Loss of the ability to experience pleasure - or anhedonia - has been revealed as a key feature in frontotemporal dementia, in contrast to Alzheimer's disease. The findings from brain scans, believed to be a first, show grey matter deterioration in the so-called pleasure system of the brain - these regions were distinct from those implicated in depression or apathy, suggesting a possible treatment target for the early-onset dementia that affects people from 40-65 years.