Published on 12.08.19 in Vol 8, No 3 (2019): Jul-Sep
Preprints (earlier versions) of this paper are available at http://preprints.jmir.org/preprint/13619, first published Feb 04, 2019.
Influence of Enthusiastic Language on the Credibility of Health Information and the Trustworthiness of Science Communicators: Insights From a Between-Subject Web-Based Experiment
Background: To decide whether online health information is reliable, information seekers apply 2 stretegies: first, information seekers can make credibility judgments by using their prior knowledge to evaluate the validity of the encountered health claim. Second, instead of evaluating the health claim itself, information seekers can make trustworthiness judgments by evaluating the character of the information source. In recent years, information givers from various professions have begun to use enthusiastic language to disseminate their information and persuade their audiences.
Objective: To systematically explore this phenomenon, the goal of this study was to answer the following research questions: (1) does an enthusiastic language style, in comparison with a neutral language style, increase the trustworthiness of a person arguing in an online health forum and the credibility of his or her information? (2) does working for a university, in comparison with working for a lobbying organization, increase the trustworthiness of a person arguing in an online health forum and the credibility of his or her information? (3) does working for a university in combination with using an enthusiastic language style result in especially high trustworthiness and credibility ratings?
Methods: In a 2x2 between-subject online experiment, 270 participants read a post from an online health forum and subsequently rated the trustworthiness of the forum post author and the credibility of his information. A total of 2 aspects of the forum post varied, namely the professional affiliation of the forum post author (whether the person introduced himself as a scientist or a lobbyist) and his language style (whether he used a neutral language style or an enthusiastic language style).
Results: When the forum post author used an enthusiastic language style, he was perceived as more manipulative (P<.001), less knowledgeable (P<.001), and his information was perceived as less credible (P<.001). Overall, scientists were perceived as less manipulative (P=.04) than lobbyists. Furthermore, language style and professional affiliation interacted: When the forum post author was a lobbyist, language style did not affect integrity (P=.96) and benevolence (P=.79) ratings. However, when the forum post author was a scientist, enthusiastic language led to lower integrity (P=.002) and benevolence (P<.001) ratings than neutral language.
Conclusions: The current findings illustrate that health information seekers do not just react to online health information itself. In addition, they are also sensitive to the ways in which health information is presented (“Which langue style is used to communicate health information?”) and who presents it (“Who does the health information source work for?”).
Interact J Med Res 2019;8(3):e13619
How do information seekers decide whether they can rely on online health information? The importance of this question is stressed by 2 recent developments: First, information seekers have developed diverse ways to acquire online health information , and they rely on it frequently [ ]. Second, online health information often contains misinformation [ - ] because the internet is not governed by professional editors [ , ]. Hence, information seekers constantly have to decide whether they should rely on the health information they encounter online. According to the content-source integration model [ ], 2 strategies can be applied to make such decisions. First, information seekers can make credibility judgments (first-hand evaluations) by using their prior knowledge to evaluate the validity of the encountered health information claim. Second, instead of evaluating the health information claim itself, information seekers can make trustworthiness judgments (second-hand evaluations) by evaluating the character of the information source. As most information seekers have just a bounded understanding of science, they often lack the necessary expertise to make accurate credibility judgments [ , ]. Therefore, information seekers frequently have to turn to experts and evaluate their trustworthiness [ - ]. This development gives rise to another intriguing question: Which factors influence information seekers’ credibility and trustworthiness judgments?
Language Styles and Their Relationship to Credibility and Trustworthiness
Various factors influence information seekers’ credibility and trustworthiness judgments [- ], but the language style of an information source seems to be an especially influential factor [ - ]. Thon and Jucks [ ], for example, showed that the authors of health information forum posts were rated as more trustworthy and their information as more credible when they used an everyday language style (eg, “heart attack”) instead of a technical language style (eg, “myocardial infarction”). Furthermore, Mayweg-Paus and Jucks [ ] showed that participants accepted information from an online health article to a higher degree and processed it in more depth when the article was written in a tentative language style (eg, “is presumably similar”) rather than a nontentative language style (eg, “is similar”). Tentativeness, however, does not just infuence trustworthiness and credibility judgments. In a study by Feinkohl et al [ ], participants saw an online news article about the therapeutic application of deep brain stimulation. Depending on the experimental condition, the article was accompanied by different online forum comments or no comments at all. The results showed that participants were more likely to address the tentativeness of the findings in their own forum comments if they had previously seen forum comments that addressed this issue too (for additional information on scientific tentativeness and medical research, see the study by Flemming et al [ ]). In another study, König and Jucks [ ] showed that science communicators in scientific health debates were rated as more trustworthy and their information as more credible when they used a neutral language style (eg, “a series of methodological mistakes”) instead of an aggressive language style (eg, “a series of really dumb methodological mistakes”). Besides influencing trustworthiness and credibility judgments, the use of emotional language also influences interactions in online forums and risk perceptions. For example, research showed that medical students incease their emotional language use when replying to emotional patient queries in medical forums [ ]. Furthermore, a recent study showed that emotionalization can influence risk perceptions in a science communication context [ ]. Aggressive, technical, tentative, and everyday language styles, however, are not the only language styles that are used to disseminate health information.
