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The aim of this review is to provide an overview on prevalence and clinical tools for the diagnosis of apathy, as well as on neurophysiological and neuroimaging findings obtained from studies in patients with apathy in different forms of dementia, including Alzheimer’s disease (AD), vascular (VaD) and mixed dementia, frontotemporal dementia (FTD), and Parkinson’s disease dementia (PDD).

Randomized controlled trials, non-randomized controlled trials, controlled before–after studies, and interrupted time series from four databases (WebOfScience, Scopus, Pubmed, and PsycINFO) addressing apathy in adults or older people aged over 65 years of age affected by dementia were included.

The prevalence of apathy was 26–82% for AD, 28.6–91.7 for VaD, 29–97.5% in PDD, and 54.8–88.0 in FTD. The assessment of apathy was not consistent in the reviewed studies. Methylphenidate was …