Functional Neurological Disorder: Why Neuropsychological Testing Matters

Functional Neurological Disorder is one of the most misunderstood and under-evaluated conditions in medicine. If you or someone you love has been told their symptoms are "medically unexplained," a neuropsychological assessment may be the missing piece.

What Is Functional Neurological Disorder?

Functional Neurological Disorder (FND) is a condition in which the nervous system fails to send or receive signals correctly, producing real, often disabling neurological symptoms that cannot be explained by structural brain damage alone. It is not the same as malingering or faking. It is not "all in your head" in any dismissive sense. FND involves genuine dysfunction in how the brain processes and transmits information.

Symptoms vary widely and can include non-epileptic seizures (also called functional seizures or PNES), weakness or paralysis, tremor, problems with movement and coordination, speech difficulties, sensory changes, and significant cognitive complaints including memory problems, attention difficulties, and "brain fog."

FND is more common than multiple sclerosis and Parkinson's disease combined. It is frequently encountered in neurology clinics, emergency departments, and rehabilitation settings. And yet it remains chronically underdiagnosed, often misattributed to anxiety or conversion disorder, and frequently met with skepticism rather than clinical curiosity.

Why Testing Gets Complicated

One of the defining features of FND is that standard neurological imaging, such as MRI and CT scans, typically looks normal. This is not evidence that nothing is wrong. It reflects the nature of the disorder: the problem lies in neural network function, not in visible structural damage.

This creates a diagnostic gap that neuropsychological testing is well-positioned to fill. A comprehensive evaluation can document the actual cognitive and functional profile in detail, including:

• •The severity and pattern of memory and attention difficulties
• •Processing speed and executive function deficits that may not be visible on imaging
• •The relationship between cognitive symptoms and emotional factors such as anxiety, depression, and PTSD
• •Symptom validity, which helps distinguish genuine neurological impairment from other contributing factors
• •A baseline for tracking change over time or measuring treatment response

The Overlap with Psychiatric Conditions

FND frequently co-occurs with anxiety disorders, PTSD, depression, and dissociative experiences. This overlap can make diagnosis and treatment planning genuinely complex. It can also lead to a frustrating cycle in which patients are bounced between neurology and psychiatry, with neither specialty feeling fully equipped to address the whole picture.

Neuropsychological assessment bridges this gap. By evaluating cognitive function alongside emotional and psychological factors using validated, standardized measures, a neuropsychologist can help build a complete picture of how the brain and nervous system are functioning, what the emotional contributors look like, and how those factors interact.

This matters enormously for treatment planning. Research consistently shows that FND is most effectively treated with an integrated approach addressing both the neurological and psychological components simultaneously. A good assessment makes that coordination possible.

What a Neuropsychological Evaluation Adds

For people living with FND, one of the most painful experiences is not being believed. Neuropsychological testing provides objective documentation of what is actually happening in the brain. That documentation serves several purposes:

• •Validation: Objective evidence of real cognitive difficulties can be profoundly meaningful after years of being dismissed or disbelieved
• •Differential diagnosis: Ruling out other conditions with similar presentations, such as early dementia, TBI sequelae, epilepsy-related cognitive effects, or primary psychiatric disorders
• •Treatment direction: Identifying which cognitive domains are most affected helps direct rehabilitation, therapy goals, and medical management
• •Disability and legal documentation: Many individuals with FND seek disability accommodations or benefits. A comprehensive evaluation provides the clinical foundation for those applications
• •Monitoring over time: Serial assessments can track whether symptoms are stable, improving, or progressing

A Note on Trauma, Identity, and Care

FND disproportionately affects women, people with histories of trauma, and individuals from marginalized communities. The history of how this condition has been understood, from hysteria in the 19th century to conversion disorder in the 20th, is deeply shaped by gender bias and a tendency to pathologize what clinicians did not understand.

A justice-oriented, trauma-informed evaluation approach takes that history seriously. At AnchorPoint Assessments, we approach FND with genuine curiosity rather than skepticism, with the understanding that your body has been trying to communicate something real, and that you deserve clinicians who take that seriously.