“…Many algorithms [26,34] give priority to properties, not based on discriminatory power, but on how salient, relevant or preferred they are. This notion of preference is usually defined by appealing to psycholinguistic findings, for example, the finding that speakers tend to avoid prototypically gradable properties such as size, unless they are absolutely required, in contrast for example to colour which, as we have seen, is used very frequently [35,36]. However, many such findings are based on experimental domains in which colours are maximally salient and distinct.…”