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  1. Abstract The influences of expertise and group size on an individual’s tendency to align with a majority opinion have been attributed to informational and normative conformity, respectively: Whereas the former refers to the treatment of others’ decisions as proxies for outcomes, the latter involves positive affect elicited by group membership. In this study, using a social gambling task, we pitted alignment with a high- vs. low-expertise majority against a hypothetical monetary reward, thus relating conformity to a broader literature on valuation and choice, and probed the countering influence of a high-expertise minority opinion. We found that the expertise of a countering minority group significantly modulated alignment with a low-expertise majority, but only if such alignment did not come at a cost. Conversely, participants’ knowledge of payoff probabilities predicted the degree of majority alignment only when a high-expertise majority endorsed a more costly option. Implications for the relative influences of expertise and stakes on conformity are discussed. 
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  2. A large literature has demonstrated an abnormal sense of agency (SOA) in schizophrenic individuals. One limitation of such studies is that they focus exclusively on cognitive or perceptual judgments, thus failing to address affective aspects of SOA. In our recent work, we have used instrumental divergence – the distance between outcome probability distributions associated with available actions – as a formal measure of agency, demonstrating an influence of this novel decision variable on behavioral choice preferences and associated neural computations in neurotypical adults. Here, we show that the preference for high instrumental divergence (i.e., for high-agency environments) is significantly modulated by individual differences in positive and negative schizotypy dimensions. Implications for future assessments of clinical populations are discussed. 
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