DIagnostic Biomarkers and Symptoms in Patients With Alzheimer's Disease and Lewy bodY Dementia

Inclusion criteria for healthy controls (HC): * Age 18 - 40 years of age * Able to cooperate as evaluated by the primary investigator (PI) * Able to give informed consent Exclusion criteria * Signs of neurological/psychiatric conditions * Known genetic neurodegenerative disease in close family Inclusion criteria for patients with Dementia with Lewy Bodies (DLB): * Probable DLB (McKeith et al., 2017) or MCI-LB (McKeith et al., 2020) * Age \> 50 years of age * Able to give informed consent * Able to cooperate as evaluated by the PI * MCI, mild or moderate dementia, and MMSE \> 18 Exclusion criteria for patients with DLB: * Patients not able to give informed consent. * Current alcohol or drug abuse * Terminal illness * Diagnosed with major neurological/psychiatric conditions other than DLB. Inclusion criteria for controls (patients with Alzheimer's disease (AD)): * Probable AD (McKhann et al., 2011) or MCI-AD (Albert et al., 2011) * Age \> 50 years of age * Able to give informed consent * Able to cooperate as evaluated by the PI * MCI, mild or moderate dementia, and MMSE \> 18 Exclusion criteria for controls (patients with AD): * Patients not able to give consent. * Current alcohol or drug abuse * Terminal illness * Diagnosed with major neurological/psychiatric conditions other than AD.