Figure 2.

Cotton tip-based olfactory threshold test. Mice were presented with two cotton swabs simultaneously: one laced with vehicle (mineral oil) and the other with increasing concentration of 1-octanol. The cumulative duration of sniffing on each cotton swab was quantified. There was a 24-h interval between two adjacent concentrations. For each concentration, the percentage of time spent sniffing the 1-octanol cotton swab in the total duration of sniffing on both cotton swabs was calculated. An above 50% sniffing duration of the octanol cotton tip indicateds detection of the odorant. Figure is adopted from our previous publication (Pan et al., 2012).