Km. Sailor et Ej. Shoben, EFFECTS OF CATEGORY MEMBERSHIP ON COMPARATIVE JUDGMENT, Journal of experimental psychology. Learning, memory, and cognition, 19(6), 1993, pp. 1321-1327
The results of 4 experiments suggest that the role of categorization i
n comparative judgment is much greater than previously believed. Ss ju
dged which of 2 objects, selected from 2 taxonomic categories, was lar
ger. Items from one category were always larger than items from the ot
her category. When the items in the pair were from different categorie
s, the semantic distance effect was attenuated if the relation between
the categories was also generally true in the real world. When the ex
perimental relation between the 2 categories differed from that of the
real world, no diminution of the magnitude of the distance effect was
observed. Further experiments rule out an artifactual explanation and
also establish that diminution of the distance effect will occur even
if the correlation between category membership and magnitude is relat
ively modest.