## 3 Practical Applications of VR in CR
### Individual Immersive Systems  
Individual immersive rehabilitation is a system that uses virtual reality technology to provide a personalized, immersive cognitive rehabilitation training environment for a single patient. Its highly immersive environment can be customized to individual needs, allowing for personalized therapy sessions [18; 19; 20]. It is useful for focused, intensive cognitive tasks, as well as for simulating real-life environments that are difficult to reproduce. This type of  
Figure 3: Multi-Dimensional VR Cognitive Rehabilitation Theory Model.  
rehabilitation therapy system is more suitable for stroke patients and Parkinson's disease patients, among others [21].  
[PERSON] et al. (2012) [22] constructed a individual immersive virtual reality system consisting of head-mounted VR equipment and sensor gloves. Through repeated analysis of variance of virtual hand data from eight chronic stroke patients in VR, the authors discovered that visual feedback can be an effective method for selectively modulating M1 activity. VR training stimulated the contralateral brain areas related to hand control, which is beneficial for the recovery of function after stroke.  
Following this, [PERSON] et al. (2016) [23] developed a individual immersive VR application, mobile-based VR. They employed a randomized controlled trial method. The control group received only standard hospital environment therapy: the use of standardized medical tools and toys managed by physical therapists. The experimental group received hospital environment therapy supplemented by virtual reality therapy. Data from the Ber balance scale indicated that the patients in the experimental group had better improvements in their sensory systems. The results suggest that using this system as a supplement to traditional hospital rehabilitation can enhance the duration and quality of patient recovery.  
In 2020, in the cognitive rehabilitation treatment of PD patients, [PERSON] et al. (2020) [24] randomly assigned 51 Parkinson's patients to a VR rehabilitation program or a traditional rehabilitation program. The VR group utilized motion analysis equipment and NIRVANA (NIRVANA is a markerless system based on optoelectronic infrared devices, allowing patients to engage in complete auditory and visual sensory immersion exercises in a virtual environment). A series of specific interactive tests were conducted on patients in VR rehabilitation scenarios. Statistical analysis revealed that participants in the VR group had better outcomes in various functional areas compared to those who received traditional rehabilitation. Specifically, the VR group showed greater improvements in balance (Balance Berg Scale, BBS), walking (Dynamic Gait Index, DGI), arm function (Disabilities of the Arm, Shoulder and Hand scale, DASH scale), and the psychological aspects of quality of life (Mental Composite Score, MCS) compared to the traditional group.  
[PERSON] et al. (2019) [25] developed a prototype of an immersive VR toolkit with six dimensions, providing intensive, task-specific training for complex movement tasks required for walking in a safe and ecological virtual environment for the community. This toolkit combines VR and on-site training practices, enhancing community walking ability after stroke.  
These studies indicate that while individual immersive systems have advantages such as high immersion and personalized experience, they also have some limitations. For example, they may lead to a sense of isolation for users, reducing opportunities for social interaction with others. Additionally, the highly immersive environment may also cause some users to experience motion sickness or other discomfort.