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Stereotype threat-a situational context in which individuals are concerned about confirming a negative stereotype-is often shown to impact test performance, with one hypothesized mechanism being that cognitive resources are temporarily co-opted by intrusive thoughts and worries, leading individuals to underperform despite high content knowledge and ability (see Schmader & Beilock, ). We test here whether stereotype threat may also impact initial student learning and knowledge formation when experienced prior to instruction. Predominantly African American fifth-grade students provided either their race or the date before a videotaped, conceptually demanding mathematics lesson. Students who gave their race retained less learning over time, enjoyed the lesson less, reported a diminished desire to learn more, and were less likely to choose to engage in an optional math activity. The detrimental impact was greatest among students with high baseline cognitive resources. While stereotype threat has been well documented to harm test performance, the finding that effects extend to initial learning suggests that stereotype threat's contribution to achievement gaps may be greatly underestimated.

Negative relationships between mathematics anxiety and achievement appear in many countries globally (Lee, 2009; OECD, 2013), suggesting that mathematics anxiety could be an underconsidered factor in regions with persistently low mathematics achievement. We draw on a national sample of students and their teachers in Belize to examine relations between mathematics anxiety and achievement. The data replicated the negative relationships between students' math anxiety and achievement observed in many higher achieving, higher resourced regions, and importantly also revealed that teachers' mathematics anxiety predicted their students' mathematics attitudes and sometimes achievement. The effects were small overall so the robustness of this relationship is not clear, but they provide novel data toward building a comprehensive theory of mathematics anxiety's relationship to achievement across cultural, gender and age contexts, and offer insight into how addressing mathematics anxiety might improve mathematics teaching and achievement in low resourced countries. Mathematical proficiency is a global area of concern, and improving the efficacy of mathematics education is viewed by many as a key to increasing nations' successful participation in the global economy. In light of the growing

Gender gaps in mathematics achievement persist in many contexts and when visible, these gaps are paradoxical. Low-stakes measures of mathematics achievement such as grades and study behaviors favor girls, while gaps tend to reverse on assessments/competitions. We explore whether different impacts of raising performance stakes could be one explanation. Study 1 experimentally manipulated the stakes by imposing a performance-contingent, social-evaluative pressure either: before instruction (n = 66), before testing (n = 61), or none (n = 54). Pressure, particularly when experienced during instruction, reduced learning among girls. In contrast, boys trended toward enhanced learning under pressure. In the absence of pressure, girls exhibited strikingly larger gains in learning. Study 2 drew from a larger dataset (n = 386) to interrogate whether girls' superior learning in the no-pressure context might simply be an artifact of differences in prior knowledge, cognitive resources, or demographic variables, but the effect replicated and was not explained by these factors.Men and women do not differ meaningfully in mathematics aptitude (see Spelke, 2005