I think there are studies that showed if children received messaging about their "inferiority" (in one sense or another) before taking a test, they did worse.
[Edit: Ah! The term is "Stereotype Threat": https://en.wikipedia.org/wiki/Stereotype_threat]
This article was more about the effect of teacher bias in education, however I think there is a study showing bias having a cognitive effect on how students perform.
"The impact of unconscious teacher bias is long understood and well-documented. This new research confirms decades of work done by Myra and David Sadker and Karen R. Zittleman. Through thousands of hours of classroom observations, the Sadkers and Zittleman identified specific ways in which implicit and stereotypical ideas about gender govern classroom dynamics. They, as others have, found that teachers spend up to two thirds of their time talking to male students; they also are more likely to interrupt girls but allow boys to talk over them. Teachers also tend to acknowledge girls but praise and encourage boys. They spend more time prompting boys to seek deeper answers while rewarding girls for being quiet. Boys are also more frequently called to the front of the class for demonstrations. When teachers ask questions, they direct their gaze towards boys more often, especially when the questions are open-ended. Biases such as these are at the root of why the United States has one of the world’s largest gender gaps in math and science performance. Until they view their videotaped interactions, teachers believe they are being balanced in their exchanges.
The two reports released last week were focused on girls. However, the same biases have been implicated in teachers unconsciously undermining boys’ interest in the arts and language, enabling harmful gender gaps in self-regulation, and tacitly accepting certain male students’ propensity to believe that studying is “for girls” – all factors that contribute to boys’ lower academic performance."
This article was more about the effect of teacher bias in education, however I think there is a study showing bias having a cognitive effect on how students perform.
http://time.com/3705454/teachers-biases-girls-education/
"The impact of unconscious teacher bias is long understood and well-documented. This new research confirms decades of work done by Myra and David Sadker and Karen R. Zittleman. Through thousands of hours of classroom observations, the Sadkers and Zittleman identified specific ways in which implicit and stereotypical ideas about gender govern classroom dynamics. They, as others have, found that teachers spend up to two thirds of their time talking to male students; they also are more likely to interrupt girls but allow boys to talk over them. Teachers also tend to acknowledge girls but praise and encourage boys. They spend more time prompting boys to seek deeper answers while rewarding girls for being quiet. Boys are also more frequently called to the front of the class for demonstrations. When teachers ask questions, they direct their gaze towards boys more often, especially when the questions are open-ended. Biases such as these are at the root of why the United States has one of the world’s largest gender gaps in math and science performance. Until they view their videotaped interactions, teachers believe they are being balanced in their exchanges.
The two reports released last week were focused on girls. However, the same biases have been implicated in teachers unconsciously undermining boys’ interest in the arts and language, enabling harmful gender gaps in self-regulation, and tacitly accepting certain male students’ propensity to believe that studying is “for girls” – all factors that contribute to boys’ lower academic performance."