This study first tests the factors influencing the willingness to express opinions online. Guided by the spiral of silence theory, the research used a survey to test whether fear of isolation and opinion congruency work online. Second, the study explores how psychological constructs, including self-efficacy, collective efficacy, and proxy efficacy affect the willingness to express disagreement. A 2 × 2, verbal persuasion × vicarious experience, experiment was applied. Third, this study also conducted a content analysis to measure disagreement expressions in online newspapers and test how these expressions affect opinion quality and online discussion involvement. The survey study (N=321) showed that while fear of isolation online negatively predicts the willingness to express individual opinions, opinion climate congruency is not associated with the willingness. The online experiment demonstrated that mastery experience and verbal persuasion positively influence self-efficacy, but vicarious experience's effect was not confirmed. Self-efficacy plays the most salient role in predicting whether one selects to express disagreement online. The content analysis (N=1,288) of the discussion threads demonstrated that disagreement expression is widespread in the online newspaper forums analyzed, and such expression positively influences reasoned opinions and political discussion engagement.

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La perception d’insuffisance lactée (PIL) est la première raison à travers le monde pour laquelle les mères cessent d’allaiter. La PIL est associée au niveau du sentiment maternel d’efficacité en allaitement (SMEA), lequel est entre autres influencé par la persuasion verbale. Basé sur le cadre théorique du SMEA de Dennis (1999), le but de cette étude de cas multiples était d’explorer l’influence de la persuasion verbale des personnes significatives sur le SMEA, lequel influence la PIL et la poursuite de l’allaitement. Des entrevues semi-dirigées ont été réalisées trois mois après le début de l’expérience d’allaitement de cinq mères primipares, ayant poursuivi l’allaitement malgré une PIL. À la suite d’une analyse de contenu, les résultats ont montré que le deuxième mois constituait un moment clé dans le rehaussement du SMEA, favorisé par une meilleure compréhension des comportements infantiles. L’expérience acquise semble avoir limité l’influence des commentaires dissuasifs reçus des grands-mères. En offrant leur réassurance, notamment au sujet de la production lactée, la persuasion verbale de femmes détenant une expérience positive d’allaitement avait une influence positive. En contrepartie, la persuasion verbale des professionnels de la santé, tels que les conseillères en lactation et les infirmières, avait une influence négative lorsque ceux-ci manifestaient leurs préoccupations à l’égard du poids de l’enfant et suggéraient l’utilisation du tire-lait. À la lumière de ces résultats, les professionnels de la santé doivent améliorer leurs habiletés à transmettre les informations entourant la prise de poids et à encourager l’allaitement directement au sein. / Across the world, the main reason for breastfeeding cessation is perceived insufficient milk (PIM). The level of maternal breastfeeding self-efficacy (BSE), which is influenced, among other factors, by verbal persuasion, affects PIM. This study aims to explore the influence verbal persuasion from significant people holds over BSE, which in turn has an impact on PIM and maintaining breastfeeding. A multiple case study was carried out in order to deepen the understanding around PIM. Semi-structured interviews were conducted with five primiparous mothers three months after they began breastfeeding, and who maintained breastfeeding despite experiencing PIM. Following a content analysis, the results showed that second month was a key moment in the enhancement of BSE, favored by a better understanding of childhood behaviors. Experience seems to have limited the influence of dissuasive comments from the grandmother. By the reassurance offered, especially about milk production, verbal persuasion received from women with positive breastfeeding experiences had a positive influence. In return, verbal persuasion from health professionals, like IBCLC and nurses, had negative influence when they were expressing worries regarding the infant’s weight and was suggesting to use breast pumps. The results suggest that health professionals need to improve their ability to convey information regarding infant weight and should encourage breastfeeding directly to the breast.