Visschers, Vivianne

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Vivianne
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Visschers, Vivianne

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2009 - 200912010 - 201916
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Gerade angezeigt 1 - 10 von 17
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    How to eat healthy and save the planet. Development and evaluation of an evidence-based app
    (2019) Feck, Vanessa; Herrmann, Anne; Visschers, Vivianne
    Background: Food consumption affects individuals as well as our planet. How can a tailored app help people to make healthier and more sustainable meal choices? To answer this question, we contributed to the development of an evidence-based dietary app and evaluated its effects. The app offers personalized recipes and tips in order to reduce food waste and meat consumption, and increase the use of seasonal and plant-based products. Method: Using a mixed-methods approach, app usage data (N=2167) and quantitative data from a longitudinal online questionnaire (T1-T3: N=56) were combined with in-depth interviews with users (N=6) and app-developers (N=3). Findings: In the interviews, users evaluated the personalized recipe-suggestions positively. An additional search (e.g. recipes with certain ingredients) was often no longer necessary to find a suitable recipe. The app metrics showed positive correlations between frequent app usage and the motivation to reduce food waste (r=.06, p<.05) as well as the motivation to use seasonal products (r=.16, p<.01). The survey data showed that participants’ initial confidence to implement new dietary behavior was a strong predictor of the implementation of new dietary behavior after three weeks of app usage (β≥.49, p≤.01, R2 = .66). Last, the development team emphasized the benefits of an iterative approach in which regular user feedback informed the further development process of the app. Discussion: The results of this research show that it can be effective to combine health- and sustainability-focused diet interventions. These interventions should be personalized and aim to increase users’ confidence to perform new dietary behavior.
    06 - Präsentation
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    Affect or information? Examining drivers of public preferences of future energy portfolios in Switzerland
    (Elsevier, 2019) Jobin, Marilou; Visschers, Vivianne; Arvai, Joseph; Siegrist, Michael [in: Energy Research & Social Science]
    The energy transition in Switzerland, as in many other countries, aims to increase the proportion of electricity produced using renewable energy technologies. In this context, governmental agencies and other institutions have attempted to communicate the implications of (domestic) electricity systems through the use of web-based and interactive decision support systems (DSSs). Studies show that, when no additional information is provided, preferences concerning the future electricity mix are mainly driven by the affective reactions that energy technologies evoke. A question remains, however, regarding how people engage with the information provided in a DSS, as well as whether such information is influential in terms of shaping people’s choices. We asked our participants to build an electricity portfolio using a DSS, which modeled the Swiss electricity system. The participants’ political orientation and their affective reactions to different energy technologies guided their information search, as well as the choice of energy technologies within their portfolio. The attention paid to the information provided was not directly related to the participants’ portfolio choices. The selective processing of information, which was based on the participants’ prior attitudes, suggests that they target information they are already familiar with in the DSS. However, this also illustrates a caveat previously identified in motivated political reasoning, since selective information processing, together with the tendency to disconfirm information that is incongruent with prior beliefs, can lead to the polarization of previously held views. As the information provided through the DSS we tested was unable to change the participants’ affective-cognitive evaluation of energy technologies, its use should be carefully considered in light of the possible effects of consolidating existing beliefs.
    01A - Beitrag in wissenschaftlicher Zeitschrift
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    Application of multiblock modelling to identify key drivers for antimicrobial use in pig production in four European countries
    (Cambridge University Press, 2018) Backhans, Annette; Dewulf, Jeroen; Emanuelson, Ulf; Grosse Beilage, Elisabeth; Loesken, Svenja; Postma, Merel; Sjölund, Marie; Stärk, Katherina; Visschers, Vivianne; Belloc, Catherine; Collineau, Lucie; Bougeard, Stéphanie; Lehébel, Anne [in: Epidemiology and Infection]
    Antimicrobial use in pig farming is influenced by a range of risk factors, including herd characteristics, biosecurity level, farm performance, occurrence of clinical signs and vaccination scheme, as well as farmers’ attitudes and habits towards antimicrobial use. So far, the effect of these risk factors has been explored separately. Using an innovative method called multiblock partial least-squares regression, this study aimed to investigate, in a sample of 207 farrow-to-finish farms from Belgium, France, Germany and Sweden, the relative importance of the six above mentioned categories or ‘blocks’ of risk factors for antimicrobial use in pig production. Four country separate models were developed; they showed that all six blocks provided useful contribution to explaining antimicrobial use in at least one country. The occurrence of clinical signs, especially of respiratory and nervous diseases in fatteners, was one of the largest contributing blocks in all four countries, whereas the effect of the other blocks differed between countries. In terms of risk management, it suggests that a holistic and country-specific mitigation strategy is likely to be more effective. However, further research is needed to validate our findings in larger and more representative samples, as well as in other countries.
