The study is being performed in order to learn more about AZD3480 (potential as treatment for patients with Alzheimer's Disease) and to investigate how much of AZD3480 is bound to the nicotinic receptors in the brain at different concentrations of AZD3480 in blood, as well as to investigate the period of time for this binding.

Inclusion Criteria:

• Physically Healthy volunteers
• Genotyped with regard to CYP2D6
• Normal MRI scan at Visit 2

Exclusion Criteria:

• Known or suspected drug or alcohol abuse or positive drugs of abuse screen as judged by the investigator.
• Participation in a PET examination as part of a scientific study during the past twelve months.
• Prescribed or non-prescribed from two weeks prior to the first PET examination. Occasional paracetamol and nasal spray for congestion will be allowed as medication.