Fig. 1

Timeline of the present research procedure. Green arrows indicate the introduction of Resyone for each resident (ID1, ID2 and ID3). The blue circles indicate the start points for the care record survey, the survey of facial expressions of the residents, and questionnaires for the caregivers. The red circle indicates the start point for implementing the proposed additional care operations. Black circles indicate when the pre-survey and post-survey interviews took place. Phases 1, 2 and 3 were set at two weeks each, with Phase 1 being prior to the introduction of additional care operations and Phases 2 and 3 being after their introduction