Comparisons between the results of many types of analyses, in particular those employing sensory signals and cognitive inputs, yield a wide spectrum of interpretations relating to disease differentiation, disease progression, and response to medication. In Alzheimer's disease, schizophrenia, mild cognitive impairment, and BD, cognitive deficit varies with illness stage, patient age, and cultural considerations, meaning that cognitive deficits can only be demonstrated after comparing results from sensory and cognitive signals.2-4