[Eeglablist] Analysis of ERSP data

Christopher Retzler lpxcr1 at nottingham.ac.uk
Thu Oct 7 06:48:17 PDT 2010


I am currently analysing ERSP data from a concurrent choice task and wondered if the following approach is OK?

 I pre-calculate the Frequency measures and then use the following code to create variables containing the ERSP data:

STUDY  = pop_erspparams(STUDY, 'freqrange', [0 35]);

[STUDY erspdata ersptimes erspfreqs] = std_erspplot(STUDY, ALLEEG, 'channels', {'E5', 'E6','E11', 'E12'}, 'plotsubjects', 'on');  % Frontal cluster of electrodes

 

I then extract the data for each subject in each condition for the frequency of interest (in this case beta) and the relevant time period:

Fz_choc = erspdata{1,2}(25:54,107:136, 1, 1);

Fz_cigs = erspdata{1,2}(25:54,107:136, 1, 1);

 

I then calculate the mean beta power for each subject and condition. This data can then be exported to SPSS for ANOVA analysis along with other behavioural variables etc. Is it OK to average the data in this way?

 

Thanks in advance.

 

Chris

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