This Study: How Does Enthusiastic Language Influence the Credibility of Health Information and the Trustworthiness of Science Communicators?
In recent years, more and more people use enthusiastic language to disseminate information and persuade their audiences in diverse contexts. For example, Ghose et al  observed that, instead of just writing positive comments on online marketplace platforms, “buyers tend to use superlatives and highly enthusiastic language to praise a good merchant.” In another study, Barry et al [ ] pointed out that enthusiastic language is used as a persuasion tactic on commercial websites. Furthermore, enthusiastic language is nowadays often used to communicate scientific findings. Instead of using standard academic language, authors of scientific articles increasingly express their enthusiasm about their findings by including enthusiastic phrases in their article titles and texts, for example, “Fantastic beasts” [ ] and “The Incredible Shrinking Spindle” [ ].
So far, it is not clear why so many people use enthusiastic language when communicating information. One reason might be that enthusiasm is often encouraged in educational settings because it has been linked to various positive outcomes . For example, teacher enthusiasm is linked to students’ enjoyment [ ], interest [ ], achievement [ ], motivation, and vitality [ ]. Therefore, information givers might think that using enthusiastic language to communicate information makes them especially effective and follows best-practice examples. But is this true? Interestingly, no research so far has systematically explored whether enthusiastic language influences the trustworthiness of an information source and the credibility of his or her information. And even if it does, would using enthusiastic language be equally effective for people from different professions? Burgoon et al [ ], for example, argue in the context of Language Expectancy Theory that “highly credible communicators have the freedom (wide bandwidth) to select varied language strategies and compliance-gaining techniques in developing persuasive messages, whereas low-credible communicators must conform to more limited language options if they wish to be effective.” Following this argumentation, one would expect that high-credibility communicators such as scientists would benefit more from the use of an enthusiastic language style than low-credibility communicators such as lobbyists. To test these hypotheses, we developed a between-subject online experiment. In the experiment, participants read a post from an online health forum and subsequently rated the trustworthiness of the forum post author and the credibility of his information. We chose online health forums because they typically allow users from diverse educational and professional backgrounds to exchange information in an unrestricted way. Furthermore, diverse research findings suggest that information seekers frequently rely on online forums to aquire health information [ - ]. Within the forum post, we varied the professional affiliation of the forum post author (whether the person introduced himself as a scientist or a lobbyist) and his language style (whether he used a neutral language style or an enthusiastic language style). The goal was to test the following hypotheses:
Hypothesis 1: An enthustiastic language style, in comparision with a neutral language style, increases the trustworthiness of a person arguing in an online health forum and the credibility of his information.
Hypothesis 2: Working for a university, in comparison with working for a lobbying organization, increases the trustworthiness of a person arguing in an online health forum and the credibility of his information.
Hypothesis 3: Working for a university in combination with using an enthusiastic language style results in especially high trustworthiness and credibility ratings.
Design and Material
We used a 2 (language style: neutral language vs enthusiastic language) x 2 (professional affiliation: scientist vs lobbyist) between-subject experimental design, resulting in 4 experimental conditions. In each experimental condition, participants saw 2 online forum posts: a question post and an answer post. The 2 posts were embedded in a screenshot of a website. The URL of the website indicated that it was an online health forum. In the question post, a woman stated that there currently is a controversial debate about whether functional magnetic resonance imaging and artificial intelligence technologies can be combined to improve medical diagnoses. Following this, she asked whether anybody could explain the technologies to her. The question post was written in a neutral language style and was the same in all 4 experimental conditions.shows the text of the question post. The textbox shows an English translation of the German post. Therefore, the translated version may not appear as authentic to native English speakers as the original version appears to native German speakers. The original German version of the question post can be obtained from the authors upon request. In the answer post, a man introduced himself and explained the basics of the functional magnetic resonance imaging technology. Following this, he described the results of a study [ ] that had combined functional magnetic resonance imaging and artificial intelligence technologies. The experimental manipulations were realized in the answer post. Depending on the experimental condition, the answer post was written either in (1) a neutral language style or (2) an enthusiastic language style. Furthermore, the author of the answer post introduced himself either as (1) a scientist who worked for an imaging technology institute at a university or (2) a lobbyist who worked at an imaging technology lobbying organization. shows the text of the answer post with the experimental manipulation. The enthusiastic language style version of the answer post contained the words and phrases printed in italics and the neutral language style version did not contain these words and phrases. The textbox shows an English translation of the German post. Therefore, the translated version may not appear as authentic to native English speakers as the original version appears to native German speakers. The original German version of the post can be obtained from the authors upon request.
