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Bias index during the four training sessions for each individual participant. Each row shows the five participants within a condition. Note that for the neutral-towards-happy conditions (top three rows) training should induce an increase in bias index, whereas for the sad-towards-neutral conditions (bottom three rows) training is intended to reduce bias index. N-H = neutral-towards-happy, S-N = sad-towards-neutral, s1 = session 1, and so forth, p1 = participant 1, and so forth.
