using ica to get occipital component producing alpha in eyes-closed resting eeg

Thomas Hartmann thomas.hartmann at UNI-KONSTANZ.DE
Wed Jan 27 13:57:30 CET 2010

i am looking for a method to identify the component(s) of an eyes-closed
resting-state eeg producing occipital alpha in a single subject. so far,
no method i tried (fastica, sobi) was able to produce such a component,
although topoplots show them very clearly. i also tried to filter the
data using a bandpass filter before letting the ica run.

i have 5 minutes of data available, partly contaminated with
tms-artifacts which i remove beforehand.

does someone know a good and stable approach? maybe i would have to
change the ica-algorithm? is there one specifically looking at

maybe i also use the wrong approach? is there a different option to get
something like a weighting matrix restricted to a specific
frequency-band (and also able to seperate occipital alpha from other
alpha generators like, e.g. temporal, motor etc..)?

thanks in advance!

Dipl. Psych. Thomas Hartmann

University of Konstanz
Department of Psychology
P.O. Box D25
78457 Konstanz

Tel.: +49 (0)7531 88 4612
Fax: +49 (0)7531-88 4601
Email: thomas.hartmann at

"I am a brain, Watson. The rest of me is a mere appendix. " (Arthur Conan Doyle)

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