All participants will 16 sessions over eight weeks, with two sessions per week, each lasting 70 minutes. Participants in the fi-VRCT will use the virtual reality system with head-mounted display and handheld controllers. The fi-VRCT will be administered by an experienced research assistant.

The MoCA comprises12 items, it assesses orientation to time and place, attention, concentration, short-term memory, \working memory, visuospatial abilities, language, and executive function. Scores on the MoCA range from 0 to 30, with a higher score indicative of better global cognition. A total score of 26 or above is considered within the normal cognitive function range, while a total score of 18 to 25 indicates mild cognitive impairment

The Wechsler Memory Scale is a neuropsychological test designed to assess memory in adults aged 16 to 90. Family Pictures, Spatial Span, and Word List will be used to evaluate visual, auditory, immediate, delayed, and working memory. For each subtest, higher scores indicate better performance in memory performance. Based on age ranges, raw scores will be transformed into scaled scores ranging from 1 to 19.

The questionnaire is informant-reported and is typically completed by a caregiver. It comprises 30 items in seven categories: household activities, household appliances, finances, work, computer use, appliances, and leisure activities. Each item is rated based on the difficulty levels in performing it, ranging from no difficulty in performing the task to no longer being able to perform it. Score ranges from 0 to 100 and lower score indicates better functional ability.

The Lawton Instrumental Activities of Daily Living is commonly employed to assess participants' ability to perform daily tasks and identify early functional decline. In semi-structured interviews, participants describe how they currently perform the eight IADLs. Each item is rated based on the levels of competence, ranging from independence in performing the activity to not being able to perform it at all. Score ranges from 8 to 31 and higher scores indicate better functional ability.

Participants will be verbally presented with a random series of digits and asked to repeat them in the same order presented (forward span), in the reverse order (backward span), or ascending order (serial span). The raw score is determined by the number of the correct items and is transformed into a scaled score ranging from 1 to 19. Higher scores indicate better performance.

The questionnaire evaluates the extent to which participants feel a sense of presence within the virtual environment. It comprises 17 items grouped into three categories: involved/control, natural, and interface quality. It employs a seven-point Likert scale, and the score ranges from 17 to 119. Higher scores indicate a stronger sense of presence.