Inclusion Criteria:  Dementia with Lewy bodies (criteria according to McKeith, Neurology 2017).  Exclusion Criteria:  Cerebrovascular disorders, previous stroke, hydrocephalus, and intra-cranial mass documented by MRI. History of traumatic brain injury or other neurological diseases. Serious medical illness other than DLB History of seizures Pregnancy Metal implants in the head (except dental fillings) Electronic implants (i.e. pace-maker, implanted medical pump) Age <18 years