The experiment was conducted online using the Questback Enterprise Feedback Suite Survey platform for data collection. Before the experiment started, participants were told that the experiment would address the communication of information in online forums. Furthermore, they were informed about the general procedure of the upcoming experiment and that they could end the experiment at any time. To start the experiment, participants had to indicate that they had read all provided information and that they agreed to take part in the experiment. On the remaining pages, participants indicated their age, gender, whether they studied at the bachelor’s or master’s level, the university where they studied, their study subjects, and the semester they were currently in. Furthermore, they answered the control measures (see section “Control Measures”). Following this, participants were randomly assigned to 1 of the 4 experimental conditions and were presented with the corresponding online forum posts (see section “Design and Material”). After reading the forum posts, participants answered the dependent measures (see section “Dependent Measures”). After answering the dependent measures, participants answered the manipulation check question (see section “Manipulation Check”) and were debriefed. They were told about the manipulations of the experiment and that they could contact the leading scientist if they had any further questions or comments. Furthermore, they could choose to leave their information to get reimbursed for their participation. The experiment was designed to comply with the ethical guidelines developed by the American Psychological Association and the German Psychological Society.
German university students enrolled in diverse majors from the humanities and sciences were contacted via email and social network sites and received 5 Euro for participating in the online experiment. Participants who indicated at the end of the study that they answered the questions honestly and completed the study without interruption and technical problems were included in data analyses. The sample contained 270 (207 female, 63 male) students (149 undergraduate students, 121 graduate students) with an average age of 23 years (mean 23.39, SD 3.04). Furthermore, the average participant was enrolled in their study program for 7 semesters (mean 6.73, SD 3.96) and took 12 min (mean 11.51, SD 5.09) to complete the study.
A total of 3 control measures were included to assess whether the experimental groups differed in regard to characteristics that could affect the study results. It is possible that people who frequently use online forums are better able to identify the quality of online forum posts and their content than people who just occasionally use online forums. Therefore, participants answered the questions “How often do you visit Internet forums?” (general use) and “How often do you visit Internet forums to learn something new or acquire new skills?” (educational use) on a scale ranging from 1 (very rarely) to 7 (very often). Furthermore, it is possible that people who are well informed about a topic make different credibility and trustworthiness judgments than people who are less informed about the same topic. Therefore, participants answered the question “How much do you know about functional magnetic resonance imaging and deep learning?” (prior knowledge) on a scale ranging from 1 (very little) to 7 (very much).
To check whether the language style manipulation was successful, participants answered the question “How would you describe Johannes Becker’s choice of words?” on a scale ranging from 1 (neutral) to 7 (extremely enthusiastic). In addition, we assessed the strength of the experimental manipulations by asking the participants whether they remembered the language style and professional affiliation of the answer post author. To assess whether the participants remembered the language style, they were asked whether certain enthusiastic expressions were used in the answer post. Participants could chose between “Yes,” “No,” and “I do not know.” To assess whether the participants remembered the professional affiliation of the answer post author, they were asked “For whom did Johannes Becker work?” Participants could choose between “Institute for Imaging Technology at the University of Bochum,” “Association of Imaging Technology-Producing Industries in Bochum,” and “I do not know.”
For each dependent measure, a total score was generated by calculating the mean.
As a credibility measure of the provided information, the Message Credibility Scale  was translated and adapted. Participants indicated their agreement with 3 statements, for example, “The provided information was believable.”
The German version of the Machiavellianism Subscale from the Dirty Dozen Scale [, ] was used to assess how manipulative the forum post author was perceived to be. Participants indicated their agreement with 4 statements, for example, “Johannes Becker has used deceit or lied to get his way,” on a scale ranging from 1 (totally disagree) to 7 (totally agree).
Expertise, Integrity, and Benevolence
The Muenster Epistemic Trustworthiness Inventory  was used to assess how trustworthy the forum post author was perceived to be. Participants rated 15 items on a scale ranging from 1 (not trustworthy at all) to 7 (very trustworthy). The items measured expertise (eg, “unqualified-qualified”), benevolence (eg, “immoral-moral”), and integrity (eg, “insincere-sincere”).
