A robot that says bad!: using negative and positive social feedback from a robotic agent to save energy. - Jaap Ham; Cees J. H. Midden (HRI, 2009)

Can ambient persuasive technology persuade unconsciously?: using subliminal feedback to influence energy consumption ratings of household appliances. - Jaap Ham; Cees J. H. Midden; Femke Beute (PERSUASIVE, 2009)

Using negative and positive social feedback from a robotic agent to save energy. - Cees J. H. Midden; Jaap Ham (PERSUASIVE, 2009)

Does it make a difference who tells you what to do?: exploring the effect of social agency on psychological reactance. - Maike A. J. Roubroeks; Cees J. H. Midden; Jaap Ham (PERSUASIVE, 2009)

Social influence of a persuasive agent: the role of agent embodiment and evaluative feedback. - Suzanne Vossen; Jaap Ham; Cees J. H. Midden (PERSUASIVE, 2009)

Evaluating Interface Variants on Personality Acquisition for Recommender Systems. - Greg Dunn; Jurgen Wiersema; Jaap Ham; Lora Aroyo (UMAP, 2009)

Ambient Persuasive Technology Needs Little Cognitive Effort: The Differential Effects of Cognitive Load on Lighting Feedback versus Factual Feedback. - Jaap Ham; Cees J. H. Midden (PERSUASIVE, 2010)

The Dominant Robot: Threatening Robots Cause Psychological Reactance, Especially When They Have Incongruent Goals. - Maike A. J. Roubroeks; Jaap R. C. Ham; Cees J. H. Midden (PERSUASIVE, 2010)

What Makes Social Feedback from a Robot Work? Disentangling the Effect of Speech, Physical Appearance and Evaluation. - Suzanne Vossen; Jaap Ham; Cees J. H. Midden (PERSUASIVE, 2010)

A Persuasive Robotic Agent to Save Energy: The Influence of Social Feedback, Feedback Valence and Task Similarity on Energy Conservation Behavior. - Jaap Ham; Cees J. H. Midden (ICSR, 2010)

Persuasive power in groups: the influence of group feedback and individual comparison feedback on energy consumption behavior. - Cees J. H. Midden; Hiroaki Kimura; Jaap Ham; Tatsuo Nakajima; Mieke Kleppe (PERSUASIVE, 2011)

Unconscious persuasion needs goal-striving: the effect of goal activation on the persuasive power of subliminal feedback. - Peter A. M. Ruijten; Cees J. H. Midden; Jaap Ham (PERSUASIVE, 2011)

Attitude towards Robots Depends on Interaction But Not on Anticipatory Behaviour. - Raymond H. Cuijpers; Maarten T. Bruna; Jaap R. C. Ham; Elena Torta (ICSR, 2011)

Making Robots Persuasive: The Influence of Combining Persuasive Strategies (Gazing and Gestures) by a Storytelling Robot on Its Persuasive Power. - Jaap Ham; René Bokhorst; Raymond H. Cuijpers; David van der Pol; John-John Cabibihan (ICSR, 2011)

User Models for Motivational Systems - The Affective and the Rational Routes to Persuasion. - Floriana Grasso; Jaap Ham; Judith Masthoff (UMAP Workshops, 2011)

When Artificial Social Agents Try to Persuade People: The Role of Social Agency on the Occurrence of Psychological Reactance. - Maike A. J. Roubroeks; Jaap Ham; Cees J. H. Midden (Int. J. Soc. Robotics, 2011)

The Illusion of Agency: The Influence of the Agency of an Artificial Agent on Its Persuasive Power. - Cees J. H. Midden; Jaap Ham (PERSUASIVE, 2012)

The Automaticity of Social Behavior towards Robots: The Influence of Cognitive Load on Interpersonal Distance to Approachable versus Less Approachable Robots. - Jaap Ham; Mirjam van Esch; Yvonne Limpens; Jente de Pee; John-John Cabibihan; Shuzhi Sam Ge (ICSR, 2012)

