Three studies investigated the determination of social discrimination by the valence of stimuli that are allocated between groups. The studies were based on either the minimal group paradigm or a more reality-based laboratory intergroup setting, with stimulus valence, group status, and group size as factors and with pull scores on Taifel matrices as dependent variables. In general, the results showed that group members did not discriminate against the out-group when allocating negative stimuli, where as for positive stimuli the typical in-group bias was found. However, those participants whose positive social identity was threatened by assigning them to inferior or minority groups showed an increased willingness to favor the in-group over the out-group in the allocation of both positive and negative stimuli.
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