20. Aggression IV | Summary and Q&A

February 1, 2011
YouTube video player
20. Aggression IV

Install to Summarize YouTube Videos and Get Transcripts


In this video, the lecturer discusses aggression, competition, and their relationship to early hormonal exposure and genes. He explores the effects of prenatal hormonal exposure on aggression in animals and humans and examines the role of genes in aggressive behavior. The lecturer also discusses cultural and ecological factors that contribute to aggression and violence in different societies. He concludes by discussing the profile of individuals involved in terrorism and the challenges in understanding their motivations.

Questions & Answers

Q: What is the difference between organizational and activational hormonal effects?

Organizational hormonal effects occur early in life and set up the nervous system to respond to activational hormonal effects later on. Organizational effects can lead to long-lasting changes in behavior, while activational effects are transient and dependent on the presence of specific hormones.

Q: What are the effects of prenatal hormonal exposure on aggression in females?

In animal studies, females that were exposed to high levels of testosterone prenatally exhibited masculinized behavior, with increased levels of aggression. They displayed more aggressive play, less maternal behavior, and responded to low levels of testosterone with increased aggression. However, the effects of prenatal hormone exposure on aggression in humans are less clear.

Q: What is the relationship between prenatal hormonal exposure and aggression in humans?

Studies on individuals with congenital adrenal hyperplasia and exposure to diethylstilbestrol have shown mixed results in terms of aggression. While some studies initially suggested a link between prenatal hormone exposure and increased aggression in females, subsequent research has questioned these findings and highlighted confounding variables such as surgical intervention or societal perceptions of assertiveness as aggression.

Q: Are there genetic factors associated with aggression?

Yes, genes have been implicated in aggression. Research has identified genes related to neurotransmitters such as serotonin and dopamine, as well as genes associated with impulsivity and pain sensitivity. However, the relationship between genes and aggression is complex, and gene-environment interactions play a significant role in determining behavior.

Q: How do ecosystems and cultural factors influence aggression?

Nomadic pastoralist cultures, which tend to live in deserts, have higher rates of violence compared to other societies. These cultures often have warrior classes and engage in raiding and warfare. Additionally, cultures with strong ideologies and myths of victimization coupled with a focus on retribution are more prone to aggression. Levels of trust, social capital, and cultural norms also influence aggression within societies.

Q: What are some characteristics of individuals involved in terrorism?

The profile of terrorists has evolved over time, with recent Middle Eastern fundamentalist terrorists having different characteristics compared to past profiles. Contemporary terrorists tend to be educated, middle-class individuals in their thirties and forties, with no direct experience of the persecution they are fighting against. This profile challenges traditional interpretations of terrorism, and the motivations behind these individuals' actions are not well understood.


Understanding the relationship between hormones, genes, culture, and ecology is essential in comprehending aggressive behavior. While prenatal hormonal exposure can influence aggressive behavior in animals, its effects in humans are more complex and influenced by social factors. Genes play a role in aggression, but their impact is mediated by the environment. Cultural factors such as past victimization, ideology, and social capital also contribute to aggression. The profile of individuals involved in terrorism is changing, and new factors, such as education and lack of direct experience of persecution, need to be considered in understanding their motivations.

Share This Summary 📚

Summarize YouTube Videos and Get Video Transcripts with 1-Click

Download browser extensions on:

Explore More Summaries from Stanford 📚

Summarize YouTube Videos and Get Video Transcripts with 1-Click

Download browser extensions on: