L. Rook
Please Note
40 records found
1
This is important because searching for information online is not always simple. Information is spread across many sources, differs in quality, and often requires users to decide when they have searched enough. Some users continue searching until they believe they have found the best possible option; these users are known as maximizers. Others stop once they find an option that is good enough; these users are known as satisficers. Since these differences may affect how people search and evaluate outcomes, this thesis compares not only the accuracy of different search tools, but also user satisfaction and the role of personality.
The goal of this thesis is to compare how LLM-based search and traditional search engines support information retrieval. Specifically, the study examines whether the search tool affects result accuracy and user satisfaction, and whether these effects are moderated by two components of maximization: maximization goal and maximization strategy. Maximization goal refers to the desire to choose the best possible option, while maximization strategy refers to the tendency to search extensively before making a decision. The study hypothesized that LLM-based search would lead to lower accuracy than traditional search, but higher satisfaction. It was also expected that maximization goal and strategy would moderate these effects.
To test these hypotheses, a live experiment was conducted with participants recruited at TU Delft and Leiden University. Participants were randomly assigned to one of two search tools: DuckDuckGo™, representing a traditional search engine, or OpenRouter™ with Grok™ 4.3, representing an LLM-based search environment. Before completing the search tasks, participants filled in a personality questionnaire measuring maximization goal and maximization strategy. They then completed two independent tasks using their assigned tool. The first task required participants to identify a former TU Delft student and answer questions about the student’s thesis and related academic publication. The second task required participants to identify apple conditions from images. After each task, participants submitted their answer and rated their satisfaction with the search process.
The results showed no significant difference in accuracy between the LLM and search engine conditions. Therefore, the hypothesis that LLM-based search would lead to lower accuracy was not supported. However, accuracy was very low across both tasks, which makes this result difficult to interpret. The tasks likely created a floor effect, meaning that they were too difficult to clearly detect differences between the tools. Therefore, this finding should not be interpreted as evidence that LLMs and search engines are equally accurate in general.
For satisfaction, the results were clearer. Participants using the LLM reported significantly higher satisfaction than participants using DuckDuckGo™. Descriptive behavioral results also showed that LLM users completed the tasks faster, entered fewer queries, and visited fewer external websites. Search engine users, in contrast, searched more broadly across websites and domains. This supports the idea that traditional search engines encourage navigation across multiple sources, whereas LLMs concentrate the search process within a single conversational interface.
The moderation analyses showed that neither maximization goal nor maximization strategy moderated the relationship between search tool and accuracy. In other words, users’ maximization tendencies did not significantly change how accurately they performed with either DuckDuckGo™ or the LLM. For satisfaction, maximization goal also did not significantly moderate the effect of search tool. Maximization strategy, however, did moderate the relationship between search tool and satisfaction. The satisfaction advantage of the LLM was strongest among participants low in maximization strategy, but disappeared among participants high in maximization strategy. This suggests that users who do not naturally search extensively may benefit more from the guided structure of an LLM. Users high in maximization strategy may instead value comparison, visible alternatives, and control over the search process, which are more naturally supported by traditional search engines.
Overall, this thesis shows that LLMs can make information retrieval more satisfying, but that higher satisfaction does not automatically imply higher accuracy. The findings suggest that LLM-based systems should include verification mechanisms, such as source links, uncertainty indicators, or prompts encouraging users to check important outputs. They also suggest that future CARS and search platforms may benefit from adapting to users’ decision-making styles. As LLMs become increasingly integrated into search and recommender systems, it is important to understand not only when these tools work, but also for whom they work best. ...
This is important because searching for information online is not always simple. Information is spread across many sources, differs in quality, and often requires users to decide when they have searched enough. Some users continue searching until they believe they have found the best possible option; these users are known as maximizers. Others stop once they find an option that is good enough; these users are known as satisficers. Since these differences may affect how people search and evaluate outcomes, this thesis compares not only the accuracy of different search tools, but also user satisfaction and the role of personality.
The goal of this thesis is to compare how LLM-based search and traditional search engines support information retrieval. Specifically, the study examines whether the search tool affects result accuracy and user satisfaction, and whether these effects are moderated by two components of maximization: maximization goal and maximization strategy. Maximization goal refers to the desire to choose the best possible option, while maximization strategy refers to the tendency to search extensively before making a decision. The study hypothesized that LLM-based search would lead to lower accuracy than traditional search, but higher satisfaction. It was also expected that maximization goal and strategy would moderate these effects.
