[Eeglablist] Comparing mu suppression with EEGLAB

[CHOUTEAU Florient]

Hi,
I am an human factor students doing a research projet on mirror neurons 
and I am struggling with EEGLAB.
I am trying to compare several EEG signals, mainly located in C3/C4 
using more or less the same protocol as Oberman et al 2007[1] and 
2005[3]. In fact, I acquired three signals (subject presented to three 
videos including a baseline (white noise)) and I am trying to calculate 
mu suppression by displaying "The ratio of the power in the mu 
frequency" as described in [1], [2] and [3]. (Specific quote: "For each 
cleaned segment the integrated power in the 8--13 Hz range was computed 
using a fast Fourier transform")
Problem is, I have absolutely no clue as to how "substract" the power 
from the two tests and the baseline in EEGLAB. I successfully displayed 
the power = f (frequency) for all of my signals but substracting one to 
the other and calculating the global power in the frequency range remain 
a mystery to me.

Assuming that I dispose of cleaned epoched data, would you have any idea 
as to how to proceed, using EEGLAB functions or simply MATLAB ones,

Best Regards,

Florient CHOUTEAU

References:

[1]Oberman, L. M., McCleery, J. P., Ramachandran, V. S., & Pineda, J. A. 
(2007). EEG evidence for mirror neuron activity during the observation 
of human and robot actions: Toward an analysis of the human qualities of 
interactive robots. /Neurocomputing/, /70/(13), 2194-2203.
http://cognitiveneurolab.ucsd.edu/Papers_files/Oberman,%20L.M.,%20McCleery,%20J.P.,%20Ramachandran,%20V.S.,%20and%20Pineda,%20J.A.%C2%A0%20EEG%20evidence%20for%20mirror%20neuron%20activity%20during%20the%20observation%20of%20human%20and%20robot%20actions_2.pdf

[2]Arnstein, D., Cui, F., Keysers, C., Maurits, N. M., & Gazzola, V. 
(2011). ?-suppression during action observation and execution correlates 
with BOLD in dorsal premotor, inferior parietal, and SI cortices. /The 
Journal of Neuroscience/, /31/(40), 14243-14249.
http://www.jneurosci.org/content/31/40/14243.full

[3]Oberman, L. M., Hubbard, E. M., McCleery, J. P., Altschuler, E. L., 
Ramachandran, V. S., & Pineda, J. A. (2005). EEG evidence for mirror 
neuron dysfunction in autism spectrum disorders. /Cognitive Brain 
Research/, /24/(2), 190-198.
http://www.bowdiges.org/documents/files/Mirror_neurons_in_ASD.pdf


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