does a numerical bias alternative carry much weight, because the ordinal properties of the numerical estimates themselves suffice to produce the main result. The results on mental analysis, therefore, reinforce with increased clarity the conclusions drawn on the basis of mental synthesis: Cognition plays an immensely important role in chemosensation, just as it does in vision and hearing. In particular, people possess large, ecologically valuable reservoirs of olfactory knowledge. On an even more general level, these results may be interpreted as displaying lawful and longenduring constraints on internal representation ( Shepard, 1984; Wolf & Algom, 1987).
A final word on methodology. Fortunately, in due deference to the unifying theme of this conference, these experiments demonstrate (if one still needed one) the considerable potential of ratio scaling to probe cognitive as well as sensory processes.
The research reported here was supported in part by a grant from Unilever Research, Port Sunlight Laboratories, and by NIH grant DC 00284.
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