I. Overview and a Historical Perspective

2. Jeffrey Gray's Contributions to Theories of Anxiety, Personality, and Psychopathology, Don C. Fowles

II. Studies of Extraversion and Related Traits

3. Biosocial Bases of Sensation Seeking, Marvin Zuckerman

4. Interpersonal Behavior and the Structure of Personality: Neurobehavioral Foundation of Agentic Extraversion and Affiliation, Richard A. Depue

5. Genomic Imaging of Extraversion, Turhan Canli

6. Neural Substrates for Emotional Traits?: The Case of Extraversion, Brian Knutson and Jamil Bhanji

7. Mapping the Neural Correlates of Dimensions of Personality, Emotion, and Motivation, John D. Herrington, Nancy S. Koven, Gregory A. Miller, and Wendy Heller

III. Age and Sex as Determinants of Individual Differences

8. The Affective Neuroscience of Aging and Its Implications for Cognition, Marisa Knight and Mara Mather

9. Sex Differences in Neural Responses to Sexual Stimuli in Humans, Stephan Hamann

10. Sex Differences in Brain Functional Magnetic Resonance Imaging Response to Stress, Rajita Sinha

IV. Genetic and Neural Analyses of Anxiety-Related Traits

11. Neuroticism as a Genetic Marker for Mood and Anxiety, Nathan A. Gillespie and Nicholas G. Martin

12. The Association of Personality with Anxious and Depressive Psychopathology, Christel M. Middeldorp, Danielle C. Cath, Mireille van den Berg, A. Leo Beem, Richard van Dyck, and Dorret I. Boomsma

13. 5-HT1A Receptor and Anxiety-Related Traits: Pharmacology, Genetics, and Imaging, Klaus-Peter Lesch and Turhan Canli

14. Genetically Driven Variation in Serotonin Function: Impact on Amygdala Reactivity and Individual Differences in Fearful and Anxious Personality, Ahmad R. Hariri

V. Individual Differences in Children

15. Etiology of Psychopathic Tendencies in Children: Distinguishing a Genetically Vulnerable Subgroup of Children with Antisocial Behavior, Essi Viding and Robert Plomin

16. A Cognitive-Behavioral Genetic Approach to Emotional Development in Childhood and Adolescence, Jennifer Y. F. Lau and Thalia C. Eley

17. Cognitive and Biological Functioning in Children at Risk for Depression, Ian H. Gotlib, Jutta Joormann, Kelly L. Minor, and Rebecca E. Cooney

VI. Personality in Animals

18. Using Mouse Models to Unravel Aggressive Behavior, Silvana Chiavegatto

19. Searching for Genetic and Environment Contributions to Personality and Happiness in Chimpanzees (Pan troglodytes), Alexander Weiss and James E. King

20. How Can Animal Studies Contribute to Research on the Biological Bases of Personality?, Pranjal H. Mehta and Samuel D. Gosling