The Brain's Clock: Understanding Velocity Storage and the Feel of Spin
I recently read a fascinating article by Dr. Jeremy Schmoe, a neurological chiropractor and a leader in functional neurology. His work on the deeper aspects of cerebellar function and velocity storage resonated deeply with my own clinical practice and with the FYZICAL Balance Paradigm. I felt it was incredibly important to share his insights because he so clearly explains why some of our most complex patients feel a persistent spinning sensation long after they stop moving. You can read his article, 'Cracking Velocity Storage: Nodulus–Uvula, Fastigial & the Feel of Spin,' which he published on Substack on September 18, 2025.
You have probably seen it countless times. A patient comes into your clinic and reports feeling like they are still spinning long after they have stopped moving. Or maybe they feel like they are constantly rocking on a boat. These are not just strange sensations; they are key symptoms that point to a breakdown in the brain's most intricate timing system.
As a physical therapist, your role in diagnosing and treating patients with these complaints is crucial. Your ability to identify and address potential problems with their velocity storage is a key part of the solution.
The Cerebellum: More Than Just a Balance Organ
The cerebellum, a marvel of complexity, is responsible for controlling balance, coordination, and posture. However, its role extends far beyond these functions. It acts as the brain's master clock and a predictive engine, constantly processing information from our vestibular system, visual system, and our body’s surfaces to predict our next move and prevent us from falling.
The vestibulocerebellum, a specific part of this organ, governs a mechanism called velocity storage. Think of velocity storage like a clock that times how long a motion signal lasts. When this system works correctly, you spin in a chair, stop, and the sensation of spinning fades quickly. When it malfunctions, the clock gets stuck, and the motion perception lingers long after you stop. This is why you feel the sensation of 'unending spin' or 'rocking.'
Two Sides of the Cerebellar Coin: Posture Versus Perception
When we evaluate a patient with dizziness, it’s not enough to say, 'Their cerebellum is the problem.' We must get more specific. At FYZICAL Therapy & Balance Centers, we look for key distinctions that help us target the correct issue:
Fastigial Nucleus: This part of the cerebellum primarily controls posture and stability. A problem here leads to poor postural control, a wide stance, and truncal instability. We see this when a patient sways or loses their balance with their feet together, especially when they close their eyes. We often observe this as a breakdown in a patient's Somatosensory-Vestibular Mismatch (SVM) and Somatosensory > Vision-Vestibular Mismatch (SVVM) sensory strategy. Their reliance on surface cues is insufficient to compensate for their poor postural control.
Nodulus & Uvula: These parts of the cerebellum regulate velocity storage. When they malfunction, they create motion illusions. This is where you see the prolonged spinning, the persistent rocking, and the feeling of being on a boat. A dysfunction here often forces a patient to rely on a Visual-Vestibular Mismatch (VVM) or Visual>Somatosensory-Vestibular Mismatch (VSVM) strategy, over-relying on visual cues to compensate for their faulty internal perception of motion.
A patient who sways and falls has a different problem from a patient who feels like they are constantly rocking. One is a postural problem, the other is a perceptual one. This distinction helps us develop a precise treatment plan.
Mal de Débarquement Syndrome: When the Clock Gets Stuck
One of the biggest troublemakers I see in my clinical practice is Mal de Débarquement Syndrome (MdDS). It's a condition where patients feel as though they are persistently rocking, swaying, or bobbing, much like they are still on a boat, even when they are on solid ground. This phenomenon perfectly correlates with Dr. Schmoe's description of a dysfunctional velocity storage center.
I find that the velocity storage center is the biggest culprit in my patients with MdDS. The center gets stuck in a persistent, perseverating entrainment. The brain's clock, which should have returned to normal after leaving the motion environment, continues to perceive motion. This miscalibration causes a constant, exhausting feeling of being in motion, which becomes the new normal for the patient's nervous system.
The Solution: Recalibrate the Brain's Clock
When a patient’s cerebellar clock is malfunctioning, we cannot simply fix it with basic balance exercises. We have to retrain the brain's timing networks.
This is where the FYZICAL Balance Paradigm comes into play. We use targeted interventions to recalibrate the systems that are out of sync:
Gravity Retraining: We utilize positional maneuvers and carefully graded drills on our Safety Overhead Support (SOS) system to retrain the brain's perception of gravity. For patients who experience constant rocking, we teach them to rely on their vestibular system again, thereby reducing their dependency on visual or somatosensory cues.
Sensory Integration Drills: Our FYZICAL-CTSIB assessment helps us identify which sensory strategies a patient uses. With this information, we create custom programs that force the brain to reweigh sensory inputs. For example, we might challenge a patient's visual system with Optokinetic Stimulation while they perform balance tasks.
Dual-Task Training: The cerebellum also connects to the brain's frontal lobe, which is responsible for cognitive tasks. When this connection fails, patients experience brain fog and difficulty focusing. We use dual-task training—making a patient balance on an unstable surface while they perform a cognitive task—to repair these crucial pathways and restore their resilience.
Ultimately, when a patient says, 'I still feel like I'm spinning, even when I stop,' we know the answer lies in velocity storage dysfunction. Our job as physical therapists is to recalibrate that system, restoring not only their balance but also their confidence and ability to live without the nagging feel of spin.
About the Author: Brian Werner, PT, MPT
Brian Werner is a physical therapist and the National Director of Vestibular Education & Training at FYZICAL. He developed the Physical Balance Paradigm and has spent over a quarter of a century specializing in the treatment of vestibular and balance disorders. He is a co-founder of FYZICAL, LLC.