| Comments |
P.1 bottom paragraph: "But what is the perceptual space for odors? The exact analog of the early color mixing experiments has not been done, but from a quantitative analysis of perceptual similarities it has been argued that the space of odors is dominated by just one or two dimensions (Secundo et al., 2014), much fewer than the 400 dimensions at the level of sensory receptors [BNID 112608]. Similarly the number of discriminable odors is thought to be only 10,000, although this estimate is largely anecdotal (primary source). Clearly there is a paradox that remains to be resolved pitting the perceptual space of human smell against the receptor space." |