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Lecture 7

PSYC12H3 Lecture 7: PSYC12 - Lecture 7

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Michael Inzlicht

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PSYC12: Lec. 7 – Stereotype Threat I GROUP DIFFERENCES IN MEASUREMENT OF INTELLECTUAL PERFORMANCE ▪ Major & O’Brien, 2005 ▪ Male-Famale Math Performance Differences ▪ Black-White IQ Distribution Ask Yourself: ▪ Ask yourself about group differences in “intellectual performance” ▪ Race: Black-White IQ difference ▪ Sex: Male-Female math difference ▪ SES: Rich-Poor IQ difference ▪ Why are groups different? Origins of Intelligence: ▪ Nature? Nurture? Genetics: ▪ Intelligence is highly heritable ▪ High correlation between parent IQ and child IQ ▪ IQ of identical twins is highly related; more than fraternals ▪ IQ of identical twins reared apart is highly related ▪ IQ of adopted children is related to IQ of biological mother, less related to IQ of adopted mother Environment: ▪ Environment also plays role ▪ IQ of identical twins reared apart is less related than IQ of identical twins reared together ▪ IQ of fraternal twins is more strongly related than IQ of regular siblings ▪ IQ of adopted children is more similar than unrelated individuals reared apart ▪ Impoverished environments related to lower IQ Nature vs. Nurtue? ▪ Both Nature and Nurture contribute to intelligence ▪ But genetics certainly play role ▪ Heritability index = 0.50 (may be as high as 0.65) ▪ If within-group difference has genetic component, perhaps between-group difference has genetic component too. ▪ No. Between-group differences may be caused by different factors than within- group difference ▪ Why are groups different? ▪ Different socializing environments Does the Difference Exist? ▪ “Intellectual performance” (whether biased or not) reveal robust differences. ▪ BUT: ▪ What does this difference mean? Are the Tests Unfair? ▪ The tests are culturally biased ▪ External Bias ▪ Internal Bias Environment: ▪ SES and IQ are positively related ▪ If groups are over-represented in low SES, will also be over-represented in low IQ ▪ Match Black-White environment: ▪ Black children adopted by White parents have higher IQ than non-adopted Blacks ▪ Difference in Black/White IQ diminished when socioeconomic status is matched Resolution: ▪ When tests culturally “matched,” Black-White gap diminishes ▪ W
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