PhD Candidate in Health Informatics at the University of Michigan School of Information
I am currently a Ph.D. candidate studying health informatics at the School of Information, University of Michigan. Co-advised by Dr. Mark W. Newman and Dr. Pedja Klasnja, I study how mobile health (mHealth) technologies can help people build a healthy and positive relationship with health behaviors for sustainable behavior change.
I study how mobile health (mHealth) technologies can support people in building healthy and sustainable relationships with behaviors like physical activity, especially among middle-aged and older adults. By integrating insights from behavioral psychology with human-centered design, my work aims to understand the underlying mechanisms that drive lasting change, such as intrinsic motivation, and create interventions that are both effective and adaptive to users' dynamic and personal needs. My goal is to bridge the fields of HCI and behavioral medicine, designing solutions that empower individuals to make lasting, meaningful changes in their everyday lives.
Human-centered Design (HCD), User Experience (UX), Long-term Behavior Change, Physical Activity, Intrinsic Motivation, Affective associations and Beliefs, Identity and Values, Personalized and Adaptive Interventions
mobile Health (mHealth), Human-computer Interaction (HCI), Behavioral Science and Psychology, Personal Health Informatics, Preventive Medicine, Digital Therapeutics (DTx)
Needs Assessments and Interviews, Participatory Designs and Co-designs, Randomized Controlled Trials (RCTs), Factorial Designs, Just-in-time Adaptive Interventions (JITAIs), Micro-randomized Trials (MRT)
Choi, S. J. S., Hung, P. Y., Liu, M., Dempsey, W., Newman, M. W., & Klasnja, P. (2025). Improving Affective Associations With Physical Activity via a Message-Based mHealth Intervention (WalkToJoy): Proof-of-Concept Study. Journal of Medical Internet Research, 27, e75792.
Choi, S. J. (2022). Improving affective valuations of physical activity with mobile technology: A protocol for a hybrid factorial/micro-randomized trial. Deep Blue. https://dx.doi.org/10.7302/5862
Robles, M. C., Newman, M. W., Doshi, A., Bailey, S., Huang, L., Choi, S. J., ... & Skolarus, L. E. (2022). A Physical Activity Just-in-time Adaptive Intervention Designed in Partnership With a Predominantly Black Community: Virtual, Community-Based Participatory Design Approach. JMIR Formative Research, 6(3), e33087.
Park, S., Kim, L., Kwon, J., Choi S. J., & Whang M. (2021). Evaluation of visual-induced motion sickness from head-mounted display using heartbeat evoked potential: a cognitive load-focused approach. Virtual Reality. https://doi.org/10.1007/s10055-021-00600-8
Park, S. I., Whang, M. C., Choi, S. J., Lee, D. W., & Mun, S. C. (2021). U.S. Patent Application No. 16/906,791.
Park, S., Choi, S. J., Mun, S., & Whang, M. (2019). Measurement of emotional contagion using synchronization of heart rhythm pattern between two persons: Application to sales managers and sales force synchronization. Physiology & behavior, 200, 148-158. https://doi.org/10.1016/j.physbeh.2018.04.022
Choi, S. J., Lee, S., & Won, M. (2019). Development of 'LightMeCup' prototypes using entry-level 3D printers. HCI Korea 2019 Conference of the HCI Society of Korea (pp. 932-937).