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Acquisition (A) and Extinction (B) of conditioned fear as a function of social group. The difference between in-group and out-group categories emerged during extinction training and was manifested as a resistance to extinction to Black out-group CSs specifically. For simplicity, the Y-axis represents mean startle CS+/CS– differentiation scores after controlling for baseline (ITI) startle. Error bars represent mean standard error (SEM). **p < 0.01.
