Aggression Most psychologists define aggression as behavior with intent to harm or injure.

1. AggressionMost psychologists define aggression as behavior with intent to harm or injure.

2. Maccoby & Jacklin “Fairly well-established gender difference”- For both physical and verbal aggressio - Across cultures - Appeared between 2 and 3 yrs old and continued through college - After that little information available

3. Janet Hyde – 5% of differences can be attributed to gender Age 6 – 7% of variance College Age – 1% of variance

4. Sex Differences in US Crime Statistics

5. Aggression in Pre-School Children

6. Biological Explanations • Testosterone levels • Pre-natal hormones • Serotonin

7. Mice data

8. More Rat data

9. Bird data

10. Human data – Correlation Studies

11. No Correlation – Some studies on men have shown this kind of relationship

12. Correlation studies in Men High Testosterone levels have been correlated with: - History of arrests 2 studies - History of violent crimes 1 study - Less likely to marry, more to divorce, troubled relations 1 study - Aggressive disposition 2 studies - variety of anti-social behavior AWOL, alcohol & drug abuse 1 study

13. CAH Girls Activity Level

14. Serotonin Levels in Violent Suicides

15. Serotonin Reuptake Inhibitor

16. Stereotypes Play

17. Acceptable Male behavior

19. Big Boys Toys

20. Movies

21. Video Games

22. Sports Images

23. International Problem Solving