The purpose of this study is to investigate whether markers of brain structure and function from MRI are associated with different levels of spatial orientation and gait parameters in people with mild cognitive impairment or dementia due to Alzheimer's disease when walking through a real world environment.

This is an experimental cross-sectional study which primarily aims at identifying characteristic features of spatial disorientation among people with mild cognitive impairment and dementia. The features of interest are motion and physiological related changes that occur during instances of spatial disorientation, which will be derived from wearable sensors.

Additionally, brain structure and functional connectivity changes associated with different levels of spatial orientation and gait parameters will also be investigated through resting-state functional imaging.

Inclusion Criteria:

• 50 years and above
• Mini mental state examination (MMSE) ≥ 12 < 28 points for experimental group
• Mini mental state examination (MMSE) ≥ 28 points for control group
• Sufficient knowledge of German to understand participant information, declaration of consent and questionnaires
• Dated and signed declaration of consent
• Sufficient mobility and motivation to participate in the study

Exclusion Criteria:

• Less than 50 years
• Significantly impaired vision or hearing
• Severely reduced mobility: cannot move around independently (even with aids)

Healthy older adults and older adults with mild cognitive impairment or dementia