For all analyses, the statistical software IBM SPSS Statistics version 25 was used. For the analyses of the dependent measures, 2-way between-subject analyses of variance were conducted with language style (neutral language vs enthusiastic language) and professional affiliation (scientist vs lobbyist) as independent variables. Type 3 sum of squares were used. For all analyses, the alpha level was set at .05. The dataset contains further variables that have not been described in this study and have not been analyzed yet because they exceed the scope of this study.
Before analyzing the dependent measures, 4 1-way between-subject analyses of variance were conducted with experimental condition as the independent variable and the control measures as dependent variables to analyze whether the participants in the 4 experimental groups differed in aspects that could influence the study results. The results showed that the participants in the 4 experimental groups did not significantly differ in regard to their general online forum use (general use: F3,266=0.817; P=.49), online forum use for educational purposes (educational use: F3,266=0.052; P=.98), and their prior knowledge (prior knowledge: F3,266=1.071; P=.36). Therefore, the 3 control measures were not included in further analyses.
Participants in the enthusiastic language style condition (mean 6.04, SD 0.95) perceived the choice of words as more enthusiastic than participants in the neutral language style condition (mean 2.37, SD 1.26); t244.992=-26.890; P<.001. Hence, the language style manipulation worked as expected. Furthermore, 252 (93%) participants correctly remembered the language style of the answer post author, and 231 (86%) correctly remembered his professional affiliation. A total of 216 (80%) participants remembered both correctly. The high remembrance rates suggest that the vast majority of participants recognized the experimental manipulations. As information seekers naturally differ in their attention to detail in real-world settings and the experimental manipulations might not need to be consciously remembered to have an effect, we included all participants in the data analyses.
and show the means and SDs of the dependent measures.
|Dependent measuresa||Language style||Professional affiliation|
|Neutral (n=133), mean (SD)||Enthusiastic (n=137), mean (SD)||P value||Scientist (n=135), mean (SD)||Lobbyist (n=135), mean (SD)||P value|
|Message credibility||5.11 (1.04)||4.48 (1.23)||<.001||4.83 (1.16)||4.75 (1.19)||.56|
|Machiavellianism||2.70 (1.17)||3.85 (1.23)||<.001||3.13 (1.28)||3.44 (1.37)||.04|
|Expertise||5.44 (0.98)||4.90 (1.19)||<.001||5.15 (1.11)||5.19 (1.13)||.75|
|Integrityb||4.67 (0.91)||4.42 (1.03)||.03||4.54 (0.92)||4.55 (1.04)||.95|
|Benevolenceb||4.40 (0.82)||4.10 (1.02)||.006||4.21 (0.94)||4.29 (0.93)||.52|
aGeneral interpretation: On the Machiavellianism scale, a low score indicates high trustworthiness and a high score indicates low trustworthiness. On all other scales, a low score indicates low trustworthiness/credibility and a high score indicates high trustworthiness/credibility. All scales ranged from 1 to 7.
bInteraction is significant; see.
|Neutral (n=67), mean (SD)||Enthusiastic (n=68), mean (SD)||P value||Neutral (n=66), mean (SD)||Enthusiastic (n=69), mean (SD)||P value|
|Integrity||4.79 (0.87)||4.28 (0.90)||.002||4.54 (0.94)||4.55 (1.13)||.96|
|Benevolence||4.50 (0.83)||3.93 (0.96)||<.001||4.31 (0.79)||4.26 (1.05)||.79|
aOn all scales, a low score indicates low trustworthiness and a high score indicates high trustworthiness. All scales ranged from 1 to 7.
There was a significant main effect of language style (F1,266=20.300; P<.001; ηp2=.071) on message credibility, indicating that enthusiastic language led to lower message credibility ratings than neutral language. There was no main effect of professional affiliation (F1,266=0.334; P=.56; ηp2=.001) and no interaction effect (F1,266=0.178; P=.67; ηp2=.001).
There was a significant main effect of language style (F1,266=62.898; P<.001; ηp2=.191) on Machiavellianism, indicating that enthusiastic language led to higher Machiavellianism ratings than neutral language. Furthermore, there was a significant main effect of professional affiliation (F1,266=4.487; P=.04; ηp2=.017) on Machiavellianism, indicating that being a lobbyist led to higher Machiavellianism ratings than being a scientist. There was no interaction effect (F1,266=0.010; P=.92; ηp2<.001).
There was a significant main effect of language style (F1,266=16.357; P<.001; ηp2=.058) on expertise, indicating that enthusiastic language led to lower expertise ratings than neutral language. There was no main effect of professional affiliation (F1,266=0.106; P=.75; ηp2<.001) on expertise and no interaction effect (F1,266=0.008; P=.93; ηp2<.001).
