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This study is looking at determine whether task-evoked pupil response profiles sensitively quantify cognitive impairment, differ between cohorts, and track change over time for people with Alzheimer s Disease, depression, Mild Cognitive Impairment, or Dementia. Participants mainly provide questionnaire, assessment, or follow-up information rather than receiving a new study treatment. Taking part may give some people access to a digital support tool with regular follow-up, but direct benefit is not guaranteed.
