The man, the myth, the legend Bill Follette, PhD, helps me to unpack functional vs. topographical, mid-level terms, and a sweeping tour of the principals that make CBS. Bill is a professor of psychology at University of Nevada at Reno: https://www.unr.edu/psychology/faculty/william-follette
Also available as a audio only podcast:
https://www.marceltassara.com/actroottofruit
Ole Ivar Lovaas work with children Autism:
https://www.youtube.com/watch?v=MZ7TiFJzZkM