There was a significant main effect of language style (F1,266=4.530; P=.03; ηp2=.017) on integrity, indicating that enthusiastic language led to lower integrity ratings than neutral language. There was no main effect of professional affiliation (F1,266=0.004; P=.95; ηp2<.001) on integrity. However, the interaction was significant (F1,266=4.863; P=.03; ηp2=.018). Simple effect analysis indicated that when the forum post author was a lobbyist, language style did not affect integrity (F1,266=0.003; P=.96; ηp2<.001). However, when the forum post author was a scientist, enthusiastic language led to lower integrity ratings than neutral language (F1,266=9.392; P=.002; ηp2=.034).
There was a significant main effect of language style (F1,266=7.633; P=.006; ηp2=.028) on benevolence, indicating that enthusiastic language led to lower benevolence ratings than neutral language. There was no main effect of professional affiliation (F 1,266=0.422; P=.52; ηp2=.002) on benevolence. However, the interaction was significant (F1,266=5.679; P=.02; ηp2=.021). Simple effect analysis indicated that when the forum post author was a lobbyist, language style did not affect benevolence (F1,266=0.072; P=.79; ηp2<.001). However, when the forum post author was a scientist, enthusiastic language led to lower benevolence ratings than neutral language (F1,266=13.243; P<.001; ηp2=.047).
A total of 3 hypotheses addressed the effects of language style (neutral vs enthusiastic) and professional affiliation (scientist vs lobbyist) in online health forums. We hypothesized that an enthusiastic language style, in comparison with a neutral language style, would positively affect the trustworthiness of a forum post author and the credibility of his information. Contrary to our hypothesis, we found that when the forum post author used an enthusiastic language style, he received higher Machiavellianism ratings, lower expertise ratings, and lower message credibility ratings. Furthermore, we hypothesized that working for a university, in comparison with working for a lobbying organization, would positively affect the trustworthiness of a forum post author and the credibility of his information. The results partly confirm this hypothesis: Scientists received lower Machiavellianism ratings than lobbyists. However, the professional affiliation did not affect the other trustworthiness measures, and it did not affect the perceived credibility of the provided information. Finally, we hypothesized that working for a university in combination with using an enthusiastic language style would result in especially high trustworthiness and credibility ratings. Although the results did reveal an interaction between language style and professional affiliation, it was in the opposite direction: Contrary to our hypotheses, we found that when the forum post author was a scientist, enthusiastic language led to lower integrity ratings and lower benevolence ratings than neutral language.
Overall, even though it was not hypothesized, the results show that the enthusiastic language style decreased the trustworthiness of the forum post author and the credibility of his information. One possible reason for this finding, derived from communication accommodation theory , might be the question-answer setting in which the information exchange took place. In the experiment, the help seeker asked for advice and formulated her question in a neutral language style. Therefore, the participants might have expected an answer in an equally neutral language style and perceived the enthusiastic language style as a violation to the introduced communication rule.
Another surprising finding is that the professional affiliation of the forum post author only affected the Machiavellianism measure because previous research has found that scientists are typically perceived as benevolent, sincere, and likable . One reason for this finding might be that the author mentioned his professional affiliation just briefly at the beginning of his forum post. Hence, the manipulation might have been relatively weak.
The last unexpected finding was that scientists who used an enthusiastic language style got especially low integrity and benevolence ratings. One possible reason for this finding might be that scientists are typically perceived as being rational and objective and that this stereotypical image is not compatible with an enthusiastic language style. Lobbyists, on the other hand, might be perceived as people who relentlessly pursue a specific goal, and this stereotypical image might be more compatible with an enthusiastic language style.
Although the findings of this study highlight the importance of the language style and professional affiliation of people who are communicating health information in online settings, there are limitations to the generalizability of the results. One limitation could be the geographical location in which the experiment took place. More specifically, countries have developed different civic epistemologies (ways in which societies evaluate and discuss knowledge claims; see [, ]). Discussions in Germany, for example, typically focus on “building communally crafted expert rationales, capable of supporting a policy consensus,” whereas in the United States, “information is typically generated by interested parties and tested in public through overt confrontation between opposing, interest‐laden points of view” [ ]. Hence, information seekers in Germany may prefer neutral language styles as a constructive way of reaching a consensus. In the United States, however, informaiton seekers are used to emotionally laden discussions and therefore, may react differently to enthusiastic language styles. Another limitation could be the age of this study sample. Previous research has shown that age differences exist in regard to source monitoring and suggestibility to misinformation [ ]. Young adults, for example, who grew up with modern information technologies and have been confronted with misinformation on the internet throughout their lives, may pay more attention to relevant source information when evaluating online information. Older adults, however, may not be as critical as younger adults because of their lack of experience with misinformation on the internet and therefore, pay less attention to relevant source information.
