Agreesion Flashcards
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What role does the limbic system play in aggression?
The limbic system (including the amygdala, hypothalamus, and cingulate gyrus) helps assess threats in the environment. Overactivity in the amygdala is linked to impulsive aggression.
How does serotonin affect aggressive behavior in research and in neural and hormonal mechanisms?
Low serotonin levels reduce self-control, increasing impulsive aggression. Research shows violent offenders with low serotonin struggle with impulse control and sleep issues in research
neural and hormonal though states it has calming affect on brain and increases self control so idfk
What is the relationship between testosterone and aggression?
Testosterone influences aggression by affecting brain activity. Higher testosterone is linked to increased aggression in both animals and humans, while castration studies show reduced aggression.
What research supports the amygdala’s role in aggression?
Gospic et al. (2011) used fMRI scans in a lab-based provocation game. Heightened amygdala activity was associated with aggressive reactions, reduced when benzodiazepines were used.
How does serotonin-increasing medication affect aggression?
Berman et al. (2009) found that participants given paroxetine (a serotonin-enhancing drug) gave fewer electric shocks in a provocation game, suggesting increased serotonin reduces aggression.
How does the prefrontal cortex influence aggression?
The prefrontal cortex regulates emotions and controls impulsive behavior. Damage or underactivity in this area reduces control over aggression, leading to sudden and intense reactions.
What are the two types of aggression linked to serotonin levels?
Impulsive aggression (hot-tempered, sudden) is linked to low serotonin, while non-impulsive aggression (cold, calculated) is less affected by serotonin levels.
Why are males generally more aggressive than females?
Higher testosterone levels in males contribute to increased aggression. Studies show that fluctuating testosterone, such as during puberty, correlates with aggression levels.
What research supports the link between testosterone and aggression?
Animal studies show that castrating males reduces aggression, while injecting testosterone increases it. Similar patterns have been observed in humans.
How can understanding neural and hormonal mechanisms help manage aggression?
Medications that regulate serotonin (e.g., SSRIs) can reduce aggression, and therapies targeting impulse control help manage aggressive tendencies.
what does the limbic system do? (neural and hormonal)
The limbic system regulates emotions, including aggression.
Key structures: amygdala, hypothalamus, and cingulate gyrus.
The amygdala is responsible for processing threats and triggering aggressive responses.
Overactive amygdala → leads to higher aggression.
Supporting Research on the Amygdala (neural and hormonal)
Gospic et al. (2011):
Used fMRI scans during a provocation-based game.
Found heightened amygdala activity in aggressive reactions.
Participants given benzodiazepines (which reduce arousal) showed lower aggression and amygdala activity.
Limiting Research on the Amygdala neural and hormonal)
Coccaro et al. (2007):
Found reduced orbitofrontal cortex (OFC) activity in aggressive individuals.
Suggests that aggression is not solely due to the amygdala, but also involves higher brain areas responsible for self-control.
The Role of the Prefrontal Cortex (neural and hormonal)
The prefrontal cortex regulates impulse control and decision-making.
Low prefrontal cortex activity → increases aggressive behavior.
Violent offenders often show reduced prefrontal activity, suggesting poor emotional regulation.
The Role of Serotonin in Aggression (neural and hormonal)
Serotonin is a neurotransmitter that has an inhibitory effect on aggression.
Low serotonin levels → linked to poor impulse control and increased aggression.
The orbitofrontal cortex is particularly affected by serotonin levels.
Supporting Research on Serotonin
Berman et al. (2009):
Participants given paroxetine (a serotonin-enhancing drug) showed lower aggression in response to provocation.
Those given a placebo were more aggressive, supporting the serotonin-deficiency hypothesis.
Biological Evidence for Serotonin-Aggression Link
Virkkunen et al. (1994):
Found low serotonin metabolite levels in violent impulsive offenders.
These offenders also had more difficulty sleeping, suggesting a hyperactive nervous system.
Challenges to the Serotonin-Aggression Link
Some animal studies show that serotonin depletion does not always increase aggression.
Personality and environmental factors may influence serotonin’s effect.
Serotonin-Based Treatments for Aggression
Selective Serotonin Reuptake Inhibitors (SSRIs), like fluoxetine, are used to reduce aggressive outbursts in individuals with impulse control disorders.
Interaction of Serotonin and the Limbic System
Serotonin modulates activity in the amygdala, preventing overreactive responses to threats.
Low serotonin → hyperactive amygdala → higher aggression.
Role of Testosterone in Aggression
Testosterone is a male sex hormone linked to aggression and dominance behaviors.
Higher testosterone levels are correlated with increased aggression in both animals and humans.
Supporting Research on Testosterone in humans
Dabbs et al. (1995):
Measured testosterone levels in prison inmates.
Inmates with higher testosterone were more likely to have committed violent crimes.
Alternative Explanation: Dual-Hormone Hypothesis
Carre & Mehta (2011):
Testosterone’s effect on aggression depends on cortisol levels.
High testosterone only leads to aggression when cortisol is low.
Suggests hormonal interactions, rather than testosterone alone, determine aggression.
Animal Studies on Testosterone
Castration studies show that removing testosterone reduces aggression.
Reintroducing testosterone restores aggressive behavior, supporting its role.