Figure 2 show group comparisons (NAC vs. LTAA) of the grand average relative θ power time courses at electrode site FCz for the target (1st row), rare non-target (2nd row) and standard non-target (3rd row) stimuli. The LTAAs show, on average, a larger increase in θ power in response to the target stimulus (i.e. larger θ ERS or induced oscillation) compared to the NACs. The grand average peak ERS for the LTAAs is 217%, while the grand average ERS maximum is 138% in the NACs. Grand average topographical (ERS) maps are also shown for the time point corresponding to the ERS peak for each of the NAC and LTAA groups. These spatial maps show that the ERS has a spatial peak over the centro-parietal region for the NACs, while for the LTAAs, the ERS is localized more over the fronto-central region. On average, the θ ERS for the NACs and LTAAs for the non-target stimuli do not show large difference between the NACs and LTAAs. Comparison across the three stimulus types shows that the induced oscillations are largest for the target stimulus compared to the non-target stimuli.
