> In 1956, the renowned cognitive psychologist George Miller published one of the field’s most widely cited papers, “The Magical Number Seven, Plus or Minus Two.” In it, he argued that although the brain can store a whole lifetime of knowledge in its trillions of connections, the number of items that humans can actively hold in their conscious awareness at once is limited, on average, to seven.

So, your mind can hold 4-5, not 7 things at the same time or it goes "out of sync"

edit: added quote.