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Identification accuracy across four test sessions for the two subgroups of the Difficult-Trained (D-T) sound sources: Difficult-Trained-used (D-T-used), that is, two tokens of each source selected for training and used during training and Difficult-Trained-alternative (D-T-alt), that is, two tokens of each source selected for training but not used during training. Error bars represent one ± one standard deviation of the mean.
