[Eeglablist] What is the relationship between EEG.icaweights and EEG.icawinv?

[Arnaud Delorme]

Based on historical reasons, the true weight matrix is not  
EEG.icaweights but EEG.icaweights*EEG.icasphere
The Infomax ICA algoritm first "sphere" the data (remove correlation)  
and then performs ICA.
So the inverse weight matrix EEG.icawinv is equal to

EEG.icawinv = pinv( EEG.icaweights*EEG.icasphere );

Best,

Arno