Please assess the completion status of the following clinical trial:

Trial Title: Enhancing Spatial Navigation Using Non-Invasive Brain Stimulation

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: CROSSOVER
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: DOUBLE
- Phase: None
- Number of Arms: 4.0

Eligibility Criteria:
Inclusion Criteria:~General inclusion criteria (all participants):~* All medications stable for approximately 1-2 months;~* No history of severe mental illness;~* No current untreated alcohol or substance abuse/dependence;~* English as native and preferred language;~* MRI-compatible if taking part in fMRI studies~* Able to give informed consent.~MCI Inclusion Criteria:~* Diagnosis of amnestic MCI based on criteria set forth by Petersen (2004). Additionally, other potential causes of cognitive deficit ruled out by the referring physician;~Healthy older adults~* intact cognitive functioning as measured by neuropsychological testing~Exclusion Criteria:~* History of neurological disease or injury~* History of severe mental illness~* Current untreated alcohol or substance abuse~* Other conditions may exclude; please discuss with contact

- Gender: ALL
- Minimum Age: 50 Years
- Maximum Age: 88 Years
- Healthy Volunteers: t

Study Arms:
- Cognitively intact older adults - ACTIVE tDCS (Type: EXPERIMENTAL): Group receives active brain stimulation
- MCI ACTIVE tDCS (Type: ACTIVE_COMPARATOR): Group receives active brain stimulation
- Cognitively intact older adults - SHAM tDCS (Type: SHAM_COMPARATOR): Group receives sham brain stimulation
- MCI SHAM tDCS (Type: SHAM_COMPARATOR): Group receives sham brain stimulation

Based on this trial design, predict the completion outcome and termination type (if applicable).