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SUCROSE DETECTION AND THE STABILITY OF THE 2‐AFC PROCEDURE IN THE PRESENCE OF A CONFOUNDING VARIABLE
Author(s) -
SHEPHERD DANIEL,
QUEK SIEW YOUNG,
PATHIRANA SREENI
Publication year - 2008
Publication title -
journal of sensory studies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 53
eISSN - 1745-459X
pISSN - 0887-8250
DOI - 10.1111/j.1745-459x.2008.00175.x
Subject(s) - confounding , robustness (evolution) , stability (learning theory) , statistics , sucrose , variable (mathematics) , econometrics , two alternative forced choice , mathematics , computer science , psychology , food science , chemistry , machine learning , mathematical analysis , biochemistry , gene
This study attempted to measure absolute thresholds for sucrose in aqueous solution for 51 experienced judges. Two experiments utilizing the two‐alternative forced‐choice (2‐AFC) procedure generated 6‐point psychometric functions plotting percentage correct as a function of sucrose concentration. In both experiments, the judges were divided into two groups and tested in either purpose‐built sensory booths or on open tables situated in a laboratory. In the first experiment, the influence of a confounding variable was apparent, with nonmonotonic psychometric functions being obtained. In experiment II, the confounding variable was eliminated, permitting the estimation of absolute thresholds. In both experiments, there was no main effect of gender or session, though there was an effect of testing locality ( P < 0.05). Data are reported to emphasize the importance of controlling extraneous variables and to demonstrate the robustness of the 2‐AFC procedure.PRACTICAL APPLICATIONS This research contributes to an otherwise impoverished database on the detection of sucrose in a solution. The uses of the research include estimates of sucrose detection thresholds for comparative purposes; confirmation of the stability of the two‐alternative forced‐choice procedure; the utility of using formal testing areas as opposed to ad hoc testing stations; and the dangers of utilizing substandard experimental equipment while conducting research of this nature.