How to Make a Robot Smile? Perception of Emotional Expressions from Digitally-Extracted Facial Landmark Configurations. - Caixia Liu; Jaap Ham; Eric O. Postma; Cees J. H. Midden; Bart Joosten; Martijn Goudbeek (ICSR, 2012)

Trust in Smart Systems: Sharing Driving Goals and Giving Information to Increase Trustworthiness and Acceptability of Smart Systems in Cars. - Frank M. F. Verberne; Jaap Ham; Cees J. H. Midden (Hum. Factors, 2012)

Goal inferences about robot behavior: goal inferences and human response behaviors. - Hedwig Anna Theresia Broers; Jaap Ham; Ron Broeders; P. Ravindra De Silva; Michio Okada (HRI, 2013)

I Didn't Know That Virtual Agent Was Angry at Me: Investigating Effects of Gaze Direction on Emotion Recognition and Evaluation. - Peter A. M. Ruijten; Cees J. H. Midden; Jaap Ham (PERSUASIVE, 2013)

Trusting Digital Chameleons: The Effect of Mimicry by a Virtual Social Agent on User Trust. - Frank M. F. Verberne; Jaap Ham; Aditya Ponnada; Cees J. H. Midden (PERSUASIVE, 2013)

Towards culture-specific robot customisation: A study on greeting interaction with Egyptians. - Gabriele Trovato; Massimiliano Zecca; Salvatore Sessa 001; Lorenzo Jamone; Jaap Ham; Kenji Hashimoto; Atsuo Takanishi (RO-MAN, 2013)

The Car that Looks Like Me: Similarity Cues can Increase Trust in the Self-Driving Cars of the Future. - Frank M. F. Verberne; Jaap Ham; Cees J. H. Midden (ERCIM News, 2013)

Robots Sing the Body Electric: Investigations of Body Language for Social and Spatial Interaction. - Jaap Ham; Vanessa Evers; Manja Lohse (Int. J. Soc. Robotics, 2013)

Representing Affective Facial Expressions for Robots and Embodied Conversational Agents by Facial Landmarks. - Caixia Liu; Jaap Ham; Eric O. Postma; Cees J. H. Midden; Bart Joosten; Martijn Goudbeek (Int. J. Soc. Robotics, 2013)

Cross-cultural study on human-robot greeting interaction: acceptance and discomfort by Egyptians and Japanese. - Gabriele Trovato; Massimiliano Zecca; Salvatore Sessa 001; Lorenzo Jamone; Jaap Ham; Kenji Hashimoto; Atsuo Takanishi (Paladyn J. Behav. Robotics, 2013)

The Power of Negative Feedback from an Artificial Agent to Promote Energy Saving Behavior. - Cees J. H. Midden; Jaap R. C. Ham (HCI (11), 2014)

Introducing a rasch-type anthropomorphism scale. - Peter A. M. Ruijten; Diane H. L. Bouten; Dana C. J. Rouschop; Jaap Ham; Cees J. H. Midden (HRI, 2014)

Using Ambient Lighting in Persuasive Communication: The Role of Pre-existing Color Associations. - Shengnan Lu; Jaap Ham; Cees J. H. Midden (PERSUASIVE, 2014)

Investigating the Influence of Social Exclusion on Persuasion by a Virtual Agent. - Peter A. M. Ruijten; Jaap Ham; Cees J. H. Midden (PERSUASIVE, 2014)

A Persuasive Robot to Stimulate Energy Conservation: The Influence of Positive and Negative Social Feedback and Task Similarity on Energy-Consumption Behavior. - Jaap Ham; Cees J. H. Midden (Int. J. Soc. Robotics, 2014)

Preface to the special issue on personalization and behavior change. - Judith Masthoff; Floriana Grasso; Jaap Ham (User Model. User Adapt. Interact., 2014)

Does Trigger Location Matter? The Influence of Localization and Motivation on the Persuasiveness of Mobile Purchase Recommendations. - Frank Basten; Jaap Ham; Cees J. H. Midden; Luciano Gamberini; Anna Spagnolli (PERSUASIVE, 2015)

