From the perspective of perception, that is, how an individual consciously experiences and describes a smell in terms of intensity and its olfactory family for a given concentration of an odorant, a lot of variation is expected among individuals, i.e., different people experience the same smell differently. This variability (uncertainty) poses a significant challenge when using psychophysics to correlate concentrations with scent intensity and associating individual component intensities and olfactory families with the overall perception of a fragrant mixture. In this way, in olfactory perception studies, factors like inherent variability and response bias are inevitable and should be considered .