Please assess the completion status of the following clinical trial:

Trial Title: The Influence of Glutamate on Memory in Humans

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: BASIC_SCIENCE
- Time Perspective: None
- Masking: DOUBLE
- Phase: None
- Number of Arms: 8.0

Eligibility Criteria:
Inclusion Criteria:~* German native language or native language level~* Able to give written informed consent~* right-handed~Exclusion Criteria:~* inability to give written informed consent, underaged minors, contractually incapable persons, persons in legal custody~* any psychiatric, neurological or internal illness~* hematoporphyria (enzyme sickness)~* intake of medication (except oral contraceptives)~* simultaneous participation in other clinical studies~* hypersensitivity to Memantine or other anti-dementia substances, or to D-Cycloserine~* alcohol abuse~* epilepsy~* depression~* serious anxiety or psychosis~* serious kidney insufficiency~* intake of Ethionamide or Isoniazide~* pregnancy or women who are nursing~* liver or kidney problems~* intake of NMDA-antagonists, such as Amantadine, Ketamine, or Dextromethorphan~* vegetarians~* stomach ulcer, if treated with medication~* renal tubular acidosis~* urinary infections (with proteus bacteria)~* recent heart attack, heart failure, or uncontrolled high blood pressure~* intake of L-Dopa, dopaminergic agonists, and anticholinergics~* intake of barbiturates, spasmolytics, Phenytoin, Amantadine, oral coagulators, warfarin, HCT (Hydrochlorothiazide)~* heart or cranial operations~* pacemaker, medication pump (such as insulin pump), hearing aid, removable prosthodontics~* metal in or on body (such as acupuncture needles, artificial limbs, stents, metal splints, clips, implanted electrodes, tattoos, or piercings)~* claustrophobia

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 35 Years
- Healthy Volunteers: t

Study Arms:
- Sugar pill, behavioral glutamic acid (Type: PLACEBO_COMPARATOR): Placebo condition for D-Cycloserine
- Sugar pill, fMRI, glutamic acid (Type: PLACEBO_COMPARATOR): Placebo condition for D-Cycloserine, fMRI
- Sugar pill, memantine, behavioral (Type: PLACEBO_COMPARATOR): Placebo condition Memantine, behavioral
- Sugar pill, memantine, fMRI (Type: PLACEBO_COMPARATOR): Placebo condition Memantine, fMRI
- D-Cycloserine behavioral (Type: ACTIVE_COMPARATOR): None
- D-Cycloserine, fMRI (Type: ACTIVE_COMPARATOR): None
- Memantine, behavioral (Type: ACTIVE_COMPARATOR): None
- Memantine, fMRI (Type: ACTIVE_COMPARATOR): None

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