Hi, everybody
1) On the issue of QEEG bands frequency absolute or relative power calculations, I wonder if we can us a simple method to assess baseline and post-treatment changes. By example dividing the GBA_fin (Gamma Band Activity after the task or treatment) to GBA_bas (Gamma Band Activity in baseline condition) and name this like Index of Plasticity as described here.Article Induced gamma band activity from EEG as a possible index of ...
2) The other complementary and mandatory question is: If I am using a High density approach with 256 Channel, how are you seeing the calculation by averaging the result of relative power of 17 electrodes from a region of interest or other divided by the averaged number of 256 channels get one number, then do the same with data after intervention and calculate the RATIO naming this the Index of local Plasticity? Would you accept it?
I like this idea, as long as the calculations are sound and you're clear about how you're defining your local regions.
Hi, Derrick! Thank you so much for the reply!
What do you mean by "as long as the calculations are sound"?
The regions we are calculating are four (two sensory motor and two temporo-parietal) and the 5th one the whole brain. Please see the table with results of power obtained in all these regions. Now, do you think that by dividing the average of one region, by Ex, gamma from LSM *left sensory-motor* to the average of whole brain and again for the RSM the same, can we compare those numbers as changes at local level or does not make any sense? The idea is to look to these specific numbers for left temporo-parietal region before and after we are applying TMS for patients with schizophrenia.
I think you better use Absolute power to do the index, because relative power it is already an index. You can try the index using mean frequency to.
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