Thanks for quoting someone I've ignored.
Chomsky is yet another useless (albeit tla.mit.gov funded) first world anarchist. I trust him about as far as I can throw him.
Some aspects of the brain, of thought etc are hierarchical, some are not.
Heterarchy may be defined as the relation of elements to one another when they are unranked or when they possess the potential for being ranked in a number of different ways.
My
rugged descent has exceeded Chomskys World of Forms unto postmodern Epicureanism and the heterarchy hereof.