The study alludes to a disconnect between confidence and performance: Feeling confident about performance does not equal competent performance. But that feeling of confidence can trump information about the impact of distractions, sleep loss, alcohol, or illness on performance. And driving a car is the most widespread activity in the world that has the potential to seriously injure oneself and others. But a lot of folks injure themselves walking while conversing, texting, or reading. Participating in a conversation consumes more mental bandwidth than listening.