A further limitation concerns the topic of the forum posts and the chosen study sample. According to the Elaboration Likelihood Model of Persuasion , the personal relevance of a topic influences information processing: If a topic is personally relevant, peripheral cues become less important. Therefore, participants who do not considere the topic to be personally relevant may rely more heavily on peripheral cues such as the professional affilation of the forum post author when making trustworthiness and credibility judgments. Hence, to assess the generalizability of the results, future research needs to replicate this study in different communication settings and with different populations.
When health information seekers are confronted with enthusiastic language in online forums, they may judge the information source as less trustworthy (especially when the information source is a scientist) and deem the communicated information less credible. Furthermore, health information seekers may perceive an information source as more trustworthy when he or she works for a university rather than a lobbying organization. These findings illustrate that health information seekers do not just react to health information on its own. In addition, they are also sensitive to the ways in which health information is presented (“Which language style is used to communicate health information?”) and who presents it (“Who does the health information source work for?”).
The authors would like to thank Dr Celeste Brennecka for language editing and their research assistant Hannah Meinert for her support. The authors disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: this work was supported by the German Research Foundation within the framework of the Research Training Group GRK 1712 Trust and Communication in a Digitized World. The funding was granted to the second author. The German Research Foundation had no involvement in study design, data collection, analysis and interpretation, and the decision to submit the study for publication.
LK and RJ contributed to the conceptualization of the study. LK contributed to the study design. LK was responsible for data acquisition. LK and RJ were responsible for analysis and/or interpretation of data. LK was responsible for drafting the manuscript. LK and RJ were responsible for revising the manuscript critically for important intellectual content. LK and RJ approved of the revision of the manuscript to be published.
Conflicts of Interest
- Higgins O, Sixsmith J, Barry MM, Domegan C. A Literature Review on Health Information-Seeking Behaviour on The Web: A Health Consumer and Health Professional Perspective. Stockholm: ECDC; 2011.
- Fox S, Duggan M. Pew Research Center. 2013. Health Online 2013 URL: http://www.pewinternet.org/2013/01/15/health-online-2013/ [accessed 2018-01-16] [WebCite Cache]
- Miles J, Petrie C, Steel M. Slimming on the internet. J R Soc Med 2000 May;93(5):254-257 [FREE Full text] [CrossRef] [Medline]
- Keelan J, Pavri-Garcia V, Tomlinson G, Wilson K. YouTube as a source of information on immunization: a content analysis. J Am Med Assoc 2007 Dec 5;298(21):2482-2484. [CrossRef] [Medline]
- Pandey A, Patni N, Singh M, Sood A, Singh G. YouTube as a source of information on the H1N1 influenza pandemic. Am J Prev Med 2010 Mar;38(3):e1-e3. [CrossRef] [Medline]
- Lewandowsky S, Ecker UK, Seifert CM, Schwarz N, Cook J. Misinformation and its correction: continued influence and successful debiasing. Psychol Sci Public Interest 2012 Dec;13(3):106-131. [CrossRef] [Medline]
- Metzger MJ, Flanagin AJ, Eyal K, Lemus DR, Mccann RM. Credibility for the 21st century: integrating perspectives on source, message, and media credibility in the contemporary media environment. Ann Int Commun Assoc 2003;27(1):293-335. [CrossRef]
- Stadtler M, Bromme R. The content–source integration model: a taxonomic description of how readers comprehend conflicting scientific information. In: Rapp DN, Braasch JL, editors. Processing Inaccurate Information: Theoretical and Applied Perspectives from Cognitive Science and the Educational Sciences. Cambridge: MIT Press; 2014:379-402.
- Bromme R, Goldman SR. The public's bounded understanding of science. Educ Psychol 2014 Jun 5;49(2):59-69. [CrossRef]
- Bromme R, Thomm E. Knowing who knows: laypersons' capabilities to judge experts' pertinence for science topics. Cogn Sci 2016 Jan;40(1):241-252 [FREE Full text] [CrossRef] [Medline]
- Keil FC, Stein C, Webb L, Billings VD, Rozenblit L. Discerning the division of cognitive labor: an emerging understanding of how knowledge is clustered in other minds. Cogn Sci 2008 Mar 1;32(2):259-300 [FREE Full text] [CrossRef] [Medline]
- Bromme R, Jucks R. Discourse and expertise: the challenge of mutual understanding between experts and laypeople. In: Schober MF, Rapp DN, Britt MA, editors. The Routledge Handbook of Discourse Processes. New York: Routledge; 2017:222-246.
