Rick Riordan said this quote

Taken together, it’s almost a sure sign. The letters float off the page when you read, right? That’s because your mind is hardwired for ancient Greek. And the ADHD-you’re impulsive, can’t sit still in the classroom. That’s your battlefield reflexes. In a real fight, they’d keep you alive. As for the attention problems, that’s because you see too much, Percy, not too little. Your senses are better than a regular mortal’s.