Persuasive Technology Based on Bodily Comfort Experiences: The Effect of Color Temperature of Room Lighting on User Motivation to Change Room Temperature. - Shengnan Lu; Jaap Ham; Cees J. H. Midden (PERSUASIVE, 2015)

Conforming to an Artificial Majority: Persuasive Effects of a Group of Artificial Agents. - Cees J. H. Midden; Jaap Ham; Joey Baten (PERSUASIVE, 2015)

Study on Adaptation of Robot Communication Strategies in Changing Situations. - Gabriele Trovato; J. Galeazzi; Elena Torta; Jaap R. C. Ham; Raymond H. Cuijpers (ICSR, 2015)

Investigating the Effect of Relative Cultural Distance on the Acceptance of Robots. - Gabriele Trovato; Jaap R. C. Ham; Kenji Hashimoto; Hiroyuki Ishii; Atsuo Takanishi (ICSR, 2015)

Trusting a Virtual Driver That Looks, Acts, and Thinks Like You. - Frank M. F. Verberne; Jaap Ham; Cees J. H. Midden (Hum. Factors, 2015)

Lonely and Susceptible: The Influence of Social Exclusion and Gender on Persuasion by an Artificial Agent. - Peter A. M. Ruijten; Cees J. H. Midden; Jaap Ham (Int. J. Hum. Comput. Interact., 2015)

Combining Robotic Persuasive Strategies: The Persuasive Power of a Storytelling Robot that Uses Gazing and Gestures. - Jaap Ham; Raymond H. Cuijpers; John-John Cabibihan (Int. J. Soc. Robotics, 2015)

Shall I Show You Some Other Shirts Too? The Psychology and Ethics of Persuasive Robots. - Jaap Ham; Andreas Spahn (A Construction Manual for Robots' Ethical Systems, 2015)

Red Radiators Versus Red Tulips: The Influence of Context on the Interpretation and Effectiveness of Color-Based Ambient Persuasive Technology. - Shengnan Lu; Jaap Ham; Cees J. H. Midden (PERSUASIVE, 2016)

Investigating the Differences in Effects of the Persuasive Message's Timing During Science Learning to Overcome the Cognitive Dissonance. - Youssef Khaoula; Jaap Ham; Michio Okada (ICSR, 2016)

Investigating the Effects of the Persuasive Source's Social Agency Level and the Student's Profile to Overcome the Cognitive Dissonance. - Youssef Khaoula; Jaap Ham; Michio Okada (ICSR, 2016)

Finding Kairos: The Influence of Context-Based Timing on Compliance with Well-Being Triggers. - Jaap Ham; Jef van Schendel; Saskia Koldijk; Evangelia Demerouti (Symbiotic, 2016)

Ambiguous Agents: The Influence of Consistency of an Artificial Agent's Social Cues on Emotion Recognition, Recall, and Persuasiveness. - Peter A. M. Ruijten; Cees J. H. Midden; Jaap Ham (Int. J. Hum. Comput. Interact., 2016)

The Influence of Social Cues and Controlling Language on Agent's Expertise, Sociability, and Trustworthiness. - Aimi Shazwani Ghazali; Jaap Ham; Emilia I. Barakova; Panos Markopoulos 001 (HRI (Companion), 2017)

Using Tailoring to Increase the Effectiveness of a Persuasive Game-Based Training for Novel Technologies. - Sofia Fountoukidou; Jaap Ham; Cees J. H. Midden; Uwe Matzat (PPT@PERSUASIVE, 2017)

Pardon the rude robot: Social cues diminish reactance to high controlling language. - Aimi Shazwani Ghazali; Jaap Ham; Emilia I. Barakova; Panos Markopoulos 001 (RO-MAN, 2017)

