"in the words of psychologists John Brebner and Chris Cooper, who have shown that extroverts think less and act faster on such tasks: introverts are "geared to inspect" and extroverts "geared to respond." But the more interesting aspect of this puzzling behavior is not what the extroverts do before they've hit the wrong button, but what they do after. When introverts hit the number nine button and find they've lost a point, they slow down before moving on to the next number, as if to reflect on what went wrong. But extroverts not only fail to slow down, they actually speed up."