Understanding Sensory Overload After Brain Inflammation or Injury

This extreme sensitivity to light (photophobia) and sound (phonophobia) is more than discomfort — it’s a sign that the brain’s sensory filters are under strain.

What Happens Inside the Brain

Deep within the brain lies the thalamus, part of the diencephalon, which acts like a relay station. It filters every signal — every flicker of light, every sound, every movement — deciding what deserves attention and what can be tuned out.

When the brain is affected by inflammation, injury, or toxic exposure, this system can lose control. The thalamus becomes overstimulated, letting in too much information all at once. The result is what many describe as a “tsunami of stimuli.”

The Role of the Cerebellum and GABA

The cerebellum, sometimes called the “small brain,” is crucial for keeping sensory experiences balanced. It helps the nervous system decide what’s safe to ignore and what needs focus.

If the cerebellum is weakened — for example, after viral inflammation (such as Post-COVID), toxic stress, or trauma — it may fail to calm sensory flow. This happens partly because of a shortage of GABA (gamma-aminobutyric acid), a neurotransmitter that works like the brain’s natural brake pedal.

Without enough GABA, neurons stay in a constant state of alert. The result is thalamic overstimulation — too much input reaching conscious awareness. Lights feel too bright, sounds too sharp, and mental focus becomes difficult.

Why This Is a Neurological Response — Not Psychological

These symptoms are not “in your head.” They are a real neurophysiological response to how the brain processes sensory input under stress or injury. When inhibitory systems fail, the brain struggles to protect itself, and the world becomes painfully intense.

Innovative Support from FNI Lisse

To help people regain comfort and confidence, the Functional Neurology Institute (FNI) in Lisse has developed high-quality sensory filter glasses and precision ear plugs.

These tools are specifically designed to dampen excessive light and sound, reducing the strain on the thalamus and supporting calmer sensory integration. Many individuals find these aids make it possible to re-enter bright or noisy environments — a vital step toward recovery.

Healing and Hope

Living with sensory overload can make everyday life feel unpredictable. Activities like shopping, socializing, or attending events may require pacing and environmental adjustments.

But with understanding, targeted therapies, and support tools such as those from FNI Lisse, recovery is possible. As the brain re-establishes balance — rebuilding GABA levels, restoring cerebellar control, and calming the thalamus — the world can gradually become comfortable again.

The Functional Neurology Institute (FNI) – Lisse combines neuroscience, rehabilitation, and practical sensory support to help individuals restore balance and regain quality of life.