Answer:
The relationship between attention and cognition is that attention places limits upon what an individual thinks about while allowing that individual to determine what such things as thoughts, beliefs, words, and deeds are about at any given time. The economics of attentional budgeting dictate that human beings can do multiple tasks simultaneously only if the requisite cognitive load is within their budget, but that performance will suffer (or break down entirely) if cognitive load exceeds the attentional budget.