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The present invention provides a method for assessing brain health in a subject, comprising the steps of administering one or more visual perception tests to the subject; obtaining a measurement of behavioural responses during the one or more visual perceptual tests and extracting indices of perceptual ability for each test from the behavioural responses; and/or obtaining a measurement of electrophysiological responses of the subject during administration of the one or more visual perception tests, and extracting indices from the electrophysiological responses for each task, wherein a time-based correlation of events occurring during the tests with the obtained electrophysiological responses is also obtained; and comparing the obtained behavioural indices, the obtained electrophysiological indices, or both with a comparative data set of healthy older adults with normal cognition, or a historical data set of the same …