記憶功能與人們的生活密切相關，但隨著年紀漸增，記憶功能面臨著衰退的問題，而當記憶功能明顯下降時，可能會使老人對於自我的存在及認同產生錯亂，以致於引發情緒不佳及精神心理方面的障礙，為避免年長者遭遇這些問題，必須幫助他們延緩記憶力衰退。

而在眾多訓練記憶功能的介入方法裡，懷舊活動是近期被護理人員、職能治療師廣泛運用的方式，因為大多數長者都喜歡回憶過往經驗，並且有許多文獻證明其效果，包括能夠有效減緩年長者記憶力衰退、改善其憂鬱情緒、提升老人的自信心以及社交能力等，許多社區中心、安養院、醫院都會替年長者進行懷舊活動。

然而，雖然懷舊活動有許多益處，但在實際實施的時候仍然有許多限制，傳統懷舊活動藉著活動主持人規劃懷舊主題，並提供適當的引導物，像是照片、音樂、食物、書籍等等，來刺激年長者回憶，不過並不是所有主題都有適合的引導物，像是時代太久遠的或是不易保存的及過去的整體景觀都不容易有相對應的引導物，若沒有引導物之時就必須仰賴主持人的技巧，以口語的方式來喚醒長者們的記憶。

因此本研究目標藉由現代發展日益成熟的虛擬實境的技術開發一套懷舊虛擬實境模擬系統，建構傳統懷舊活動沒辦法呈現的完整懷舊場景，並且藉由虛擬實境的兩個特性：沈浸性及互動性，讓年長者不僅能夠沈浸在擬真的3D模擬懷舊環境當中，還可以透過手勢感測器以直覺的方式與系統中的懷舊物件進行互動，使長者彷彿置身在當時的時空背景之中，藉此提取過去的長期記憶，並透過分享這些回憶接受自我並減緩記憶力衰退。

Memory functions are closely related to people’s lives, and yet, as people age, they face degeneration of memory functions. When memory functions deteriorate significantly, not only does it affect daily life functions, it may also cause self-identity confusion in the elderly and, subsequently, depressed moods or psychological disorders. In order to avoid these problems, we must help stimulate their memories to delay memory loss.
Among the various intervention methods for memory function training, reminiscence activities are the most widely practiced by care workers and occupational therapists because most elderly people already enjoy reminiscing the past. Moreover, there is much literature in support of their effects, including delaying memory loss, improving depression, raising confidence, and enhancing socializing skills. Many community centers, nursing homes, and hospitals all host reminiscence activities for their elderly.
Nevertheless, despite the many benefits of reminiscence activities, in practice, there are still certain limitations. Traditional reminiscence activities rely on hosts to design the theme and provide appropriate guiding objects, such as photos, music, food, or books to stimulate the elderly’s long-term memory. However, not all themes can find corresponding objects; for instance, guiding objects for an era too long ago, objects that are hard to preserve, or overall past sceneries are all hard to come by. When there is no guiding object, the activity relies on the host’s skills to use oral approaches to bring back the elderly’s memories; in such instances, the effect of reminiscence activities might be compromised.
Therefore, this study’s goal is to develop a reminiscence virtual reality system by use of modern day’s maturing virtual reality techniques. The aim is to present complete reminiscence sceneries that traditional reminiscence activities cannot achieve and utilize the two characteristics of virtual reality – immersion and sense of interaction – to allow the elderly to not only immerse in the simulated 3D reminiscence scenery, but also make use of gesture sensors to interact with reminiscence objects from the system in an instinctive manner, so that the elderly may feel as if being placed under the time and space from old days and retrieve long-term memories. By sharing such memories, it is the hope that the elderly will accept themselves and their memory loss can be delayed.

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