Fig. 4. Odor mixture identification task.
a Stimulus design. Two odorants (S-(+)-2-octanol and R-(−)-2-octanol) were presented at different concentrations and in different ratios as indicated by dot positions. In each session, four different mixture pairs (i.e. a mixture of specific ratio and concentration and its complementary ratio) were pseudo-randomly selected from the total set of 16 mixture pairs and presented in an interleaved fashion. b, c Mean accuracy (b) and mean of reaction times (c) plotted as a function of mixture contrast. Each point represents a single mixture ratio. Error bars are mean ± SEM over trials and rats. Solid lines depict the obtained fits for the predicted curves of a DDM for each set of mixtures at a particular concentration, family functions as described in ref. 2. Colors represent the total concentration of the mixture, with black indicating a 10−1 mixture and lightest gray 10−4 mixtures.