CSD factors corresponding to N1 sink (peak latency 345 ms; lateral-temporal maximum accompanied by a mid-frontopolar source; 10.9% explained variance) and P2 source (600 ms; midcentroparietal maximum with mid-anterior and lateral-frontal sinks; 33.1%) distinctly reflected the parametric manipulation of odor intensity (Fig. 6B), whereas a later factor (990 ms; parietal maximum; 34.7%) did not. Furthermore, N1 sink and P2 source factors revealed several region-specific sink and source activations to H2S stimuli that differed significantly from blank air (Fig. 6C), whereas factor 990 failed to show similar odor-specific effects. The statistical analysis focused therefore on the previously identified and targeted factors representing N1 sink and P2 source.
