Study to Investigate Safety, Tolerability and Pharmacokinetics of a Single Ascending Dose of AZD1704

Inclusion Criteria: * Healthy volunteers, man or woman of non child-bearing potential * Provision of signed informed consent. Exclusion Criteria: * History of somatic disease/condition that may interfere with the objectives ot the study, as judged by the Investigator. History of seizures, with the exception of single occasions fever induced seizures in childhood. * History of previous or ongoing psychiatric disease/condition including psychosis, affective disorder, anxiety disorder, borderline state and personality disorder according to the criteria in the DSM of Mental Disorder, 4th edition * History of use of antipsychotic, antidepressant or anxiolytic drugs for the treatment of psychiatric disease or symptoms, prescribed as well as non-prescribed use.