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Abstract
The ABX discrimination task is a discrimination test in which the two test samples, A and B (one of which is the control sample, the other a modified sample), are presented to the participant first followed by sample X. The participant has to decide which sample X most closely represents (A or B). Results are tallied and dʹ values are calculated to determine if a significant difference exists between the samples. The ABX discrimination task may be thought of as a duo-trio test in reverse: in a duo-trio test, the reference sample is presented first, then the assessor has to decide which of two samples matches the reference; in the ABX test the assessor is given the two test samples first, then they are asked to match the final sample to A or B.
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