This paper describes a new concept system for physical and mental activation of the elderly which is designed to emphasize the factors of interaction and amusement in virtual reality(VR). It presents 3D visuals, sounds, and a vibration feedback and detects the user's movement A 60-inch display, two liquid crystal projectors with polarizing filters and polarizing glasses are used to produce 3D images. A pair of virtual maracas with a speaker, a vibrator and a LED marker for detecting 3D position was developed for interaction. After some improvement and assessment the developed system was introduced to the group recreation program for the elderly in day-nursing services. Two kinds of VR games, that is a balloon smashing and a mole hitting were applied for a week to 38 and 49 persons respectively. Operation of the adjustment in difficulty was successful and almost all participants, both with and without dementia symptoms were able to enjoy VR games. The effects of mental and physical activation were observed in movements, facial expressions, and verbal responses.
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