Memory formation under stress in humans: Iinvestigation into the importance of hormone receptors.

1. Male, healthy volunteers;

2. Age 18 - 35 years;

3. Normal or corrected-to-normal vision;

4. Normal uncorrected hearing;

5. Body mass index between 18.5 and 30;

6. Willingness and ability to give written informed consent and willingness and ability to un-derstand the nature and content, to participate and to comply with the study requirements.

1. Anuria;

2. Acute or history of renal insufficiency / impairment of renal excretory function (or creatinine levels > 1.1 mg/dl at screening);

3. Hyperkalemia (or potassium levels of > 5.0 mEq/L at screening);

4. History of psychiatric treatment /current psychiatric treatment;

5. History of neurological treatment /current neurological treatment;

6. History of endocrine treatment /current endocrine treatment;

7. History of autonomic failure (e.g., vasovagal reflex syncope);

8. History of psychotropic medication (e.g. antidepressants);

9. History of hepatic impairments;

10. History of cardiovascular diseases;

11. Hypotension (< 90 / 60 mmHG);

12. Bradycardia / Tachycardia (heart rate < 50 or > 100 at rest);

13. Use of any medication on a regular basis;

14. Metal objects in or around the body;

15. Irregular sleep/wake rhythm (e.g., regular nightshifts or cross timeline travel);

16. Claustrophobia;

17. Use of recreational drugs weekly or more often;

18. Smoking of more than 5 cigarettes per day;

19. Average use of more than 3 alcoholic beverages daily and self-reported inability or un-ease to cease drinking alcohol for 24 hours prior to testing;

20. Coffeine consumption 24 hours before testing;

21. Professional sports or participation in competitions (as Spironolacton can lead to a positive doping test).