A new study from the University of Chicago Booth School of Business, New York University and Tilburg University has revealed that people's political affinity can have a bearing on how light or dark they perceive a political candidate to be.
The findings indicate that people perceive lighter skin tone to be more representative of a candidate with whom they share political ideology than darker skin tone.
Led by Eugene Caruso, assistant professor of behavioural science at Chicago Booth, the researchers showed groups of undergraduate students a set of photos of Barack Obama that were taken during the 2008 presidential debates or from his campaign Web site.
The subjects were asked which images were most representative of the president, and then indicated their political beliefs.
While some of the photos were unaltered, the researchers digitally lightened or darkened Obama's skin tone in others (unbeknownst to the research participants).
The researchers report that self-described liberal students tended to judge lightened photos of President Obama as most representative of him, while self-described conservative students more frequently picked darkened photos.
The study also found that regardless of their political views, students who rated a lightened photo as most representative of President Obama before the 2008 presidential election were more likely to report having voted for him in the presidential election.
The findings suggest that people's political beliefs can affect how light or dark they perceive someone to be.
Now, the team is planning to explore whether liberal and conservative media outlets depict subtly different images of political candidates, and whether the specific images to which voters are exposed may influence voting behaviour, said Caruso.
"Subtle differences in a person's skin tone may affect other consequential decisions in which pictures are part of the evaluation process, such as who we hire for a job," said Caruso.
In his opinion, the study suggests that discussion should not only concern how people perceive Blacks versus Whites, but also how perceptions of Blacks or biracial people vary within these groups.
The study was published in the latest issue of Proceedings of the National Academy of Sciences.