To test these hypotheses, a live experiment was conducted with participants recruited at TU Delft and Leiden University. Participants were randomly assigned to one of two search tools: DuckDuckGo™, representing a traditional search engine, or OpenRouter™ with Grok™ 4.3, representing an LLM-based search environment. Before completing the search tasks, participants filled in a personality questionnaire measuring maximization goal and maximization strategy. They then completed two independent tasks using their assigned tool. The first task required participants to identify a former TU Delft student and answer questions about the student’s thesis and related academic publication. The second task required participants to identify apple conditions from images. After each task, participants submitted their answer and rated their satisfaction with the search process.
The results showed no significant difference in accuracy between the LLM and search engine conditions. Therefore, the hypothesis that LLM-based search would lead to lower accuracy was not supported. However, accuracy was very low across both tasks, which makes this result difficult to interpret. The tasks likely created a floor effect, meaning that they were too difficult to clearly detect differences between the tools. Therefore, this finding should not be interpreted as evidence that LLMs and search engines are equally accurate in general.
For satisfaction, the results were clearer. Participants using the LLM reported significantly higher satisfaction than participants using DuckDuckGo™. Descriptive behavioral results also showed that LLM users completed the tasks faster, entered fewer queries, and visited fewer external websites. Search engine users, in contrast, searched more broadly across websites and domains. This supports the idea that traditional search engines encourage navigation across multiple sources, whereas LLMs concentrate the search process within a single conversational interface.
The moderation analyses showed that neither maximization goal nor maximization strategy moderated the relationship between search tool and accuracy. In other words, users’ maximization tendencies did not significantly change how accurately they performed with either DuckDuckGo™ or the LLM. For satisfaction, maximization goal also did not significantly moderate the effect of search tool. Maximization strategy, however, did moderate the relationship between search tool and satisfaction. The satisfaction advantage of the LLM was strongest among participants low in maximization strategy, but disappeared among participants high in maximization strategy. This suggests that users who do not naturally search extensively may benefit more from the guided structure of an LLM. Users high in maximization strategy may instead value comparison, visible alternatives, and control over the search process, which are more naturally supported by traditional search engines.
Overall, this thesis shows that LLMs can make information retrieval more satisfying, but that higher satisfaction does not automatically imply higher accuracy. The findings suggest that LLM-based systems should include verification mechanisms, such as source links, uncertainty indicators, or prompts encouraging users to check important outputs. They also suggest that future CARS and search platforms may benefit from adapting to users’ decision-making styles. As LLMs become increasingly integrated into search and recommender systems, it is important to understand not only when these tools work, but also for whom they work best.
The research employs a qualitative methodology, combining a comprehensive literature review, desk research, and semi-structured interviews with industry experts. The literature review establishes the theoretical framework, highlighting the transition from Old Space to New Space, characterized by increased private sector involvement, innovative business models, and new financing methods. The desk research provides up-to-date industry data, while the interviews offer practical insights and expert perspectives, enriching the analysis.
Key findings reveal that the micro launch industry's perceived market bubble is driven by speculative investor behavior, cognitive biases, and high liquidity from private investments, leading to inflated asset prices and unrealistic market expectations. The study identifies democratized access to space and substantial institutional support as significant growth drivers, while high entry barriers, competition from established players, and regulatory challenges pose substantial hurdles.
The benchmarking analysis indicates that while micro launchers offer unique value propositions such as dedicated and flexible launch services, they face intense competition from larger launch vehicles and alternative solutions like rideshare missions and orbital transfer vehicles. This competitive landscape underscores the necessity for continuous innovation and strategic agility among micro launch companies.
For SmallSat manufacturers, the evolving trends in the micro launch industry have profound implications. Reduced launch costs and increased access to space shift the focus from minimizing satellite mass to optimizing mission performance and reliability. However, the uncertainty surrounding the micro launch sector highlights the importance of strategic planning and diversification in investment decisions.
The thesis concludes with strategic insights for industry stakeholders, emphasizing the need for collaborative efforts, innovative approaches, and effective policy frameworks to navigate the complexities of the micro launch market. These findings contribute to the broader understanding of market dynamics within high-tech industries and offer practical guidance for sustaining growth and competitiveness in the rapidly evolving space sector. ...
