As the ERO power measures quantify the ERP waveform dynamics within a time window, it is possible that they contain additional group discriminatory information to the ERP amplitude measure, when this measure is only quantified at a single time point in the ERP waveform2. As the total ERO power measures contain contributions from both phase-locked and non-phase-locked oscillations, the contributions of non-phase-locked induced oscillations might provide independent information to that of the ERP amplitude measure. This could account for the finding reported in the Jones et al. (2006) and Rangaswamy et al. (2007) studies that the ERO measures provided group discriminators that were more powerful than the ERP amplitude measures.
