For example, I max out at 3. I can play a game, keep a conversation going with my wife, and keep an eye on my dog all at once. However, I usually lose track of at least one of those activities. I can keep track of two things without ever missing a beat. Stuff like watching TV while gaming or listening to a podcast while reading. My wife has trouble focusing on two things at once but she focuses on that one thing better than I ever could.