As random as the topic may seem, personality differences between right and left handed persons have been a topic of much study. Much of the research seems contradictory, see this review.

Research thus far seems to have been hampered by what seem insufficient sample sizes (most seem to have n=~200), which is not a problem here.

To add to this research, upon the completion of the Big Five Personality Test participants were asked to indicate their handedness with the choices “right” ,”left”, “ambidextrous”, “don’t want to answer”. The question was included for 2361 individuals. The break down in responses was n=2029, 248, 63, 21 respectively (13.3% identified as non-right handed compared to an estimated 11% of the population).

The differences in their big five personality traits are tabled below.

Trait Right Left p
Extraversion 3.09 3.01 0.22
Neuroticism 2.97 2.92 0.35
Agreeableness 3.9 3.92 0.71
Conscientiousness 3.4 3.4 0.99
Openness to experience 3.94 4.01 0.1

No differences were statistically significant at the p>0.05 level.

The spinning dancer illusion, as seen on the right, was created by web designer Nobuyuki Kayahara in 2003. Because it lacks the visual cues used to determine depth, it can be seen as spinning in either direction.

Around 2007/2008 it was widely circulated as a right-left brain personality test. That the image can serve as a personality test has been dismissed by skeptics, which is reasonable as their is no evidence for the proposition. It would be nice to have a concrete answer though, so, to that end, the illusion was appended to the Big Five Personality Test as a “research item” and people who took the test were directed to indicate which direction they saw the image spinning (or were given the option not to answer).

In this time 934 of the test takers indicated their answers were accurate and suitable for research. The sample is 53% male; average age is 30.0 years; 72.1% saw the dancer spinning clockwise. The differences in their big five personality traits are tabled below.

Trait Average (clockwise) Average (counterclockwise) p
extraversion 3.08 3.07 0.84
conscientiousness 3.32 3.47 0.01
neuroticism 2.98 3.09 0.08
agreeableness 3.89 3.89 1
openness 4.08 4.02 0.22

There was one statistically significant difference (p<0.05), conscientiousness, but its effect size was minor. So, yes, the spinning dancer can serve as an indicator of personality, although an extremely minor one and not in a right-brain left-brain sort of way. The data used for the post can be downloaded for reanalysis here.