BIOLOGICAL SYMBOLIC STRUCTURES. “If propositions are symbolic constructions which may exist in mind apart from language, this suggests that there must be symbolic systems in the brain, unrelated to human languages and developmentally prior to them. In other words, it’s possible that there are symbolic mechanisms of a biological nature which are fundamental to human activity.” (Charles Pinter, Mind and the Cosmic Order, a fabulous book).
https://link.springer.com/content/pdf/10.1007/978-3-030-50083-2.pdf