Stereotype threat (ST) refers to a situation in which a member of a group fears that her or his performance will validate an existing negative performance stereotype, causing a decrease in performance. For example, reminding women of the stereotype "women are bad at math" causes them to perform more poorly on math questions from the SAT and GRE. Performance deficits can be of several types and be produced by several mechanisms. We show that ST prevents perceptual learning, defined in our task as an increasing rate of search for a target Chinese character in a display of such characters. Displays contained two or four characters and half of these contained a target. Search rate increased across a session of training for a control group of women, but not women under ST. Speeding of search is typically explained in terms of learned "popout" (automatic attraction of attention to a target). Did women under ST learn popout but fail to express it? Following training, the women were shown two colored squares and asked to choose the one with the greater color saturation. Superimposed on the squares were task-irrelevant Chinese characters. For women not trained under ST, the presence of a trained target on one square slowed responding, indicating that training had caused the learning of an attention response to targets. Women trained under ST showed no slowing, indicating that they had not learned such an attention response.A cross all cultures that have been examined there is a persistent stereotype held by both men and women that "women are bad at math." This stereotype is consequential: Women's math achievement and performance is lower in cultures where this stereotype is stronger (1). Although there are many reasons why women underperform at math, one important factor that affects not only math performance but also career choices and career achievement is stereotype threat: The mental and behavioral states that accompany the activation of this stereotype in women (2). Most notably, when this stereotype is activated in women's minds, they worry about confirming this pejorative stereotype and their math performance drops (3-5). Similar findings exist for other performance stereotypes held about other populations (5-7). The reasons for the performance drop are not entirely clear. Perhaps some kind of general anxiety causes a general decrement in women's math performance (8). Stereotype threat (ST) has been shown to increase arousal (9), increase negative thoughts (3, 10), decrease cognitive resources (5), and increase the perseverance of incorrect problem-solving strategies (11-13); all of these reactions partially explain performance decrements. Given the varied negative responses to threat, it seems a natural extrapolation to guess that it might inhibit women's ability to learn new information. That theory is the target of the present research.Demonstrating that ST reduces or inhibits learning is important because it broadens the domain of ST and provides a specific unstudied mechanism by which ST impacts performance. ...