What is one key finding about animals with smaller amygdalae?

• A. They exhibit more social behavior
• B. They have higher aggression levels
• C. They are more prone to anxiety
• D. They show increased cooperation

Answer: (B)

The association between smaller amygdalae and higher aggression levels is supported by research findings in the field of biological psychology. The amygdala is a critical brain structure involved in processing emotions, particularly fear and aggression. Studies on various animal species have indicated that a reduced size of the amygdala correlates with alterations in aggressive behavior.

When considering the pivotal role of the amygdala in regulating emotions, a smaller amygdala may result in less effective emotional processing and regulation, leading to imbalances in how aggression is expressed. In this context, animals with smaller amygdalae may exhibit heightened aggression because they might respond more impulsively or have less capacity to regulate their emotional responses effectively.

Other options regarding social behavior, anxiety, or cooperation dynamics do not align as directly with the established link between amygdala size and aggression, making the connection to higher aggression levels stemming from a smaller amygdala a key finding in understanding the impact of brain structure on behavior.