[Eeglablist] FW: About an export of mean band power etc

[guy richardson]

Hi people

 

I have a limited time to export the mean band power and phase coherence for different frequency bands in my eeg data. 

 

I have been testing the affcect of audio entrainment tones (binaural beats etc) in the brain.

 

I have to export these measures in EEG lab. Below is what i am looking to achieve but i get an error with my script.

 

This is a paragraph from a dissertation i found that used the same methods i am trying to achieve... Could someone help me achieve the same data with my EEG... P.S i am using the same electrode placements and setup as this study. What do i have to do in EEGlab to achieve this? i have tried exporting the data with the spectopo function as stated below but i get an error with the Axes.

 

Any help would be great

 

Regards - Guy Richardson, Hull university

 

 

4) Mean Spectral Power:

On finding 5 largest contributing components for specific frequency, the spectral power for
those components is found using spectopo function as below:


[spectra, freqs, speccomp, contrib, specstd]=spectopo(EEG.icaact, EEG.pnts, EEG.srate, 'freq',
[8 12], 'chanlocs', EEG.chanlocs, 'nfft', 128, 'winsize', 128, 'overlap', 64);

(Note: “EEG” is a Matlab structure which carries all the EEG data. EEG.icaact : All EEG
components computed by ICA, and so on.)


Above function computes spectral power for all components, so the largest 5 components are
selected and their power in db/Hz are averaged over the frequency band. Average of individual
components is again averaged as a mean power for specific frequency band.

For each subject this mean spectral power is calculated for all known frequency bands for EEG,
viz. delta, theta, alpha, beta and gamma.

26




Page 37
5) Mean Band Power values for all 15 subjects under all stimulus and prestimulus
conditions. Values are in Db/Hz.


Table 7: Mean Band Power Values in Db/Hz for all subjects

7Hz 14 Hz 21Hz
preBB BB postBB preBB BB postBB preBB BB postBB


Subject Subject Subject
ID_Freq ID_Freq ID_Freq
1_7 3_14 2_21

delta 13.39643 10.27327 9.40414 delta 18.53746 16.09698 12.60519 delta 7.447825 7.879632 7.566135

theta 3.213804 1.503029 -1.04299 theta 8.404882 6.666348 4.722896 theta -0.27831 1.855506 1.118552

alpha 3.464209 2.207141 -2.52265 alpha 9.047795 6.028326 2.814989 alpha 3.730197 4.849102 3.986289

beta -0.13718 -4.60142 -5.30151 beta -0.91792 -2.18732 -3.28766 beta -5.76725 -3.94263 -4.44627

gamma -5.1673 -10.184 -6.01457 gamma -3.2478 -4.35031 -5.71946 gamma -10.7856 -10.1077 -10.6465
 		 	   		   		 	   		  
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