Hardware vs. Software
The most common question patients have is: "If my MRI is normal, how can I be paralyzed?" The answer lies in the difference between Structure and Function.
Structural (e.g. Stroke/MS)
The brain's physical "hardware" is damaged. A wire is cut, a part of the processor is destroyed, or insulation is lost.
- Damage visible on standard MRI
- Symptoms are usually fixed
- Tissue requires physical healing
Functional (FND)
The brain's "software" is malfunctioning. The hardware is perfect, but the signals are being blocked or routed incorrectly.
- MRI scan appears "Normal"
- Symptoms often fluctuate
- System requires "re-training"
Why a "Normal" MRI is frustrated
For many FND patients, a "Normal" MRI report is a source of frustration, making them feel like the doctor thinks they are "making it up." In reality, a normal MRI is good news. It means the brain's pathways are still there and functional—they just need to be reconnected.
The Computer Analogy
"Rule-In" Diagnosis
In the past, FND was a "diagnosis of exclusion"—something doctors called it when they couldn't find anything else. Today, it is a positive diagnosis. Neurologists look for specific signs (like Hoover's sign) that prove the nervous system is intact but malfunctioning.
Key Point
A "functional" problem is just as real and disabling as a "structural" one. The brain is effectively blocking your access to your own body. Recovery is not about "getting over it," but about the hard work of neuro-rehabilitation to fix the software.