❓ Here’s a question almost nobody in BCI development is asking: what happens to the brain’s energy supply when you implant an electrode?
The brain is the most metabolically demanding organ in the body. It consumes roughly 20% of the body’s energy despite representing only 2% of its mass. That energy is delivered through a dense network of blood vessels, regulated in real time by a system called neurovascular coupling, the mechanism by which active brain regions signal their need for more blood flow and receive it within seconds.
🚧 When an electrode is implanted, this system is disrupted. Vessels are severed or compressed during insertion. Pericytes, the cells that regulate capillary diameter and blood flow, constrict in response to injury. The result is a local reduction in tissue oxygenation around the electrode in the days and weeks following implantation.
🔇 We showed that this deoxygenation has direct consequences for neural activity. Neurons adjacent to the implant are silenced, not because they are dead or damaged in the conventional sense, but because they lack the metabolic resources to sustain activity. When we provided strong direct electrical stimulation, those neurons responded. They were alive. They were just quiet, rationing energy the way any system does when its supply is constrained.
😶 This has a deeply uncomfortable implication for how we interpret BCI recordings. When a researcher or clinician observes decreased neural activity around a chronically implanted electrode, the standard interpretation is neuronal loss. Our data suggest that at least some of what looks like neuronal loss is actually neuronal silence driven by metabolic stress. The neurons are there. They’ve just gone dark.
🩺 The distinction matters enormously for intervention strategy. If neurons are dead, you need to prevent death. If neurons are metabolically suppressed, you potentially need to restore the energy supply, a very different problem with a very different solution.
🔬 This is why my lab has become increasingly focused on oligodendrocytes, pericytes, and the neurovascular system as targets, not just the electrode-tissue interface itself.
Metabolic Stress & Silencing: https://lnkd.in/e6bgMBAt
Review: https://lnkd.in/e7MrVCc7
Pericytes: https://lnkd.in/edzheqNu
Oligo: https://lnkd.in/ePXYRr2C
Metabolic Stress& Silencing2: https://lnkd.in/eZ_7ZsTN
Metabolic Stress3: https://lnkd.in/e8FdNNFw
Review 2: https://lnkd.in/e_giHFkU
#Neuroscience #BrainHealth #Metabolism #BrainComputerInterface #Bioengineering