Kohki Kaji

About Me

Kohki Kaji | 鍛治 岬輝
Ph.D student
Email: k_kaji[at]p.u-tokyo.ac.jp

The University of Tokyo
Stress, Bio-marker & Life-course Health Lab.　
Supervisor: Ryu Takizawa

I am a Ph.D student at the University of Tokyo, majoring in clinical psychology. In my master’s thesis, I conducted a randomized controlled trial to examine how the mindfulness-based intervention delivered through a smartphone application can improve mental health risk factors. I am currently working on digital psychotherapy using artifical intelligent to support adults and adolescents with autistic traits.

Keywords: clinical psychology, digital mental health, ai-assisted care, autistic traits, perspective-taking

Peer-reviewed journal articles

First Author

  1. Coming Soon…

Co-author

  1. Uwagawa, R., Adachi, K., Kaji, K., Takizawa, R. (in press). Impact of an eight-week app-based mindfulness intervention on subjective and objective sleep quality: A randomized controlled trial among working women, BMC Digit Health

Conference Presentations

First Author
  1. Kaji, K., Adachi, K., Aoshima, R., Sugie, M., & Takizawa, R. (2025). The mindfulness-based intervention on a smartphone app can reduce the personal distress for healthy workers with autistic traits: an RCT study. 55th Annual Congress of the European Association for Behavioural and Cognitive Therapies, Glasgow, Britain. (poster)
  2. Kaji, K., Uwagawa, R., Adachi, K., Sugie, M., Kimura, Y., Shimoda, M., & Takizawa, R. (2024). Decreased oxygen saturation during sleep in an 8-week app-based mindfulness intervention: A smart-watch randomized controlled trial. 54th Annual Congress of the European Association for Behavioural and Cognitive Therapies, Belgrade, Serbia. (poster)
  3. Kaji, K., Adachi, K., Uwagawa, R., Shimoda, M., Sugie, M., Kimura, Y., & Takizawa, R. (2024). App-based mindfulness reduced perceived stress: moderation effect of cognitive emotion regulation. 33rd International Congress of Psychology, Prague, Czech Republic. (poster)
  4. Kaji, K., Adachi, K., & Takizawa, R. (2024). The promoting effect of a 12-week online mindfulness intervention on self-esteem: A randomized controlled trial. 8th Asian CBT Congress, New Delhi, India. (poster)
Co-author
  1. Aoshima, R., Adachi, K., Kaji, K., Sugie, M., Ito, R., Jitoe, Y., Kurosawa, T., & Takizawa, R. (2025). Mindfulness-based interventions using smartphone application to improve self-perceived creativity in working women: a randomized controlled trial. 2025 APA Annual Meeting, Los Angeles, CA, United States. (poster)
  2. Adachi, K. Kaji, K., Aoshima, R., Sugie, M. & Takizawa, R. (2025). Relationship between well-being and PFC function by mindfulness meditation: a cross-over RCT study. 2025 American Psychological Association (APA) convention, Denver, CO, United States. (poster)
  3. Aoshima, R., Uwagawa, R., Adachi, K., Ito, R., Kaji, K., Kimura, Y., Sugie, M., Shimoda, M., Kurosawa, T., & Takizawa, R. (2024). Mindfulness-based interventions using smartphone application to improve life satisfaction in working women: a randomized controlled trial. 24th World Congress of Psychiatry, Mexico City, Mexico. (poster)
  4. Ito, R., Uwagawa, R., Adachi, K., Aoshima, R., Kaji, K., Kimura, Y., Sugie, M., Shimoda, M., Hibi, M., Yanagi, N., & Takizawa, R. (2024). Moderation Effect of Adverse Childhood Experiences (ACEs) on App-based Mindfulness Meditation Intervention in Adult Working Women: A Randomized Controlled Trial. 24th World Congress of Psychiatry, Mexico City, Mexico. (poster)
  5. Uwagawa, R., Adachi, K., Shimoda, M., Sugie, M., Kaji, K., Kimura, Y., Kurosawa, T., & Takizawa, R. (2024). Effects of the 8-week app-based mindfulness interventions on trait anger in working women: A randomized controlled trial. 54th Annual Congress of the European Association for Behavioural and Cognitive Therapies, Belgrade, Serbia. (poster)
  6. Sugie, M., Uwagawa, R., Adachi, K., Shimoda, M., Kaji, K., Kimura, Y., Kurosawa, T., & Takizawa, R. (2024). Low-intensity mindfulness-based smartphone interventions to improve self-compassion in working women: a randomized controlled trial. 54th Annual Congress of the European Association for Behavioural and Cognitive Therapies, Belgrade, Serbia. (poster)
  7. Adachi, K., Kaji, K., & Takizawa, R. (2024). Relationship between self-esteem and PFC function by mindfulness meditation: a cross-over RCT study. 33rd International Congress of Psychology, Prague, Czech Republic. (poster)
  8. Uwagawa, R. Adachi, K., Shimoda, M., Sugie, M., Kaji, K., Kimura, Y., & Takizawa, R.(2024). Meditation intervention using the smartphone app to improve mental health and stress in working women. 33rd International Congress of Psychology, Prague, Czech Republic. (poster)

Grants / Awards

  1. JST SPRING, Grant Number JPMJSP2108
  2. 2024年度若手研究者育成プロジェクト（Research funds acquired 280,000 yen）