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ABX discrimination

PHONETICS: Of the three stimuli presented on an ABX trial, the third is the focus. The first two stimuli (A and B) are standard, S1 and S2 in a randomly chosen order, and the subjects’ task is to choose which of the two is matched by the final stimulus (X).
LIT. Macmillan, N.A., & Creelman, C.D. (1991)