Brain and Behavior

Frontal Control of the Limbic System

What happens when the frontal lobe deteriorates?

When the frontal lobe deteriorates, we can see re-emergence of more primitive behaviors that had previously been inhibited by the frontal lobe. The Babinski reflex and frontal release signs are examples of this. Likewise, there is less control over primitive limbic responses. Consequently, the person loses social judgment, impulse control, and the ability to plan and to analyze situations effectively. This is why people with Alzheimer’s disease or other dementias need continuous supervision. When the frontal lobe goes, the person in effect regresses to childhood.


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