How Electrical Stimulation Changes Brain Circuits | Functional Neurosurgery Explained – Episode 4

How Electrical Stimulation Changes Brain Circuits | Functional Neurosurgery Explained – Episode 4 When you switch on deep brain stimulation — what actually happens inside the brain? Welcome to Episode 4 of "Functional Neurosurgery, Explained." In this episode, I use S‑T‑N D‑B‑S in Parkinson's disease as a model to trace exactly what a single electrical pulse does — from the axon membrane, to local field potentials, to whole‑network remodelling. This is not a textbook overview. This is a mechanistic framework you can carry into the operating room and the programming clinic. ▶️ In this video you will learn: Why D‑B‑S is not a reversible lesion — and what it actually is What the Volume of Tissue Activated really means, and why you are programming axons not grey matter What pathological beta oscillations are, why they cause bradykinesia and rigidity, and how high‑frequency stimulation disrupts them How the hyperdirect pathway carries antidromic spikes back to motor cortex within milliseconds Why the connectivity profile of your active contact matters more than its coordinates — and what connectomics means for your side‑effect profile Why dorsolateral S‑T‑N and ventromedial S‑T‑N produce completely different clinical outcomes How chronic stimulation induces synaptic plasticity and neurochemical change — and why dystonia takes months to respond The honest answer to the question: do we actually fully understand how D‑B‑S works? By the end, you will have a three‑layer mechanistic framework — fast electrical effects, network remodelling, and plasticity — that explains the clinical timeline of every D‑B‑S response you will ever see. This series is designed for: Medical students and trainees curious about functional neurosurgery Neurology and neurosurgery residents Neuroscience and biomedical engineering students Any clinician who wants to understand the rationale behind D‑B‑S programming I keep the language simple, avoid unnecessary jargon, and focus on clear mental models you can carry with you into clinical practice. 📺 Series roadmap: Episode 1 – Finding 1 mm in the Brain (localisation) Episode 2 – Frames and the Geometry of Precision Episode 3 – Neuromodulation vs. Neuroablation Episode 4 – How Electrical Stimulation Changes Brain Circuits ← You are here Future episodes – Targets, operative workflows, and adaptive D‑B‑S If you find this useful: 👍 Like the video 📝 Leave a comment — tell me which topic you want covered next 🔔 Subscribe to follow the full series Links and resources: https://www.linkedin.com/in/dr-amr-moursi/ #neurosurgery #functionalneurosurgery #DBS #deepbrainstimulation #Parkinsons #neuromodulation #STN #braincircuits #betaoscillations #connectomics #meded #neuroscience #brainstimulation