- Bromme R, Kienhues D, Porsch T. Who knows what and who can we believe? Epistemological beliefs are beliefs about knowledge (mostly) to be attained from others. In: Bendixen LD, Feucht FC, editors. Personal Epistemology in the Classroom: Theory, Research, and Implications for Practice. Cambridge: Cambridge University Press; 2010:163-194.
- König L, Jucks R. When do information seekers trust scientific information? Insights from recipients’ evaluations of online video lectures. Int J Educ Technol High Educ 2019 Feb 13;16:1. [CrossRef]
- Choi W, Stvilia B. Web credibility assessment: conceptualization, operationalization, variability, and models. J Assoc Inf Sci Technol 2015 May 13;66(12):2399-2414. [CrossRef]
- Metzger MJ, Flanagin AJ. Psychological approaches to credibility assessment online. In: Sundar SS, editor. The Handbook of the Psychology of Communication Technology. Chichester: John Wiley & Sons; 2015:445-466.
- Pornpitakpan C. The persuasiveness of source credibility: a critical review of five decades' evidence. J Appl Soc Psychol 2004 Feb;34(2):243-281. [CrossRef]
- Thon FM, Jucks R. Believing in expertise: how authors' credentials and language use influence the credibility of online health information. Health Commun 2017 Dec;32(7):828-836. [CrossRef] [Medline]
- Jucks R, Linnemann GA, Thon FM, Zimmermann M. Trust the words: insights into the role of language in trust building in a digitalized world. In: Blöbaum B, editor. Trust and Communication in a Digitized World. Heidelberg: Springer International Publishing; 2016:225-237.
- König L, Jucks R. Hot topics in science communication: aggressive language decreases trustworthiness and credibility in scientific debates. Public Underst Sci 2019 Dec;28(4):401-416. [CrossRef] [Medline]
- Zimmermann M, Jucks R. How experts' use of medical technical jargon in different types of online health forums affects perceived information credibility: randomized experiment with laypersons. J Med Internet Res 2018 Dec 23;20(1):e30 [FREE Full text] [CrossRef] [Medline]
- Mayweg-Paus E, Jucks R. Evident or doubtful? How lexical hints in written information influence laypersons' understanding of influenza. Psychol Health Med 2015;20(8):989-996. [CrossRef] [Medline]
- Feinkohl I, Flemming D, Cress U, Kimmerle J. The impact of personality factors and preceding user comments on the processing of research findings on deep brain stimulation: a randomized controlled experiment in a simulated online forum. J Med Internet Res 2016 Mar 3;18(3):e59 [FREE Full text] [CrossRef] [Medline]
- Flemming D, Cress U, Kimmerle J. Processing the scientific tentativeness of medical research: an experimental study on the effects of research news and user comments in online media. Sci Commun 2017 Nov 3;39(6):745-770 [FREE Full text] [CrossRef]
- Bientzle M, Griewatz J, Kimmerle J, Küppers J, Cress U, Lammerding-Koeppel M. Impact of scientific versus emotional wording of patient questions on doctor-patient communication in an internet forum: a randomized controlled experiment with medical students. J Med Internet Res 2015 Nov 25;17(11):e268 [FREE Full text] [CrossRef] [Medline]
- Flemming D, Cress U, Kimmig S, Brandt M, Kimmerle J. Emotionalization in science communication: the impact of narratives and visual representations on knowledge gain and risk perception. Front Commun 2018 Jan 26;3:1-9. [CrossRef]
- Ghose A, Ipeirotis PG, Sundararajan A. Opinion mining using econometrics?: a case study on reputation systems. In: Zaenen A, van den Bosch A, editors. Proceedings of the 45th Annual Meeting of the Association of Computational Linguistics. Prague: Association for Computational Linguistics; 2007:416-423.
- Barry C, Hogan M, Torres AM. Framing or gaming? Constructing a study to explore the impact of option presentation on consumers. In: Vogel D, Guo X, Linger H, Barry C, Lang M, Schneider C, editors. Transforming Healthcare Through Information Systems. Heidelberg: Springer; 2016:111-124.
