Auditory: I can't tell you how accustomed to hearing stuff constantly everyone is. Cars (even just the tires on a busy street), Air Handling, Refrigerators, Beeping timers (ovens/microwaves/calendar reminders).
Visual: Web notifications, web advertisements, billboards, "news," spam phone calls/texts.
Social: Many people have an expectation that sending a message entitles them to an immediate response. In the age of quick answers from Google, people often forget about slowing down for the speed of thought.
Mental: We (humans) can only make so many decisions in a day yet we are overwhelmed with false dichotomies constantly in order to choose one or the other of basically the same thing.