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JRM Vol.35 No.3 pp. 788-798
doi: 10.20965/jrm.2023.p0788
(2023)

Paper:

Estimation Model for Emotions Based on Pulse

Jiro Morimoto*1 ORCID Icon, Akihiro Murakawa*2, Hiroki Fujita*2, Makoto Horio*3, Junji Kawata*1 ORCID Icon, Yoshio Kaji*4 ORCID Icon, Mineo Higuchi*1 ORCID Icon, and Shoichiro Fujisawa*1 ORCID Icon

*1Faculty of Science and Engineering, Tokushima Bunri University
1314-1 Shido, Sanuki, Kagawa 769-2193, Japan

*2Graduate School of Engineering, Tokushima Bunri University
1314-1 Shido, Sanuki, Kagawa 769-2193, Japan

*3Art and Information Research Institute
1968 Hara, Mure, Takamatsu, Kagawa 761-0123, Japan

*4Faculty of Human Life Sciences, Tokushima Bunri University
180 Nishihama-Boji, Yamashiro-cho, Tokushima 770-8514, Japan

Received:
November 28, 2022
Accepted:
April 17, 2023
Published:
June 20, 2023
Keywords:
estimation, emotion, pulse, APG, transfer function
Abstract

The progressive aging of society has increased expectations for the spread of nursing care robots to support long-term care and welfare services. This research had the goal of developing a communication system as one of the elemental technologies of nursing care robots, along with a method that allows care robots to consider a user’s emotions. The estimation of emotions based on a user’s electroencephalogram and heartbeat has attracted attention. However, users may experience stress when wearing the sensors needed for such measurements. To prevent this system from causing stress in users, we had the goal of developing an estimation model for emotions based on the pulse, which is relatively easy to measure. Various autonomic nervous activity indices (pNN50, RMSSD, LF, HF, LF/HF) were adopted for the estimation model, and transfer functions were established. These indices were considered in time domain and frequency domain analyses of the heart rate variability. The pulse was measured while the user was watching a video and converted into an accelerated plethysmogram using second order differentiation. Then, the autonomic nervous activity indices were calculated. The transfer function from the input to output was identified using these autonomic nervous activity indices as inputs and the responses to a questionnaire that was administered after watching the video as outputs.

Construction of emotion estimation model

Construction of emotion estimation model

Cite this article as:
J. Morimoto, A. Murakawa, H. Fujita, M. Horio, J. Kawata, Y. Kaji, M. Higuchi, and S. Fujisawa, “Estimation Model for Emotions Based on Pulse,” J. Robot. Mechatron., Vol.35 No.3, pp. 788-798, 2023.
Data files:
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