Scientists have developed a brain scan that can purportedly identify racists.

The technique was used on white volunteers shown photographs of black individuals. In those with racist tendencies, a surge of activity was seen in part of the brain that controls thoughts and behavior. Scientists believe this reflected volunteers’ attempts to curb their latent racism.

“To my knowledge, this is the first study to use brain imaging data in tandem with more standard behavioral data to test a social psychological theory,” said researcher Dr. Jennifer Richeso.