Lateralization index is calculated as log(A / B), where A is average power at given frequency (default is 10 Hz, alpha) for the right hemisphere and B is average power at that frequency for the left hemisphere.
Lateralization index (default for alpha 10 Hz frequency):
= lat_idx(eeg) lidx
Output:
1.0831759729927761
Lateralization index for the range 8.0-12.5 Hz:
= lat_idx(eeg, frq=(8.0, 12.5)) lidx
Output:
1.0362690736517686