The purpose of this study is to investigate the safety and tolerability of AZD2066 using multiple escalating dose panels. There will be separate panels for young healthy volunteers and elderly healthy volunteers. Each panel will contain 10 volunteers who will randomly receive AZD2066 or placebo. One panel will be run at a time with a fixed dose given. After the completion of each panel, a Safety Review Committee will decide if the study can proceed to the next dose panel.

Inclusion Criteria:

• Provision of signed informed consent
• Clinically normal physical findings and laboratory values as judged by the investigator and a normal resting ECG.

Exclusion Criteria:

• History of somatic disease/condition, which may interfere with the objectives of the study, as judged by the investigator.
• History of previous or ongoing psychiatric disease/condition including psychosis, affective disorder, anxiety disorder, borderline state and personality disorder.
• Intake of medicine (except occasional paracetamol or nasal spray) within first 2 weeks before first administration of study drug.