1. A computer-implemented means for assessing brain health of a person based on the person's use of one or more electronic devices, wherein the computer-implemented means comprises a processing means, and wherein: a. the computer-implemented means receives inputs from a data collection module installed at the one or more electronic devices, the inputs received at the computer-implemented means comprising the processing means executing instructions for learning a function mapping, the inputs associated with one or more interactions of the person with the one or more electronic devices, the inputs recorded by the data collection module without requiring additional actions by the person while the inputs are recorded; b. computing, by the computer-implemented means, a brain health metric by learning the function mapping from the inputs to the brain health metric, wherein the brain health metric is a percentile rank relative to a population of users, the brain health metric indicating the person's likelihood of being in at least one of a cognitive state and a neuropsychological state; and c. outputting, by the computer-implemented means, the brain health metric.