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Copyright 2016 NPR. To see more, visit NPR.

The first presidential debate tonight is shaping up to be one of the most-watched political events ever, with a potentially Super Bowl-size audience.

Here are four things to watch for as Hillary Clinton and Donald Trump take the stage at Hofstra University on Long Island.

1. Which Trump shows up

Donald Trump "won" the primary debates by dominating his opponents, often by name-calling and bluster. This one will be different.

There's growing evidence that a physical injury to the brain can make people susceptible to post-traumatic stress disorder.

Studies of troops deployed to Iraq and Afghanistan have found that service members who suffer a concussion or mild traumatic brain injury are far more likely to develop PTSD, a condition that can cause flashbacks, nightmares and severe anxiety for years after a traumatic event.

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(SOUNDBITE OF BRUCE SPRINGSTEEN SONG, "BORN IN THE U.S.A.")

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(SOUNDBITE OF BUCKWHEAT ZYDECO SONG, "ZYDECO LA LOUISIANEE")

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