The fearless dominance associated with psychopathy may be an important predictor of U.S. presidential performance, suggests an analysis published this week in the Journal of Personality and Social Psychology.

"Certain psychopathic traits may be like a double-edged sword," says lead author Scott Lilienfeld, a psychologist at Emory University. "Fearless dominance, for example, may contribute to reckless criminality and violence, or to skillful leadership in the face of a crisis."

In fact, fearless dominance, linked to diminished social and physical apprehensiveness, appears to correlate with better-rated presidential performance for leadership, persuasiveness, crisis management and Congressional relations, the analysis showed.

Theodore Roosevelt ranked highest in fearless dominance, followed by John F. Kennedy, Franklin D. Roosevelt, Ronald Reagan, Rutherford Hayes, Zachary Taylor, Bill Clinton, Martin Van Buren, Andrew Jackson and George W. Bush.

The analysis drew upon personality assessments of 42 presidents, up to George W. Bush, compiled by Steven Rubenzer and Thomas Faschingbauer for their book "Personality, Character and Leadership in the White House." More than 100 experts, including biographers, journalists and scholars who are established authorities on one or more U.S. presidents, evaluated their target presidents using standardized psychological measures of personality, intelligence and behavior.

For rankings on various aspects of job performance, the analysis relied primarily on data from two large surveys of presidential historians: One conducted by C-SPAN in 2009 and a second conducted by Siena College in 2010.

The rich historical data on presidents, combined with detailed expert rankings, provided a window into an emerging theory that some aspects of psychopathy may actually be positive adaptations in certain social situations.

"The way many people think about mental illness is too cut-and-dried," Lilienfeld says. "Certainly, full-blown psychopathy is maladaptive and undesirable. But what makes the psychopathic personality so interesting is that it's not defined by a single trait, but a constellation of traits."

A clinical psychopath encompasses myriad characteristics, such as fearless social dominance, self-centered impulsivity, superficial charm, guiltlessness, callousness, dishonesty and immunity to anxiety. Each of these traits lies along a continuum, and all individuals may exhibit one of more of these traits to some degree.

"You can think of it like height and weight," Lilienfeld explains. "Everyone has some degree of both, and they're continuously distributed in the population."

The results of the analysis raise the possibility that the boldness often associated with psychopathy may confer advantages over a variety of occupations involving power and prestige, from politics to business, law, athletics and the military.

The findings also add to the debate over the idea of the so-called "successful psychopath," an individual with psychopathic traits who rises to a position of power in the workplace.

"We believe more research is needed into the implications of boldness for leadership in general," Lilienfeld says.

The analysis found that the link between fearless dominance and political performance was linear, Lilienfeld notes, but he added that at the extremes, boldness might veer into a form of recklessness that would be detrimental.

The researchers also looked at presidential scores for self-centered impulsivity, which in contrast to boldness, was linked to some negative job performance indicators, including Congressional impeachment resolutions, tolerating unethical behavior in subordinates and negative character.

Theodore Roosevelt, for instance, ranked the highest for fearless dominance, but lower than average for self-centered impulsivity, suggesting that he was far from being psychopathic.

Lyndon Johnson, however, ranked relatively high for fearless dominance (15th) and was among the top-five scorers for self-centered impulsivity. "That's consistent with what we know about Johnson," Lilienfeld says. "He was a very dominant, socially bold person, at times even ruthless about getting his way. In some sense, these traits may have made him an effective leader, able to push through civil rights legislation, but they may not have been so positive in terms of personal relationships."

Source: Emory University