Racial bias in policing has been a hot-button topic lately, but a Yale study says black people can start facing discrimination as early as preschool.
Teachers watched a short clip of four kids: a black boy, a black girl, a white boy and a white girl. Researchers told them to look for kids acting up, then tracked their eye movements. The educators' eyes went to the black boys for 42 percent of the video.
SEE MORE: Why Fixing Racial Biases Starts With Babies
White boys were looked at second most closely, accounting for 34 percent of the teachers' attention. Both white and black girls were looked at far less, getting 13 and 10 percent of looks, respectively.
One of the study's authors said teachers looking for misbehavior in black students "may explain, in part, why those children are more frequently identified as misbehaving, and hence, why there is a racial disparity in discipline."
But when it came to disciplining the students, white teachers were more lenient with black students. Black teachers, though, punished black students more harshly than white students.
Researchers theorized a different kind of bias came into play for discipline. White educators, as the eye test showed, expected black students to act up more, so they may have had a more lenient standard to match with their lower expectations.
As for the black teachers, the study authors' best guess was that the teachers felt "black children require harsh assessment and discipline to prepare them for a harsh world."