The research employs a qualitative methodology, combining a comprehensive literature review, desk research, and semi-structured interviews with industry experts. The literature review establishes the theoretical framework, highlighting the transition from Old Space to New Space, characterized by increased private sector involvement, innovative business models, and new financing methods. The desk research provides up-to-date industry data, while the interviews offer practical insights and expert perspectives, enriching the analysis.
Key findings reveal that the micro launch industry's perceived market bubble is driven by speculative investor behavior, cognitive biases, and high liquidity from private investments, leading to inflated asset prices and unrealistic market expectations. The study identifies democratized access to space and substantial institutional support as significant growth drivers, while high entry barriers, competition from established players, and regulatory challenges pose substantial hurdles.
The benchmarking analysis indicates that while micro launchers offer unique value propositions such as dedicated and flexible launch services, they face intense competition from larger launch vehicles and alternative solutions like rideshare missions and orbital transfer vehicles. This competitive landscape underscores the necessity for continuous innovation and strategic agility among micro launch companies.
For SmallSat manufacturers, the evolving trends in the micro launch industry have profound implications. Reduced launch costs and increased access to space shift the focus from minimizing satellite mass to optimizing mission performance and reliability. However, the uncertainty surrounding the micro launch sector highlights the importance of strategic planning and diversification in investment decisions.
The thesis concludes with strategic insights for industry stakeholders, emphasizing the need for collaborative efforts, innovative approaches, and effective policy frameworks to navigate the complexities of the micro launch market. These findings contribute to the broader understanding of market dynamics within high-tech industries and offer practical guidance for sustaining growth and competitiveness in the rapidly evolving space sector.
A framework to transfer information from sales to operations in new-build yachting
A case study in an Engineer-to-Order environment
Keywords: Information Management, Sales & Operations Planning (S\&OP) process, commercial, operational, information transfer framework, Engineer-to-order, Structured information sharing, luxury goods, and case study.
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Keywords: Information Management, Sales & Operations Planning (S\&OP) process, commercial, operational, information transfer framework, Engineer-to-order, Structured information sharing, luxury goods, and case study.
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This study aimed to examine to what extent attribute frames steer human food choices toward healthy ones, and in what way self-control levels influence that relationship. An online experiment was conducted, utilizing attribute frames as the independent variable, food choices as the dependent variable, and depletion sensitivity and trait self-control as moderating variables. Participants were randomly provided seven different food options, each of which came with an attribute framing message, to evaluate the effects of positive and negative attribute frames on healthy food choices. The Depletion Sensitivity Scale (DSS), and Brief Self-Control Scale (BSCC) were used to assess the individuals’ levels of depletion sensitivity and trait self-control, in respect. The findings revealed that positive attribute frames effectively encouraged healthy food choices, while negative frames had a relatively lower impact. Depletion sensitivity moderated the relationship between attribute frames and healthy food choices, suggesting that individuals with low depletion sensitivity were more likely to select healthy options under positive framing conditions. However, no significant moderating effect of trait self-control was observed. Lastly, the relationship between attribute frames and food preference was found to be significantly moderated by gender differences. In conclusion, this study provided evidence supporting the influence of attribute frames on healthy food choices and the moderating role of depletion sensitivity on this relationship. The significance of considering gender differences in the analysis of the effect of attribute frames on food preferences was also illustrated. ...
This study aimed to examine to what extent attribute frames steer human food choices toward healthy ones, and in what way self-control levels influence that relationship. An online experiment was conducted, utilizing attribute frames as the independent variable, food choices as the dependent variable, and depletion sensitivity and trait self-control as moderating variables. Participants were randomly provided seven different food options, each of which came with an attribute framing message, to evaluate the effects of positive and negative attribute frames on healthy food choices. The Depletion Sensitivity Scale (DSS), and Brief Self-Control Scale (BSCC) were used to assess the individuals’ levels of depletion sensitivity and trait self-control, in respect. The findings revealed that positive attribute frames effectively encouraged healthy food choices, while negative frames had a relatively lower impact. Depletion sensitivity moderated the relationship between attribute frames and healthy food choices, suggesting that individuals with low depletion sensitivity were more likely to select healthy options under positive framing conditions. However, no significant moderating effect of trait self-control was observed. Lastly, the relationship between attribute frames and food preference was found to be significantly moderated by gender differences. In conclusion, this study provided evidence supporting the influence of attribute frames on healthy food choices and the moderating role of depletion sensitivity on this relationship. The significance of considering gender differences in the analysis of the effect of attribute frames on food preferences was also illustrated.
