factor, randomization distributions (10,000 repetitions) were estimated from the observed data of the entire sample (N = 41) to compute univariate (channel-specific) T2 statistics for paired samples (see Kayser et al., 2007, for computational details), which allowed determination of regional sink and source activity in response to H2S stimulation as compared to blank air. Significant differences were used to identify individual sites or subsets of sites to be included in the conventional repeated measures ANOVA, which consisted of either midline sites or lateral, homologous recording sites over both hemispheres, and thereby adding either site, or site and hemisphere as within-subjects factors to the design. However, because recording sites were selected on the premise that they collectively represent sink or source activity associated with odor detection, site effects were not further pursued in these analyses.
