Dr Sebastian Crutch is an Alzheimer’s Research UK Senior Research Fellow and Clinical Psychologist working in the Dementia Research Centre at the UCL Institute of Neurology. His research has focused on the neuropsychological investigation of language and perceptual function in individuals with neurodegenerative disease and stroke. He is involved in a number of cross-sectional and longitudinal studies characterising the progression and evolution of conditions such as Alzheimer’s disease and frontotemporal lobar degeneration. He is particularly interested in visual disorders and disease progression in posterior cortical atrophy (PCA). He leads the ESRC-NIHR study ‘Seeing what they see: compensating for cortical visual dysfunction in Alzheimer’s disease’ (www.ucl.ac.uk/dementia-vision) and the PCA Support Group for patients and carers (http://www.ucl.ac.uk/drc/pcasupport).