To reach the objective of the present research, an online survey was conducted among Chinese university students, which consists of GAD-7, PHQ-8, BIS/BAS, and PANAS questionnaires, followed by a writing task to describe their feelings about university life and one anxious moment happened in the university. Finally, demographics were assessed. All the sample data were exported into .csv format and imported into the software JASP (JASP, 2017). And the text of the writing task was uploaded on LIWC 2022 software (LIWC, 2022) package, and on the statistical software SPSS for additional analyses.
Through the experiment, the main Research Question and Sub-Research Questions were answered and all hypotheses were accepted. By reflecting on the whole thesis, some limitations of the current research were pointed out and some suggestions were proposed for future work. ...
To reach the objective of the present research, an online survey was conducted among Chinese university students, which consists of GAD-7, PHQ-8, BIS/BAS, and PANAS questionnaires, followed by a writing task to describe their feelings about university life and one anxious moment happened in the university. Finally, demographics were assessed. All the sample data were exported into .csv format and imported into the software JASP (JASP, 2017). And the text of the writing task was uploaded on LIWC 2022 software (LIWC, 2022) package, and on the statistical software SPSS for additional analyses.
Through the experiment, the main Research Question and Sub-Research Questions were answered and all hypotheses were accepted. By reflecting on the whole thesis, some limitations of the current research were pointed out and some suggestions were proposed for future work.
Mental disorders are now becoming prevalent illnesses. More than 1 billion people globally were affected by mental and addictive disorders in 2016, which caused 7% of all global burden of disease (Rehm & Shield, 2019). Among those mental disorders, anxiety disorders and depression rank at the top. GAD is the most common anxiety disorder form in primary care, and the burden caused by GAD is severe in terms of decreased work productivity and increased health care utilization. The present study pivoted around GAD, studying the intersection between motivational arousal, language, and sympathetic activation. A Randomized Controlled Trial (RCT) was designed and undertaken. The findings were satisfactory: Different arousal manipulation led to different language patterns of students. For example, negative (avoidance) arousal triggered fatigue-related words use. GAD inhibited motivational arousal effect on language, which extended the previous study that GAD people have ’diminished physiological flexibility’. Furthermore, sympathetic activation was observed during arousal manipulation, and the variability of Heart Rate (HR) and Heart Rate Variability (HRV) was significantly affected. Lastly, the ’diminished physiological flexibility’ of GAD people was also shown in the present study: GAD students experienced little change in Electrodermal Activity (EDA), HR, and HRV under motivational arousal manipulation ...
Mental disorders are now becoming prevalent illnesses. More than 1 billion people globally were affected by mental and addictive disorders in 2016, which caused 7% of all global burden of disease (Rehm & Shield, 2019). Among those mental disorders, anxiety disorders and depression rank at the top. GAD is the most common anxiety disorder form in primary care, and the burden caused by GAD is severe in terms of decreased work productivity and increased health care utilization. The present study pivoted around GAD, studying the intersection between motivational arousal, language, and sympathetic activation. A Randomized Controlled Trial (RCT) was designed and undertaken. The findings were satisfactory: Different arousal manipulation led to different language patterns of students. For example, negative (avoidance) arousal triggered fatigue-related words use. GAD inhibited motivational arousal effect on language, which extended the previous study that GAD people have ’diminished physiological flexibility’. Furthermore, sympathetic activation was observed during arousal manipulation, and the variability of Heart Rate (HR) and Heart Rate Variability (HRV) was significantly affected. Lastly, the ’diminished physiological flexibility’ of GAD people was also shown in the present study: GAD students experienced little change in Electrodermal Activity (EDA), HR, and HRV under motivational arousal manipulation
From the data it was confirmed that the VR induced stress in the participants. The data for heart rate, electrodermal activity, and heart rate variability showed an increase in stress level during the VR; Temperature did not show a difference. From the linear regression analysis done, no significant influence of stress on responses to moral dilemmas and a significant influence of personality type was confirmed.
The possibilities of VR in the field of psychology has the potential to improve research regarding stress. VR can be used as a coping method but also as a stress inducing activity. Future research should focus on discovering new possibilities for VR to be used. By improving the research about stress, an improvement of our lifes will follow. ...
