The CSD topography revealed a centroparietal and right hemisphere predominant source only for the control group. In alcoholics, by contrast, the posterior source was largely at the midline region and the sink shifted to the left for the primed condition, while the controls showed a strong source that was predominant in the right hemisphere, suggesting possible hemispheric asymmetry during linguistic processing in alcoholics. Using the measures of resting EEG, Bauer and Hesselbrock (2002) reported that individuals with family history of alcoholism showed increased activations of fast beta at both anterior and posterior locations while having decreased theta (anterior and posterior) as well as alpha (anterior) activations. However, as the measure used in the study was not a formal CSD, the results cannot be interpreted based on the radial current flow since the surface Laplacian has been computed from the EEG relative power data rather than from the actual amplitude data of the (frequency filtered) EEG waveforms.