Persuasive Virtual Touch: The Effect of Artificial Social Touch on Shopping Behavior in Virtual Reality. - Yuguang Zhao; Jaap Ham; Jurgen van der Vlist (Symbiotic, 2017)

Special issue on supporting a healthier lifestyle with e-coaching systems. - Robbert-Jan Beun; Joel Anderson; Jaap Ham; Michel C. A. Klein; Anne Roefs; Joyce Westerink (Pers. Ubiquitous Comput., 2017)

Using an Artificial Agent as a Behavior Model to Promote Assistive Technology Acceptance. - Sofia Fountoukidou; Jaap Ham; Uwe Matzat; Cees J. H. Midden (PERSUASIVE, 2018)

Cardiovascular Reactions During Exposure to Persuasion Principles. - Hanne Spelt; Joyce Westerink; Jaap Ham; Wijnand A. IJsselsteijn (PERSUASIVE, 2018)

Poker Face Influence: Persuasive Robot with Minimal Social Cues Triggers Less Psychological Reactance. - Aimi Shazwani Ghazali; Jaap Ham; Emilia I. Barakova; Panos Markopoulos 001 (RO-MAN, 2018)

The influence of social cues in persuasive social robots on psychological reactance and compliance. - Aimi Shazwani Ghazali; Jaap Ham; Emilia I. Barakova; Panos Markopoulos 001 (Comput. Hum. Behav., 2018)

Effects of Robot Facial Characteristics and Gender in Persuasive Human-Robot Interaction. - Aimi Shazwani Ghazali; Jaap Ham; Emilia I. Barakova; Panos Markopoulos 001 (Frontiers Robotics AI, 2018)

Investigating the Effect of Social Cues on Social Agency Judgement. - Aimi Shazwani Ghazali; Jaap Ham; Panos Markopoulos 001; Emilia I. Barakova (HRI, 2019)

Effects of a Virtual Model's Pitch and Speech Rate on Affective and Cognitive Learning. - Sofia Fountoukidou; Uwe Matzat; Jaap Ham; Cees J. H. Midden (PERSUASIVE, 2019)

Assessing the effect of persuasive robots interactive social cues on users' psychological reactance, liking, trusting beliefs and compliance. - Aimi Shazwani Ghazali; Jaap Ham; Emilia I. Barakova; Panos Markopoulos 001 (Adv. Robotics, 2019)

Effects of an artificial agent as a behavioral model on motivational and learning outcomes. - Sofia Fountoukidou; Jaap Ham; Uwe Matzat; Cees J. H. Midden (Comput. Hum. Behav., 2019)

Perceived Human-Likeness of Social Robots: Testing the Rasch Model as a Method for Measuring Anthropomorphism. - Peter A. M. Ruijten; Antal Haans; Jaap Ham; Cees J. H. Midden (Int. J. Soc. Robotics, 2019)

Psychophysiological Measures of Reactance to Persuasive Messages Advocating Limited Meat Consumption. - Hanne Spelt; Elisabeth Kersten-van Dijk; Jaap Ham; Joyce Westerink; Wijnand A. IJsselsteijn (Inf., 2019)

Robot Role Design for Implementing Social Facilitation Theory in Musical Instruments Practicing. - Heqiu Song; Zhiping Zhang; Emilia I. Barakova; Jaap Ham; Panos Markopoulos 001 (HRI, 2020)

Learning to Stop Smoking: Understanding Persuasive Applications' Long-Term Behavior Change Effectiveness Through User Achievement Motivation. - Jaap Ham; Sitwat Usman Langrial (PERSUASIVE, 2020)

Mobile-based Text Messages for Improved Pediatric Health in Rural Areas of Pakistan: A Qualitative Study. - Sitwat Usman Langrial; Jaap Ham (PERSUASIVE, 2020)

Personalizing Persuasive Technologies Workshop 2020. - Rita Orji; Jaap Ham; Kiemute Oyibo; Joshua C. Nwokeji; Oladapo Oyebode (PERSUASIVE (Adjunct), 2020)