From the data it was confirmed that the VR induced stress in the participants. The data for heart rate, electrodermal activity, and heart rate variability showed an increase in stress level during the VR; Temperature did not show a difference. From the linear regression analysis done, no significant influence of stress on responses to moral dilemmas and a significant influence of personality type was confirmed.
The possibilities of VR in the field of psychology has the potential to improve research regarding stress. VR can be used as a coping method but also as a stress inducing activity. Future research should focus on discovering new possibilities for VR to be used. By improving the research about stress, an improvement of our lifes will follow.
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Consumer Adoption of Open Banking Products and Services
The influence of psychological ownership of data on consumer adoption of open banking products
Previous studies have shown that the success of open banking depends on: the safe transfer of the financial data and on the control consumers have over their data. Moreover, literature around the disclosing of financial data has demonstrated that consumers are unwilling to share their data, with privacy concerns being the dominant factor. Further, the new data economy brings a lot of around who actually owns the data and what data ownership leads to.
To explore the adoption of open banking among consumers, this study combined the technology acceptance model with external factors related to consumer personality attributes. Through intensive literature review, three dimensions are identified as crucial: psychological ownership, user’s privacy concerns, and technology readiness. A conceptual framework was developed along with nine hypotheses. The data was collected via an online survey. The reliability and validity of all the constructs were assessed. The hypotheses were tested through structural equation modeling using the SmartPLS software.
The results of the analysis indicated that the conceptual model was a good fit. The analysis indicated that there is a strong and significant effect on the intention to use open banking products and services. Specifically, perceived usefulness and perceived ease of use were important predictors for intention to use. Although psychological ownership had a negative effect on the intention to use, it showed a significant total effect through the mediating effects of perceived usefulness and ease of use. While the results of privacy concerns were insignificant, the technology readiness construct registered a total positive effect through the mediating role of the technology acceptance model on the intention to use. These findings allow the understanding of what affects the consumer’s intention to use open banking products.
The study supports the literature by being the first study to include the construct of psychological ownership to the technology acceptance model. Although the results are quite encouraging, the generalization should not be based on one single study. Future studies could use these findings to explore more the effect of psychological ownership on the disclosing of personal and financial data. Furthermore, by being a pioneer in the topic of open banking, the study provides banks and financial organizations with new insights on the consumers’ adoption of open banking products and services. ...
Previous studies have shown that the success of open banking depends on: the safe transfer of the financial data and on the control consumers have over their data. Moreover, literature around the disclosing of financial data has demonstrated that consumers are unwilling to share their data, with privacy concerns being the dominant factor. Further, the new data economy brings a lot of around who actually owns the data and what data ownership leads to.
To explore the adoption of open banking among consumers, this study combined the technology acceptance model with external factors related to consumer personality attributes. Through intensive literature review, three dimensions are identified as crucial: psychological ownership, user’s privacy concerns, and technology readiness. A conceptual framework was developed along with nine hypotheses. The data was collected via an online survey. The reliability and validity of all the constructs were assessed. The hypotheses were tested through structural equation modeling using the SmartPLS software.
The results of the analysis indicated that the conceptual model was a good fit. The analysis indicated that there is a strong and significant effect on the intention to use open banking products and services. Specifically, perceived usefulness and perceived ease of use were important predictors for intention to use. Although psychological ownership had a negative effect on the intention to use, it showed a significant total effect through the mediating effects of perceived usefulness and ease of use. While the results of privacy concerns were insignificant, the technology readiness construct registered a total positive effect through the mediating role of the technology acceptance model on the intention to use. These findings allow the understanding of what affects the consumer’s intention to use open banking products.
The study supports the literature by being the first study to include the construct of psychological ownership to the technology acceptance model. Although the results are quite encouraging, the generalization should not be based on one single study. Future studies could use these findings to explore more the effect of psychological ownership on the disclosing of personal and financial data. Furthermore, by being a pioneer in the topic of open banking, the study provides banks and financial organizations with new insights on the consumers’ adoption of open banking products and services.
The Psychology Behind Diet
Assessing the Impact of Emotion Regulation and Type-D Personality Traits on Dietary Choices
Personalized Dyadic Chatbot Conversations
The influence of human and chatbot personality on customer satisfaction within the e-commerce domain
The added value of having multiple options to travel to
A case study in Spain
Personality and Influence
The Relationship Between Personality Aspects and Cialdini's Influence Styles
Overcoming the ethical challenges of cause marketing:
A qualitative exploration in the Dutch services sector