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"Like Having Family Nearby": An LLM-Powered Family-Resembling Avatar for offering Psychological Support and Training Guidance during Stroke Rehabilitation
Peixuan Xiong
Computational Media and Arts Thrust
The Hong Kong University of Science
and Technology (Guangzhou)
Guangzhou, China
pxiong843@connect.hkust-gz.edu.cn
Zhenyu Wang
Intelligent Transportation Thrust
The Hong Kong University of Science
and Technology (Guangzhou)
Guangzhou, China
zwang209@connect.hkust-gz.edu.cn
Kaishun
Wu
Hong Kong University of Science and
Technology (Guangzhou)
Guangzhou, China
wuks@hkust-gz.edu.cn
Yuling Wang∗
Bingchen Guo
The Hong Kong University of Science
and Technology (Guangzhou)
Guangzhou, China
ucabbg1@ucl.ac.uk
Xian Li
School of Design
Southern University of Science and
Technology
Shenzhen, Guangdong, China
12011010@mail.sustech.edu.cn
Xian Li
School of Design
Southern University of Science and
Technology
Shenzhen, Guangdong, China
12011010@mail.sustech.edu.cn
Xian Li
The Sixth Affiliated Hospital, Sun
Yat-sen University
Guangzhou, China
sophielixian@163.com
Chao Liu
The Hong Kong University of Science
and Technology (Guangzhou)
Guangzhou, China
cliu009@connect.hkust-gz.edu.cn
Nianci Zhao
The Chinese University of Hongkong,
Shenzhen
Shenzhen, Guangdong, China
niancizhao@link.cuhk.edu.cn
Chen Gong
The Sixth Affiliated Hospital, Sun
Yat-sen University
Sun Yat-sen University
Guangzhou, Guangdong, China
gongch33@mail.sysu.edu.cn
The Hong Kong University of Science
The Sixth Affiliated Hospital, Sun
Yat-sen University
Guangzhou, China
Yuling Wang∗
Bingchen Guo
The Hong Kong University of Science
and Technology (Guangzhou)
Guangzhou, China
ucabbg1@ucl.ac.uk
wangyul@mail.sysu.edu.cn
and Technology (Guangzhou)
Guangzhou, China
The Hong Kong University of Science
and Technology
Hong Kong, China
Mingming Fan∗
Department of Rehabilitation
Medicine
and Technology (Guangzhou)
Guangzhou, China
The Hong Kong University of Science
and Technology
Hong Kong, China
mingmingfan@ust.hk
Figure 1: Personalized companion–coach system: (A) Avatar enrollment. Assembling a family-member avatar by reconstructing
head avatars from a single photo and voice cloning from voice recording. (B)Runtime. The patient converses with the avatar.
The avatar uses Gemini for dialogue and uses Qwen3-VL for action understanding. The avatar can simultaneously serve as a
conversational companion and provide rehabilitation training guidance.
Abstract
Stroke rehabilitation is prolonged and emotionally demanding,
yet family members cannot provide continuous companionship
or coaching. We explore a family-resembling avatar that offers psy
chological support and training guidance when relatives cannot
be present. We conducted an empirical user study with six stroke
patients and their family members (N=12). Our qualitative find
ings suggest such companions may reduce loneliness and increase
perceived warmth, while action-relevant guidance can comple
mentcaregivers’ limited rehabilitation knowledge. Participants also
raised concerns about emotional dependence, privacy, and the need
for stronger clinical alignment to avoid inappropriate guidance. We
discuss implications for designing family-resembling companion
coach avatars with clear boundaries, privacy-preserving personal
ization, and supervised deployment in rehabilitation workflows.
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