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10 cards from this deck
Manipulative behaviors: spreading rumors, withdrawing friendship
2005
Determine genetic vs environmental causes of social aggression
MZ (monozygotic) & DZ (dizygotic)
Teachers and classmates/peers
MZ much higher than DZ - suggests genetic cause
Roughly equal in MZ & DZ - suggests environmental cause
Physical aggression leads to social, not vice versa
Multiple sources (teachers & peers) validates findings
Small size & age-specific (6 yrs), limits generalisability
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