Yale Journal of Biology and Medicine Stress and the Prefrontal Cortex: An Interview with Dr. Amy Arnsten
Nov 20, 2024
Amy Arnsten, neuroscientist known for uncovering prefrontal cortex mechanisms and developing guanfacine, discusses how stress disrupts executive function. She explains dynamic network connectivity, receptor shifts that shut down prefrontal circuits, and guanfacine's therapeutic action. She also covers aging-related prefrontal decline and lifestyle steps like exercise and diet to help protect cognition.
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Personal Origin Story Driving Neuroscience Career
- Amy Arnsten decided to become a neuroscientist after contrasting compassionate cardiac care for her father with stigma-filled treatment of her aunt's depression.
- That teenage experience drove her lifelong focus on revealing brain mechanisms to reduce stigma and improve psychiatric treatment.
Prefrontal Cortex Is The Brain's Mental Sketchpad
- The prefrontal cortex creates internal mental representations and sustains them over seconds to enable working memory, abstract thought, and top-down emotional control.
- Amy Arnsten emphasizes PFC is energy-intensive and central to impulse control and antidepressant-like regulation of emotion.
Dynamic Network Connectivity Enables Flexible Thought
- Dynamic network connectivity is rapid, reversible weakening or strengthening of PFC synapses via opening/closing potassium channels, enabling flexible thought and coordination with arousal.
- It differs from LTP because it prioritizes fluidity over durable synaptic changes for working memory.