Adolescence is a period of change that crucially increases vulnerability to depression. Studies report blunted neural responses to reward that relate to positive affect and depression symptoms in adolescents. However how these results relate to the symptom of anhedonia in adolescents is not entirely clear. Anhedonia is not a unitary construct, but is described as having different processes (e.g. wanting vs. liking) each underpinned by different neurobiological pathways. Current studies report inconsistencies in findings when trying to relate reward processing at the behavioural and neural level with symptoms. One reason for this is the lack of specificity of clinical, behavioural and neural tasks for measuring reward in depression. Links between the experience of anhedonia in adolescent depression and the behavioural and neural measures of reward could be improved with more detailed questionnaires, more detailed measurements of the components of reward for e.g. decreased motivation/effort and more ecologically valid tasks relevant to adolescents, in the MRI scanner. Prevalence of adolescent depression Major Depressive Disorder (MDD) is characterized by persistent sadness, loss of interest or pleasure, feelings of worthlessness or guilt, sleep disturbances, poor concentration and suicidal thoughts. The World Health Organisation reports that depression is the predominant cause of illness and disability for both boys and girls aged 10 to 19 years [1]. As adolescence is a time of physical, social and psychological change, it is easy to see how this could contribute to mental health problems. Early-onset adolescent depression has a detrimental impact on normal development and leads to poorer outcomes in adulthood. Harrington et al., found that 60% of adults with adolescent onset depression experienced one or more episodes of MDD in adulthood compared to 27% in the control group [2]. Additionally a significant increased risk of later anxiety disorder, nicotine dependence,