I am working on single trial motor imagery data i.e. EEG data. I am following a paper which has a dataset from BCI challenge IV (dataset 2b). After removing noise and extracting all the data from files into matrices, I am doing frequency band separation using wavelet decomposition(discrete wavelet transform) for frequencies 8Hz to 30Hz. after using dwt2 (2d wavelet transformation) I get four values LL, LH, HL, HH (L=LOW, H=HIGH). I want to confirm are these 4 combinations alpha band, beta band ,gamma band and delta bands? I cant find this anywhere.