 Scientists have also been interested in the study of folk emotion concepts, and they have applied to them experimental techniques common in the psychology of concepts. These techniques have revealed that emotion concepts, like most ordinary concepts, are prototypically organized (Fehr &amp; Russell 1984). There are better and worse examples of emotions as ordinarily understood (e.g., fear is a better example of emotion than awe) and there are borderline cases, such as boredom: on those, ordinary language users are split as to whether they qualify as emotions. A variety of psychological structures have been proposed by concept theorists to account for membership in folk emotion categories, including similarity to prototypes, exemplars, perceptual symbols and others (Fehr &amp; Russell 1984; Wilson-Mendenhall et al. 2011).