Persuasive Robots Acceptance Model (PRAM): Roles of Social Responses Within the Acceptance Model of Persuasive Robots. - Aimi Shazwani Ghazali; Jaap Ham; Emilia I. Barakova; Panos Markopoulos 001 (Int. J. Soc. Robotics, 2020)

Towards Human-Centered Design of Workplace Health Stimulation Interventions: Investigation of Factors Contributing to Office Workers' Exercise Behavior. - Tianmei Zhang; Jaap Ham (IHIET (Strasbourg), 2021)

Investigating User Perceptions of Persuasive Design Elements that Influence Perceived Credibility. - Felix Nti Koranteng; Jaap Ham; Isaac Wiafe (PERSUASIVE, 2021)

Making Them Use It: User Perceptions that Determine the Acceptance of a Persuasive Interventions for Child Healthcare. - Sitwat Langrial; Jaap Ham; Fannah Al-Fannah Al Araimi (PERSUASIVE, 2021)

Adaptive and Personalized Persuasive Technologies. - Kiemute Oyibo; Ifeoma Adaji; Rita Orji; Jaap Ham; Julita Vassileva (UMAP (Adjunct Publication), 2021)

Personalizing HRI in Musical Instrument Practicing: The Influence of Robot Roles (Evaluative Versus Nonevaluative) on the Child's Motivation for Children in Different Learning Stages. - Heqiu Song; Emilia I. Barakova; Panos Markopoulos 001; Jaap Ham (Frontiers Robotics AI, 2021)

Preface to the 6th International Workshop on Personalizing Persuasive Technologies. - Ifeoma Adaji; Kiemute Oyibo; Rita Orji; Jaap Ham; Oladapo Oyebode (PERSUASIVE (Adjunct), 2022)

Supporting to be Credible: Investigating Perceived Social Support as a Determinant of Perceived Credibility. - Felix Nti Koranteng; Jaap Ham; Uwe Matzat; Isaac Wiafe (PERSUASIVE, 2022)

Learning Musical Instrument with the Help of Social Robots: Attitudes and Expectations of Teachers and Parents. - Heqiu Song; Maria Deetman; Panos Markopoulos 001; Jaap Ham; Emilia I. Barakova (RO-MAN, 2022)

The role of usability, aesthetics, usefulness and primary task support in predicting the perceived credibility of academic social networking sites. - Felix Nti Koranteng; Jaap Ham; Isaac Wiafe; Uwe Matzat (Behav. Inf. Technol., 2022)

The effect of an artificial agent's vocal expressiveness on immediacy and learning. - Sofia Fountoukidou; Uwe Matzat; Jaap Ham; Cees J. H. Midden (J. Comput. Assist. Learn., 2022)

Psychophysiological Reactions to Persuasive Messages Deploying Persuasion Principles. - Hanne Spelt; Joyce H. D. M. Westerink; Jaap Ham; Wijnand A. IJsselsteijn (IEEE Trans. Affect. Comput., 2022)

Persuasion-Induced Physiology as Predictor of Persuasion Effectiveness. - Hanne A. A. Spelt; Chao Zhang 071; Joyce H. D. M. Westerink; Jaap Ham; Wijnand A. IJsselsteijn (IEEE Trans. Affect. Comput., 2022)

Physiology-based personalization of persuasive technology: a user modeling perspective. - Hanne A. A. Spelt; Joyce H. D. M. Westerink; Lily Frank; Jaap Ham; Wijnand A. IJsselsteijn (User Model. User Adapt. Interact., 2022)

Design and Evaluation of a Persuasive Road Marking System for Controlling Speeding Behavior. - Isaac Wiafe; Elikem Doe Atsakpo; Charles Nutrokpor; Jaap Ham; Stephen R. Gulliver (MindTrek, 2023)

"I Know What They Are Trying...!" - The Influence of Awareness of Persuasive Strategy Usage on Phishing Email Recognition Accuracy. - Asal Hojjati; Jaap Ham (PERSUASIVE (Adjunct), 2023)

