Click here to view The Quadrant Model diagram, and learn more about it.  To submit a question for us to answer on the podcast, go to brainjo.academy/question. To subscribe to The Brainjo Connection, a free, twice-monthly newsletter about the latest science of how to keep the brain fit and healthy, along with our recommended products, books, tools, and other resources for doing so, go to: brainjo.academy/connection To learn more about how you can boost brain fitness with neuroscience-based musical instruction, head to brainjo.academy.  Intro and Outro music composed and produced by Julienne Ellen.