Prefrontal cortex

The prefrontal cortex (PFC) is an important part of the brain that sits at the very front of the frontal lobe. It plays a big role in helping us think, decide, and behave in smart ways. This special area helps us focus, control our actions, and make choices that help us reach our goals.

Made up of several areas called Brodmann areas like BA8, BA9, and others, the PFC is involved in many complex brain functions. It helps us form words (Broca's area), control where we look (frontal eye fields), remember things temporarily (dorsolateral prefrontal cortex), and think about risks (ventromedial prefrontal cortex).

This part of the brain is key for what experts call "executive functions." These are skills we use every day, such as planning, making decisions, remembering things we need to do (working memory), and controlling our behavior in social situations. The PFC helps us think through different ideas, choose what is best, and control impulses so we act in ways that are appropriate and helpful.

Structure

The prefrontal cortex is the front part of the frontal lobe in the brain. It helps us think and change our thinking to meet different goals and situations. Scientists define it in three main ways.

One way is based on its structure, called the granular frontal cortex. Another way looks at how it connects to a specific part of the brain called the thalamus. A third way is based on areas where electrical stimulation does not cause movement.

The prefrontal cortex can be divided into different parts. The ventromedial prefrontal cortex includes areas involved in emotions, while the lateral prefrontal cortex includes areas important for thinking and planning. These parts help us with memory, language, and connecting with others.

Function

The prefrontal cortex is the front part of the brain's frontal lobe and plays a key role in helping us plan, decide, and control our actions. It helps us think about things that are not right in front of us and guides our thoughts, actions, and feelings. This area of the brain is important for what scientists call "executive functions," such as remembering information, being flexible in our thinking, and stopping ourselves from doing things we shouldn't.

The prefrontal cortex works with other parts of the brain to help us focus, remember things for short periods, and produce speech. It helps us sort information and change our plans when needed. For example, when we play games that involve changing rules, this part of the brain helps us adjust. It is also important for our memory and attention, helping us keep information in mind and focus on what we need to.

Clinical significance

Brain imaging has helped scientists study the prefrontal cortex and its connections to other parts of the brain. Research shows that people with certain mental disorders, stress, or exposure to harmful substances may have changes in this area. The prefrontal cortex helps us understand right from wrong and see the world clearly.

Regular exercise can strengthen connections in the prefrontal cortex, helping the brain work better. However, long-term alcohol use can harm this important part of the brain, affecting how we make decisions.

History

The story of Phineas Gage helps us understand the prefrontal cortex. In 1848, an iron rod went through Gage’s head, damaging his left frontal lobe. Though he kept his memory, speech, and motor skills, his personality changed. He became irritable and impatient, very different from his past self. This shows how the prefrontal cortex helps control our behavior and emotions.

Studies with people who have injuries in this area reveal that they know what the right social actions are, but they often choose actions that give quick rewards even when these choices lead to worse outcomes later. This tells us that the prefrontal cortex helps us think about the future and choose better long-term rewards over immediate ones. Scientists are researching how to support the prefrontal cortex with medicines like guanfacine.

Etymology

The word “prefrontal” to describe this part of the brain was first used by Richard Owen in 1868. He picked this name because it is located at the very front of the frontal lobe, similar to the prefrontal bone in some animals.

Additional images

Here are some visual representations of the prefrontal cortex:

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  Animation, prefrontal cortex of left cerebral hemisphere (shown in red)

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  Front view

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  Lateral view

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  Medial perspective