Permutations: The number of permutation correspond to the number of time the surrogate will be calculated. The number of permutations need to be greater than 0.
3. p Value for Surrogate Analysis: The p value will be used in the surrogate analysis to assess whether a given PLI is significant or no.
4. Print check box: If this option is check the pipeline will output a PLI plot at the end of the analysis (fig. 19).
5. Save check box: If select the PLI will be saved in the Phase Lag Index directory. Also, a text file containing the input will be saved using the same name as the figure.
6. Reorder EEG data with custom order check box: Enter the order in which you want each channel to appear (fig. 20). You can either reorder by channels name, channels number or by visually pointing and clicking on the channels. The order will be automatically saved and can be loaded back in another session.

Bandpass Menu :

In the bandpass menu you can select at which frequency you want to filter your EEG data in order to do the Phase Lag Index 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.

Phase Lag Index Examples :

Up in a few...