    01A - Beitrag in wissenschaftlicher Zeitschrift
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    How to improve consumers' environmental sustainability judgements of foods
    (Elsevier, 2018) Lazzarini, Gianna A.; Visschers, Vivianne; Siegrist, Michael [in: Journal of Cleaner Production]
    Food production and consumption account for approximately one-third of households' environmental impact. Consumers thus play a major role in the shift towards more sustainable foods and diets. An overall sustainability label or simple guidelines may enable consumers to make more environmentally friendly food choices, but whether such information-based tools improve consumers' ability to choose environmentally sustainable foods has not been empirically investigated. This study's online choice task experiment shows that eco-labels and guidelines marginally increased consumers' accuracy in selecting environmentally friendly foods. Respondents adhered, however, more to guidelines than to eco-labels and led to choices with lower environmental impact. In addition, respondents showed several misconceptions related to the environmental performance of protein products, which were resistant to both eco-labels and guidelines. These findings suggest that new, costly labels may not improve consumers' environmental judgements. Instead, addressing consumers' misconceptions and finding ways to promote environmentally sustainable food purchases is essential.
    01A - Beitrag in wissenschaftlicher Zeitschrift
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    Differences in risk perception between hazards and between individuals
    (Springer, 2018) Visschers, Vivianne; Siegrist, Michael; Raue, Martina; Lermer, Eva; Streicher, Bernhard [in: Psychological Perspectives on Risk and Risk Analysis]
    How people think about a hazard often deviates from experts’ assessment of its probability and severity. The aim of this chapter is to clarify how people perceive risks. We thereby focus on two important research lines: (1) research on the psychometric paradigm, which explains variations between the perceptions of different risks, and (2) research on factors that may determine an individual’s perception of a risk (i.e., perceived benefits, trust, knowledge, affective associations, values, and fairness). Findings from studies about various risks (e.g., genetically modified organisms, food additives, and climate change) are reviewed in order to provide practical implications for risk management and communication. Overall, this chapter shows that the roles of benefit perception, trust, knowledge, affective associations, personal values, and fairness are not always straightforward; different factors appear involved in the perception of different hazards. We recommend practitioners, when they encounter a new hazard, to consult previous studies about similar hazards in order to identify the factors that describe the public’s perception of the new
    04A - Beitrag Sammelband
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    Judgments under uncertainty: evaluations of univocal, ambiguous and conflicting probability information
    (Routledge, 2017) Visschers, Vivianne [in: Journal of Risk Research]
    People often have to make decisions about problems that not only involve a probability of a risk, but also an uncertainty around this probability. In this paper, uncertainty that arises through a lack of knowledge (i.e. ambiguity) is distinguished from uncertainty that results from conflicting knowledge on the hazard's probability of occurring.
    01A - Beitrag in wissenschaftlicher Zeitschrift
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    A comparison of pig farmers' and veterinarians' perceptions and intentions to reduce antimicrobial usage in six European countries
    (Wiley, 2016) Visschers, Vivianne; Backhans, Annette; Collineau, Lucie; Loesken, Svenja; Nielsen, Elisabeth; Postma, Merel; Belloc, Catherine; Dewulf, Jeroen; Emanuelson, Ulf; Grosse Beilage, Elisabeth; Siegrist, Michael; Sjölund, Marie; Stärk, Katherina [in: Zoonoses and Public Health]
    Antimicrobial (AM) resistance is an increasing problem in human and veterinary medicine. To manage this problem, the usage of AM should be reduced in pig farming, as well as in other areas. It is important to investigate the factors that influence both pig farmers' and veterinarians' intentions to reduce AM usage, which is a prerequisite for developing intervention measures. We conducted a mail survey among pig farmers (N = 1,294) and an online survey among veterinarians (N = 334) in Belgium, Denmark, France, Germany, Sweden and Switzerland. The farmers' survey assessed the perceived risks and benefits of and need for AM usage; the intention to reduce AM usage; farmers' efficacy (i.e. perception of their ability to reduce AM usage); support from their veterinarian; and the future reduction potential of AM usage. Additionally, self-reported reduction behaviours, the perceived farmers' barriers to reduce AM usage and relationships with farmers were assessed in the veterinarians' survey. The results showed that farmers and veterinarians had similar perceptions of the risks and benefits of AM usage. Veterinarians appeared to be more optimistic than pig farmers about reducing AM usage in pig farming. Farmers believed that their efficacy over AM reduction was relatively high. Farmers' intention to reduce AM usage and veterinarians' self-reported reduction behaviours were mainly associated with factors concerning the feasibility of reducing AM usage. To promote prudent AM usage, pig farmers should learn and experience how to reduce usage by applying alternative measures, whereas veterinarians should strengthen their advisory role and competencies to support and educate farmers.
    01A - Beitrag in wissenschaftlicher Zeitschrift