["alzheimer's disease"]
['jnj-54861911, 10 mg', 'jnj-54861911, 50 mg', 'placebo']

        Inclusion Criteria:

          -  Participant must have had sufficient education or work experience to exclude mental
             retardation based on Diagnostic and Statistical Manual of Mental Disorders 4th
             edition, Text Revision (DSM-IV-TR) and must be able to read and write and must have
             adequate hearing and visual acuity to complete the required psychometric tests

          -  Participant must have a Clinical Dementia Rating Scale- Japanese version (CDR-J) score
             of '0' and as such rated as normal

          -  Participant must have evidence of amyloid deposition as demonstrated by low
             Cerebrospinal Fluid (CSF) Amyloid (A)-beta 1-42 levels at Screening

          -  Participant must have a body mass index between 18 and 35 kilogram per square meter,
             inclusive, at Screening

          -  Participant must be otherwise healthy for their age group or medically stable with or
             without medication on the basis of physical examination, medical history, vital signs,
             and 12-lead electrocardiogram (ECG) performed at Screening or at Baseline

        Exclusion Criteria:

          -  Participant has evidence of any brain disease other than potential very early signs of
             Alzheimer's disease (AD) or typical age related changes, or any other abnormality that
             could explain a possible cognitive deficit

          -  Participant has been diagnosed with dementia due to AD, due to other diseases, or with
             AD and contribution of other disorders (mixed dementia)

          -  Participant has evidence of familial autosomal dominant AD

          -  Participant has any contra-indications for Magnetic Resonance Imaging (MRI) (for
             example, prostheses, implants, claustrophobia, pacemakers, and others)

          -  Participant has a clinically significant abnormal physical- or neurological
             examination, vital signs or 12-lead ECG (including QTc greater than 450 millisecond
             for males and females, left bundle branch block, atrio-ventricular [AV] block second
             degree or higher, permanent pacemaker or implantable cardioverter defibrillator [ICD])
             at Screening or Baseline, which in the opinion of the investigator is not appropriate
             and reasonable for the population under study
      