Dear SPMers,
I am going to do some source reconstruction of EEG but I need some of my questions to be answered first. I have an epoched EEG file with 27 trials which are all for just one condition. I would like to reconstruct the source for each trial first and I need to see all these reconstructed images separately. Then, I will average the reconstructed images and would like to see the final reconstructed image.
1. When I press the invert button, it starts to reconstruct the sources without asking me if I want to average or not. Does it first average the epochs and then reconstruct the sources or first reconstruct the sources for each trial and then averages the images?
2. In the next step (WINDOW), the question of power pops up. If I choose for example "induced", does it start the reconstruction from the beginning? If so, why this question is not asked in the "invert" step?
3. In "window" step, even when I choose "trials" for power, I can not see different reconstructions and I will just see "first trial". How can I see the reconstruction of other trials?
4. In "image" step, again, how is the final image computed? EEG epoch averaging or image averaging?
Best regards,
Pegah
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Pegah Tayaranian Hosseini
PhD Student
Room 4077, Tizard building (13)
Institute of Sound and Vibration Research
University of Southampton, SO17 1BJ, UK
Tel: 023 8059 2850
email: [log in to unmask]
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