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Imagine you are a venture capitalist. One day a man comes to you and says, "I want to build the game layer on top of the world."

You don't know what "the game layer" is, let alone whether it should be built atop the world. But he has a passionate speech about a business plan, conceived when he was a college freshman, that he says will change the planet — making it more entertaining, more engaging, and giving humans a new way to interact with businesses and one another.

If you give him $750,000, he says, you can have a stake in what he believes will be a $1-billion-a-year company.

Interested? Before you answer, consider that the man displays many of the symptoms of a person having what psychologists call a hypomanic episode. According to the Diagnostic and Statistical Manual — the occupation's bible of mental disorders — these symptoms include grandiosity, an elevated and expansive mood, racing thoughts and little need for sleep.

"Elevated" hardly describes this guy. To keep the pace of his thoughts and conversation at manageable levels, he runs on a track every morning until he literally collapses. He can work 96 hours in a row. He plans to live in his office, crashing in a sleeping bag. He describes anything that distracts him and his future colleagues, even for minutes, as "evil."

He is 21 years old.

So, what do you give this guy — a big check or the phone number of a really good shrink? If he is Seth Priebatsch and you are Highland Capital Partners, a venture capital firm in Lexington, Mass., the answer is a big check.

But this thought exercise hints at a truth: a thin line separates the temperament of a promising entrepreneur from a person who could use, as they say in psychiatry, a little help. Academics and hiring consultants say that many successful entrepreneurs have qualities and quirks that, if poured into their psyches in greater ratios, would qualify as full-on mental illness.

Which is not to suggest that entrepreneurs like Seth Priebatsch (pronounced PREE-batch) are crazy. It would be more accurate to describe them as just crazy enough.

"It's about degrees," says John D. Gartner, a psychologist and author of "The Hypomanic Edge." "If you're manic, you think you're Jesus. If you're hypomanic, you think you are God's gift to technology investing."

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Monday, September 20, 2010