I have a 3 min recording of source converted EEG data. I used minimum norm imaging sLORETA. I extracted my source data using -> extract--> scouts time series for 4 regions of interest using the desikan-Killiany scout and created my matrix file of 4 scouts with source data points per millisecond. I then moved my source matrix into 'files to process' clicked on ;process user matrix' and ran a PSD welch to obtain power values. Here is a picture
My PSD power data popped up underneath my source matrix file and i exported my PSD values to matlab. Here a pic of the values i obtained. My sources are on the x axis and my mean Hz values are on the y. I've never seen numbers so small in my life. This is also my first time working with sloreta source data, so i don't know what to expect. Is this normal? Did i do something wrong?
Anyway, if i didnt, are these absolute power values? Do these values require further computation to get them into "normal" looking units if they are not already in abs units? For my next step i just want to average across frequency bands and obtain my mean values for Delta, theta etc.... I know how to do that, but i dont know what these numbers mean and why they are so small.
Thanks very much !