If you follow enough high school and college sports, you can readily identify this issue in modern-day sports.
You see it at every level of competitive play where players are competing for playing time and making rosters. You see it in how many college athletes transfer for greener pastures. And you see it when coaches "run off" some players.
It's body language.
It is the way players are either plugged in or are not when things get tough, when things don't go their way.
It is an issue brought to great perspective in a Saturday press conference in the NCAA Women's Tournament. The comments were made by Hall of Fame coach Geno Auriemma at UConn.
But it applies across the board for both men and women.
Here is a video of what Auriemma said.
"I'd rather lose than watch the way some kids play the way they play. I'd rather lose, " said Auriemma.
"They're allowed to get away with just whatever, and they're always thinking about themselves. Me, me, me, me. I didn't score so why should I be happy. I'm not getting enough minutes, why should I be happy. That's the world we live in today, unfortunately. Kids check the scoreboard sometimes because they're going to get yelled at if they don't score enough points. Don't get me started."