- Starling S. Evolutionary genetics: fantastic beasts - cephalopod RNA recoding. Nat Rev Genet 2017 Dec;18(6):329. [CrossRef] [Medline]
- Brownlee C, Heald R. The incredible shrinking spindle. Dev Cell 2018 Dec 21;45(4):421-423 [FREE Full text] [CrossRef] [Medline]
- Keller MM, Hoy AW, Goetz T, Frenzel AC. Teacher enthusiasm: reviewing and redefining a complex construct. Educ Psychol Rev 2015 Dec 23;28(4):743-769. [CrossRef]
- Frenzel AC, Goetz T, Lüdtke O, Pekrun R, Sutton RE. Emotional transmission in the classroom: exploring the relationship between teacher and student enjoyment. J Educ Psychol 2009;101(3):705-716. [CrossRef]
- Keller MM, Goetz T, Becker ES, Morger V, Hensley L. Feeling and showing: a new conceptualization of dispositional teacher enthusiasm and its relation to students' interest. Learn Instr 2014 Oct;33:29-38. [CrossRef]
- Kunter M, Klusmann U, Baumert J, Richter D, Voss T, Hachfeld A. Professional competence of teachers: effects on instructional quality and student development. J Educ Psychol 2013;105(3):805-820. [CrossRef]
- Patrick BC, Hisley J, Kempler T. 'What's everybody so excited about?': the effects of teacher enthusiasm on student intrinsic motivation and vitality. J Exp Educ 2000 Jan;68(3):217-236. [CrossRef]
- Burgoon M, Pauls V, Roberts DL. Language expectancy theory. In: Dillard JP, Pfau M, editors. The Persuasion Handbook: Developments in Theory and Practice. Thousand Oaks: Sage Publications; 2002:117-136.
- Barney LJ, Griffiths KM, Banfield MA. Explicit and implicit information needs of people with depression: a qualitative investigation of problems reported on an online depression support forum. BMC Psychiatry 2011 May 18;11:88 [FREE Full text] [CrossRef] [Medline]
- Bhamrah G, Ahmad S, NiMhurchadha S. Internet discussion forums, an information and support resource for orthognathic patients. Am J Orthod Dentofacial Orthop 2015 Jan;147(1):89-96. [CrossRef] [Medline]
- Kendal S, Kirk S, Elvey R, Catchpole R, Pryjmachuk S. How a moderated online discussion forum facilitates support for young people with eating disorders. Health Expect 2017 Dec;20(1):98-111 [FREE Full text] [CrossRef] [Medline]
- Sinha A, Porter T, Wilson A. The use of online health forums by patients with chronic cough: qualitative study. J Med Internet Res 2018 Dec 24;20(1):e19 [FREE Full text] [CrossRef] [Medline]
- Wen H, Shi J, Zhang Y, Lu KH, Cao J, Liu Z. Neural encoding and decoding with deep learning for dynamic natural vision. Cereb Cortex 2018 Dec 1;28(12):4136-4160. [CrossRef] [Medline]
- Appelman A, Sundar SS. Measuring message credibility: construction and validation of an exclusive scale. Journal Mass Commun Q 2015 Oct 5;93(1):59-79. [CrossRef]
- Küfner AC, Dufner M, Back MD. The dirty dozen and the wicked nine: short scales for the detection of narcissism, machiavellism and psychopathy. Diagnostica 2015 Jan;61(2):76-91. [CrossRef]
- Jonason PK, Webster GD. The dirty dozen: a concise measure of the dark triad. Psychol Assess 2010 Jun;22(2):420-432. [CrossRef] [Medline]
- Hendriks F, Kienhues D, Bromme R. Measuring laypeople's trust in experts in a digital age: the Muenster Epistemic Trustworthiness Inventory (METI). PLoS One 2015;10(10):e0139309 [FREE Full text] [CrossRef] [Medline]
- Dragojevic M, Gasiorek J, Giles H. Communication accommodation theory. In: Berger CR, Roloff ME, editors. The International Encyclopedia of Interpersonal Communication. First Edition. Hoboken: John Wiley & Sons; 2015:1-21.
- Jasanoff S. Cosmopolitan knowledge: climate science and global civic epistemology. In: Dryzek JS, Norgaard RB, Schlosberg D, editors. The Oxford Handbook of Climate Change and Society. Oxford: Oxford University Press; 2011.
- Jasanoff S. Designs on Nature: Science and Democracy in Europe and the United States. Princeton: Princeton University Press; 2005.
- Mitchell KJ, Johnson MK, Mather M. Source monitoring and suggestibility to misinformation: adult age-related differences. Appl Cogn Psychol 2002 Jan;17(1):107-119. [CrossRef]
- Petty RE, Cacioppo JT. The elaboration likelihood model of persuasion. Adv Exp Soc Psychol 1986;19:123-205. [CrossRef]
Edited by G Eysenbach; submitted 04.02.19; peer-reviewed by M Gotsis, J Kimmerle; comments to author 27.04.19; revised version received 14.06.19; accepted 14.06.19; published 12.08.19
©Lars König, Regina Jucks. Originally published in the Interactive Journal of Medical Research (http://www.i-jmr.org/), 12.08.2019.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Interactive Journal of Medical Research, is properly cited. The complete bibliographic information, a link to the original publication on http://www.i-jmr.org/, as well as this copyright and license information must be included.