Electrode discrimination data from an adult cochlear implant user. The contour plots show discrimination performance in terms of d’ value. Electrode discrimination test data collected before (Test Session 1), during (Test Sessions 2 & 3), and after (Test Session 4) electrode discrimination training with the strong (8, 15r and 7, 13r – open red circles) and weak electrode contrast separations (11, 14r and 7, 9r – open blue circles).