ch9
Chapter 9: Intelligence
Defining Intelligence
Intelligence lacks a clear definition; it involves terms like judge, understand, and rational thinking.
No universal definition exists.
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Spearman’s Psychometric Approach: The g Factor
Spearman proposed the existence of a general ability (g) in addition to specific abilities (s).
Intelligence is a general ability combined with various specific abilities.
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Explanations for g
G corresponds to an underlying ability affecting multiple intelligence types (e.g., mental speed).
Performance on various tests indicates common cognitive skills.
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Hierarchical Models of Intelligence
Fluid intelligence: Problem-solving and reasoning skills; peaks by age 20.
Crystallized intelligence: Knowledge acquisition; peaks in middle adulthood.
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Gardner’s Theory of Multiple Intelligences (1 of 2)
Howard Gardner proposes differing, independent intelligence forms.
Intelligence manifests variably, reliant on individual skills.
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Gardner’s Theory of Multiple Intelligences (2 of 2)
Forms of intelligence include:
Linguistic
Musical
Logical-mathematical
Spatial
Bodily-kinesthetic
Interpersonal
Intrapersonal
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Discussion Activity 1
Engage in class discussions about agreeability with Gardner's theory and measurement methods for multiple intelligences.
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IQ Tests (1 of 2)
Distinction between aptitude (fluid intelligence) and achievement (crystallized intelligence).
IQ tests aim to predict performance in academic settings.
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IQ Tests (2 of 2)
Stanford-Binet Test: Provides overall IQ and specific skill subscores.
Wechsler Tests: Addresses strengths/weaknesses and maintains consistent scoring distribution.
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Culture-Reduced Testing
Progressive Matrices: Measures abstract reasoning without language bias.
Benefit: Fairer for non-native speakers; drawback: lacks strength/weakness insights.
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Activity: Jigsaw
Collaborative exercises to engage with material through peer comparison.
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Individual Differences in IQ Scores
Study correlations of IQ scores among populations with varying genetic relationships:
Identical twins show high correlation (0.85).
Factors influencing resemblance include shared environments and upbringing.
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Gene Identification
Genetic variations minorly correlate with intelligence measures; collective gene impacts are significant.
Epigenetic influences affect how intelligence manifests.
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Environmental Influences
Intellectual development factors include health, education, and disease prevention.
Early interventions enhance cognitive growth.
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Brain Size and Intelligence
Larger brains show a correlation with higher intelligence across humans; women optimize brain structure.
Number of neurons remains similar between genders.
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Discussion Activity 2
Group discussions on genetic influences on intelligence and environmental impacts on siblings.
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Unit 2: Evaluating Intelligence Tests.
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Standardizing IQ Tests
Standardization encompasses evaluating questions, setting rules, and interpreting scores.
Norms: Frequency descriptions of score outcomes.
Standard deviation: Measures individual variance around the mean.
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The Distribution of IQ Scores
Mean IQ ~ 100 with standard deviation ~ 15-16.
Classifications: Mentally challenged (below -2 SD); gifted (130+).
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The Flynn Effect
Performance on IQ tests shows generational increases of ~3 points per decade.
Possible reasons include educational improvement and health advancements.
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Discussion Activity 3
Class exploration of whether IQ increases imply intelligence increase, relevance for lower scores, and the Flynn effect implications on intelligence measurements.
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Evaluating Tests Reliability and Validity
Reliability: Consistency of test results (calculated via correlation).
Validity: Degree of accuracy in what the test claims to measure.
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Interpreting Fluctuations in Scores
Score fluctuations occur due to reliability issues, especially in infants.
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Measuring Test Bias
Bias may distort performance assessments; important to ensure equal predictive accuracy across groups.
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Stereotype Threat
Defined as the risk of confirming negative stereotypes in performance.
Strategies to mitigate stereotype threat.
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Self-Assessment
Consider comparatives between Spearman’s g factor and Gardner’s theory.
Explore standardization, reliability, and validity definitions and implications for the Flynn effect.
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Summary (1 of 2)
Mastery expectations include understanding g and its evidence, as well as distinguishing intelligence types, IQ tests, and influences on intellectual development.
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Summary (2 of 2)
Further knowledge expectations include definitions related to test standardization, the Flynn effect, test reliability/validity, test bias, and stereotype threat understanding.