Compelling article at the NYTimes, The Secret Lives of Just About Everybody:
But in a series of experiments over the past decade, psychologists have identified a larger group they call repressors, an estimated 10 to 15 percent of the population, who are adept at ignoring or suppressing information that is embarrassing to them and thus well equipped to keep secrets, some psychologists say.
Repressors score low on questionnaires that measure anxiety and defensiveness – reporting, for example, that they are rarely resentful, worried about money, or troubled by nightmares and headaches. They think well of themselves and don’t sweat the small stuff.
Although little is known about the mental development of such people, some psychologists believe they have learned to block distressing thoughts by distracting themselves with good memories. Over time – with practice, in effect – this may become habitual, blunting their access to potentially humiliating or threatening memories and secrets.
“This talent is likely to serve them well in the daily struggle to avoid unwanted thoughts of all kinds, including unwanted thoughts that arise from attempts to suppress secrets in the presence of others,” Dr. Wegner, of Harvard, said in an e-mail message.