Credibility in Persuasive Systems: A Systematic Review. - Felix Nti Koranteng; Uwe Matzat; Isaac Wiafe; Jaap Ham (PERSUASIVE, 2023)

How Social Robots can Influence Motivation as Motivators in Learning: A Scoping Review. - Heqiu Song; Shiyuan Huang; Emilia I. Barakova; Jaap Ham; Panos Markopoulos 001 (PETRA, 2023)

Adaptive and Personalized Persuasive Technologies (ADAPPT 2023) Workshop. - Kiemute Oyibo; Ifeoma Adaji; Rita Orji; Jaap Ham; Julita Vassileva (UMAP (Adjunct Publication), 2023)

Effects of robot gaze and voice human-likeness on users' subjective perception, visual attention, and cerebral activity in voice conversations. - Mingming Li; Fu Guo; Xueshuang Wang; Jiahao Chen; Jaap Ham (Comput. Hum. Behav., 2023)

Preface to the 7th International Workshop on Personalizing Persuasive Technologies. - Ifeoma Adaji; Kiemute Oyibo; Rita Orji; Jaap Ham; Alaa Alslaity (PERSUASIVE (Adjunct), 2024)

A serious game for promoting sustainable food choices. - Peter A. M. Ruijten; Jaap Ham; Nienke de Jongh (PERSUASIVE (Adjunct), 2024)

How the Role of a Persuasive Robot Impacts One's Attitude Towards It. - Peter A. M. Ruijten; Jin Smeding; Jaap Ham (PERSUASIVE, 2024)

Can Robots Enhance the Learning Experience by Making Music More Fun? - Gabriella Tisza; Heqiu Song; Panos Markopoulos 001; Emilia I. Barakova; Jaap Ham (RO-MAN, 2024)

Different dimensions of anthropomorphic design cues: How visual appearance and conversational style influence users' information disclosure tendency towards chatbots. - Jiahao Chen; Mingming Li; Jaap Ham (Int. J. Hum. Comput. Stud., 2024)

'How Would you Score Yourself?': The Effect of Self-assessment Strategy Through Robots on Children's Motivation and Performance in Piano Practice. - Heqiu Song; Konstantinos Tsiakas; Jaap Ham; Panos Markopoulos 001; Emilia I. Barakova (Int. J. Soc. Robotics, 2024)

The impact of social robots' presence and roles on children's performance in musical instrument practice. - Heqiu Song; Emilia I. Barakova; Jaap Ham; Panos Markopoulos 001 (Br. J. Educ. Technol., 2024)

Effects of Anthropomorphic Design Cues of Chatbots on Users' Perception and Visual Behaviors. - Jiahao Chen; Fu Guo; Zenggen Ren; Mingming Li; Jaap Ham (Int. J. Hum. Comput. Interact., 2024)

Investigating the Effects of Implicit and Explicit Personalization on Perceived Credibility. - Felix Nti Koranteng; Isaac Wiafe; Jaap Ham; Uwe Matzat (BCSS, 2025)

Social Robots as Decision-Making Companions: Exploring the Impact of Social Cues on Human Responses. - Aimi Shazwani Ghazali; Hariz Hafizalshah; Shahrul Naim Sidek; Hazlina Md Yusof; Jaap Ham (Int. J. Humanoid Robotics, 2025)

Editorial introduction. - Alexander Meschtscherjakov; Cees J. H. Midden; Jaap Ham (Behav. Inf. Technol., 2025)

Audiovisual Affective Design of Humanoid Robot Appearance and Voice Based on Kansei Engineering. - Mingming Li; Jia Zhang; Fu Guo; Yanyan Liao; Xiaolei Hu; Jaap Ham (Int. J. Soc. Robotics, 2025)

Human-chatbot interaction studies through the lens of bibliometric analysis. - Jiahao Chen; Fu Guo; Zenggen Ren; Xueshuang Wang; Jaap Ham (Univers. Access Inf. Soc., 2025)