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Bringing self-determination theory to understand why intergroup behaviors are emitted, two studies were conducted to investigate how group norms and individuals' congruence with these norms predicted self-determination to pursue two types of intergroup behaviors (parity and discrimination). Experiment 1 (N = 97) manipulated ingroup norms in favor of parity versus of discrimination and assessed the behavior participants displayed (congruent or incongruent with the norm) and their motivations for emitting this behavior. The manipulated norms significantly influenced group members' behaviors. When the ingroup norm was parity, participants whose behavior was congruent with this norm reported more self-determination to emit this behavior. When the ingroup norm was prodiscrimination, participants whose behavior was congruent with this norm were less self-determined. Experiment 2 (N = 139) replicated and extended these findings in a more conflictual intergroup setting. Results are discussed in light of motivational and intergroup theories.

The present research applies a self‐determination theory framework to capture the broad spectrum of reasons why individuals engage in harmful normative behaviors. This correlational study (N = 242) focused on harmful behaviors that were either supported by one's in‐group or not. Participants whose in‐group encourages them to engage in a harmful behavior reported stronger motivation, both self‐determined and non‐self‐determined. Perceiving strong in‐group norms in favor of these behaviors was associated positively with the non‐self‐determined motivation pertaining to introjected regulation. The more participants agreed with an in‐group norm in favor of a harmful behavior, the stronger their self‐determination for engaging in this behavior. Results are discussed in light of self‐determination theory, normative models of social influence, and intergroup theories.

Bringing together self-determination theory, intergroup theories based on the social identity approach, and normative approaches, three studies conducted among hockey fans tested if social norms and social identity predict greater selfdetermined motivation to engage in derogatory behaviours against an outgroup team and higher frequency of these behaviours. Higher self-determination was conceptualised as an indicator of internalisation. In Study 1, hockey fans who identified more strongly as fans of the Montreal Canadiens (N = 181) displayed a stronger positive association between the perceived norm in favour of outgroup derogation and self-determined motivation to engage in derogatory behaviours against fans of an outgroup team. This interaction also emerged on the frequency with which the derogatory behaviours were enacted. In Studies 2 and 3 (Ns = 105 and 116), this norm by social identity interaction was replicated on both the self-determination and the frequency outcomes for fans of a diversity of teams in the National Hockey League. In Study 3, these findings were observed over and above a manipulation that framed derogatory behaviours as being either harmful or beneficial. Results are discussed in light of motivational theories, normative approaches, and intergroup theories based on the social identity approach.

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