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Month: March 2019

Amygdalo-cortical Development and the Emergence of Primate Social Behavior

Posted on March 26, 2019January 11, 2023 by MacBrain research team

A number of studies in non-human primates have suggested that the amygdala is essential for the normal production and interpretation of social signals. Network researchers conducted a study in rhesus monkeys that challenges this long-held belief. Adult monkeys with amygdala lesions appear to demonstrate normal social behavior, while infant monkeys with amygdala lesions in previous studies have demonstrated impairments in social behavior.

However, these abnormalities may not have been attributable to the absence of the amygdala, but may rather have been attributable to abnormal rearing conditions (isolation or peer-rearing) or to additional damage to structures surrounding the amygdala due to less sophisticated lesioning methods than are currently available. This study found that infant rhesus monkeys with very precise lesions of the amygdala who were reared with their mothers did develop species-appropriate social behaviors, indicating that the amygdala is not necessary for normal social development.

However, these animals did produce more …

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Development Of Methods For Studying Brain-behavior Relations

Posted on March 23, 2019January 11, 2023 by MacBrain research team

Methods for Studying Brain-Behavior Relations – Part of the challenge of studying the effects of experience on the brain is the paucity of methods for examining the development of particular brain structures. These research projects focus on the development of methods that will allow us to look at how brain structures thought to be involved in particular aspects of behavioral development change with time and experience.

As interest in the brain increases among those studying behavioral development, the need for basic knowledge about brain development also grows. For those interested in emotional development and temperament, it is crucial to understand the development of the amygdala, a part of the brain that is believed to serve as the “seat” of emotion. The amygdala also plays a prominent role in regulating an individual’s ability to associate rewards with certain behaviors. Finally, the amygdala is critically involved in the recognition and interpretation of …

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