FRONTAL LOBE DAMAGE

They Looked The Same

Same Face. Same Voice. Same Way Of Holding A Coffee Cup

But The People Who Loved Them Used The Same Sentence Within The First Week

That Is Not Him

That Is Not Her

The Body Was Discharged. Something Else Did Not Come Home

You Could Not Explain It Clinically

A Neurologist Could

🧠Back To Damage🧠

The Frontal Lobe Is The Largest Lobe Of The Human Brain

It Sits Directly Behind The Forehead And Extends Back To The Central Sulcus

It Is Also The Last Region Of The Brain To Fully Develop

Myelination Of The Prefrontal Cortex Is Not Complete Until The 20s

Which Is Why Adolescent Decision Making Looks The Way It Does

This Region Houses What Neuroscientists Call Executive Function

Working Memory. Inhibitory Control. Cognitive Flexibility. Goal Directed Behavior

It Is The Part Of The Brain That Holds A Plan In Mind While The World Tries To Pull You Off It

It Is Also The Part That Decides

Whether The Sentence You Are About To Say Is The Sentence You Should Actually Say

When This Region Is Damaged, The Lights Stay On

The Person In The Chair Can Still Speak. Still Walk. Still Recognize Their Family

What Goes Offline Is The Architecture That Decides What To Do With Any Of It

In 1848 A Railroad Foreman Named Phineas Gage

Was Tamping Explosive Powder Into A Borehole In Vermont

The Charge Detonated Early

A Three Foot Iron Rod Entered Beneath His Left Cheekbone

Passed Through The Frontal Lobe, And Exited The Top Of His Skull

He Did Not Die

He Did Not Even Lose Consciousness For Long

His Memory Was Intact. His Language Was Intact

His Motor Function Returned

What Did Not Return Was Phineas Gage

His Physician John Harlow Wrote The Sentence That Founded An Entire Subfield Of Neuroscience

Gage Was No Longer Gage

The Man Who Came Back Was Impulsive

Profane

Unable To Hold A Plan. Unable To Hold A Job

The Damage Was Concentrated In What We Now Call The Ventromedial Prefrontal Cortex

The Region That Integrates Emotion With Decision Making

Before Gage, The Frontal Lobe Was Considered Largely Silent Tissue

After Gage, It Became The Region That Held The Person Together

Frontal Lobe Damage Does Not Produce One Syndrome

It Produces Several

Depending On Which Subregion Takes The Hit

Damage To The Dorsolateral Prefrontal Cortex Disrupts Working Memory And Cognitive Control

The Person Cannot Hold Multiple Pieces Of Information In Mind

Cannot Plan Sequences

Cannot Inhibit A Prepotent Response

Tasks They Used To Do Without Thinking Now Require Effort They Cannot Generate

Damage To The Orbitofrontal Cortex Produces What Clinicians Historically Called Pseudopsychopathy

Disinhibition

Inappropriate Behavior

Loss Of Social Filtering. Emotional Lability

The Person Has Not Become Cruel

The Network That Used To Tell Them What Was Socially Permissible No Longer Sends The Signal

Damage To The Medial Frontal And Anterior Cingulate Regions

Produces What Was Once Called Pseudodepression

Apathy. Abulia

A Near Total Collapse Of Self Initiated Behavior

The Person Is Not Sad

They Are Empty Of The Drive That Sadness Would Require

They Will Sit In A Chair For Hours Because No Internally Generated Signal Tells Them To Do Otherwise

It Is Rarely The Cognitive Test That Reveals The Damage

It Is The Dinner Table

The Person Interrupts

Says Something They Would Have Edited Six Months Ago. Laughs At The Wrong Moment

They Do Not Track The Emotional Tone Of The Room

The Mirror Neuron System And The Mentalizing Network Run Through Frontal Circuitry

When That Circuitry Is Compromised, Theory Of Mind Compresses

The Person Can Still Love You

They Just Cannot Always Read You

The Subtle Pressure That Used To Hold Their Behavior Inside The Norms Of The Relationship

That Pressure Was Generated By The Frontal Lobe

When The Generator Is Offline, The Behavior Drifts

Not Because They Stopped Caring

Because The Neural Substrate That Translated Caring Into Conduct

Is No Longer Producing The Output

Anosognosia Is The Clinical Term

A Lack Of Awareness Of One's Own Deficit

It Is Common In Frontal Lobe Injury And It Is One Of The Cruelest Features Of The Condition

The Same Network That Would Have Monitored Behavior Is The Network That Was Damaged

So The Monitor Cannot See Itself Failing

The Person Believes They Are The Same

The People Around Them Carry The Weight Of Knowing Otherwise

Insight Requires Intact Frontal Function

That Is Not A Philosophical Statement

That Is A Neuroanatomical One

You Cannot Use The Broken Instrument To Measure The Break

The Frontal Lobe Is Plastic, But Not Infinitely

Younger Brains Recover More Function Than Older Ones

Smaller Lesions Recover More Than Larger Ones

Diffuse Axonal Injury From Closed Head Trauma

Can Be Harder To Rehabilitate Than A Focal Stroke In The Same Region

Because The Damage Is Distributed Across White Matter Tracts

Rather Than Concentrated In Gray Matter

Rehabilitation Targets Compensatory Strategies More Than Restoration

External Scaffolding For Working Memory

Behavioral Routines That Bypass The Need For Internal Initiation

Environmental Cues That Substitute For The Lost Inhibitory Signal

The Person May Regain Function

The Pre injury Self Rarely Comes Back Whole

What Returns Is A Reorganized Version Operating With Fewer Of The Tools The Original Was Built Around

The Family Grieves Someone Who Is Still In The Room

That Grief Has A Name In The Literature

Ambiguous Loss

It Is One Of The Most Underdiscussed Costs Of Frontal Lobe Injury