The functions themselves are obviously discrete because they are set in stone - but in practice they are continuous because the strength of one implies the weakness of another. I think the quadra cycles show how much someone uses at the expense of for example - but I don't think they are directly cooperative. E.g. doesn't 'support' , it appears when is weak.

If you think the quadra cycles are continuous, it probably means you think the brain actively chooses which function to use, but if you think they are discrete, you probably think the brain utilises functions seemingly by accident, by the pressures of the current moment. (It's possible it could be a mixture of the two - e.g. the brain is already hard-wired for some functions at the expense of others, but it is also able to adapt on the spur of the moment).