Psychometric tests have revealed that professional comedians are shyer than most ordinary people, contrary to public perceptions.
A recent study by anthropologists at the University of New Mexico in Albuquerque involved 31 comedians passing through the city's comedy club, Laffs.
They were asked to sit a 60 question personality test to gauge the five classic personality traits; openness to experience, conscientiousness, extroversion, agreeableness and neuroticism.
The researchers then compared their scores to those of 400 university students and 10 humour writers.
On average, the professional comics - all but three of them being men - scored highly on openness to new experience compared with students, yet lower than comedy writers.
The comedians also had lower scores on average for conscientiousness, agreeableness and extroversion, compared with the other groups. The team noticed no difference in neuroticism scores.
Speaking to New Scientist magazine, researcher Gil Greengrass said she guessed that the stage gives them the opportunity to be what they want to be and may not necessarily represent their daily-life personalities.
She added that they spend a lot of time by themselves and also travel a lot, which might explain why they do have introverted personalities.