23. The computer-implemented system of claim 19 , wherein learning the function mapping comprises: using a loss function with one of a linear function and a non-linear function; and identifying a set of optimal weights that produce a minimum of the loss function.
19. A computer-implemented system for assessing brain health of a person, wherein the computer-implemented system comprises a processor executing instructions for learning a function mapping, the computer-implemented system: receiving inputs from a data collection module installed at one or more electronic devices, 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; computing, by the computing system, 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 outputting, by the computing system, the brain health metric.