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Collective Behaviours: Mediation Mechanisms Underlying the Influence of Descriptive and Injunctive Norms.

ABSTRACT: Conformity to descriptive and injunctive norms has been explained by informational and normative social influence. We argue that in addition to these two types of social influence, outcome expectancy can mediate descriptive norms' impact on people's intentions in the case of collective behaviours such as hand washing to prevent virus spread. Two studies manipulate norm type (descriptive vs injunctive) and norm level (low vs high) and show their effects on intention to perform the behaviour. In Study 1 (N = 216), outcome expectancy was positively influenced by descriptive norm and was associated with intention. In Study 2 (N = 731), outcome expectancy was influenced by descriptive but also by injunctive norm. Similar to Study 1, outcome expectancy was significantly associated with intention. Our data support the idea outcome expectancy is an important antecedent of intention and an additional mechanism underlying the effects of descriptive norms and, in some instances, injunctive norms.

SUBMITTER: Moussaoui LS

PROVIDER: S-EPMC12372769 | biostudies-literature | 2023

REPOSITORIES: biostudies-literature

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Collective Behaviours: Mediation Mechanisms Underlying the Influence of Descriptive and Injunctive Norms.

Moussaoui Lisa Selma LS White Katherine M KM Desrichard Olivier O

International review of social psychology 20231113

Conformity to descriptive and injunctive norms has been explained by informational and normative social influence. We argue that in addition to these two types of social influence, outcome expectancy can mediate descriptive norms' impact on people's intentions in the case of collective behaviours such as hand washing to prevent virus spread. Two studies manipulate norm type (descriptive vs injunctive) and norm level (low vs high) and show their effects on intention to perform the behaviour. In S ...[more]

PMID: 40951806

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Project description:Membrane Vesicles (MVs) are envelope derived extracellular sacs that perform a broad diversity of physiological functions in bacteria. While considerably studied in pathogenic microorganisms, the roles, relevance and biotechnological potential of MVs from environmental bacteria are less well established. Acidithiobacillaceae family bacteria are active players in the sulfur and iron biogeochemical cycles in extreme acidic environments and drivers of the leaching of mineral ores contributing to acid rock/mine drainage (ARD/AMD) and industrial bioleaching. One key aspect to such rol is the ability of these bacteria to tightly interact with the mineral surfaces and extract electrons and nutrients to support their chemolithotrophic metabolism. Despite recent advances in the characterization of acidithiobacilli biofilms and extracellular matrix (ECM) components, our understanding of its architectural and mechanistic aspects remains scant. In this work, we show that vesiculation is a common phenomenon in distant members of the Acidithiobacillaceae family, and further explore the role of MVs in multicellular colonization behaviours using `Fervidacidithiobacillus caldus´ as bacterial model. Production of MVs in `F. caldus´ occurred in both planktonic cultures and biofilms formed on sulfur surfaces, where MVs appeared individually or in chains resembling Tube-Shaped Membranous Structures (TSMSs) important for microbial communication. Liquid chromatography-mass spectrometry data and bioinformatic analysis of the MVs-associated proteome revealed that F. caldus MVs were enriched in proteins involved in cell-cell and cell-surface processes, and largely typified the MVs as outer MVs (OMVs). Finally, microbiological assays showed that amendment of `F. caldus´ MVs to cells and/or biofilms affects collective colonizing behaviours relevant to the ecophysiology and applications of these acidophiles providing grounds for their exploitation in mining biotechnologies.

Dataset Information

Collective Behaviours: Mediation Mechanisms Underlying the Influence of Descriptive and Injunctive Norms.

Publications

Collective Behaviours: Mediation Mechanisms Underlying the Influence of Descriptive and Injunctive Norms.

Similar Datasets

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