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Difference test sensitivity: cognitive contrast effects

Author:
Lee, H.-S., O'Mahony, M.
Source:
Journal of sensory studies 2007 v.22 no.1 pp. 17-33
ISSN:
0887-8250
Subject:
models, sensory evaluation, sodium chloride
Abstract:
Judges performed 3-AFC tests between "threshold" concentrations of NaCl solutions and purified water stimuli. For some 3-AFCs, NaCl was the odd stimulus (S-odd); in others, water was the odd stimulus (W-odd). In one condition, interstimulus rinses were different from the stimuli; in a second condition they were the same. The 3-AFCs in which the interstimulus rinses were different from the stimuli yielded a higher d'. When interstimulus rinses were the same as the stimuli, S-odd 3-AFCs had a higher d' than W-odd 3-AFCs. The same was not true when the interstimulus rinses were different from the stimuli. Sequential Sensitivity Analysis and the conditional stimulus model did not furnish a complete explanation for these data. A consideration of additional cognitive contrast effects yielded a possible explanation.
Agid:
499471