Stewart, N., & Matthews, W. J. (2009). Relative
judgment and knowledge of the category structure. Psychonomic Bulletin
& Review, 16, 594-599.
For evenly spaced stimuli, a purely relative judgment account of
unidimensional categorization performance is trivial---all that is required
is knowledge of the size of stimulus difference corresponding to the width
of a category. For unevenly spaced stimuli, long-term knowledge of the
category structure is required. We argue that such knowledge does not
necessitate a direct, absolute mapping between (representations of) stimulus
magnitudes and category labels. We show that Stewart, Brown, and Chater's
(2005) relative judgment model can account for data from absolute
identification experiments with uneven stimulus spacing.