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Neurons communicate in electrical spikes. Brain-computer interfaces intercept those spikes — translating intent into cursor movement, speech, or robotic limb control. The technology is already restoring function in paralyzed patients. What comes after medical applications is the harder question.

Neuroscience maps the machinery. But knowing which neurons fire during grief doesn't explain grief. The discipline has made extraordinary progress on mechanism — and very little on what those mechanisms mean for consciousness, identity, or moral status. That gap is the real frontier.

The motor cortex keeps firing even after the spinal cord is severed. Brain-computer interfaces intercept those signals, decode intended motion, and relay commands to prosthetic limbs or bypass systems — letting paralyzed patients move again, sometimes with startling dexterity.

Neuralink requires drilling through the skull. Synchron's stentrode is deployed endovascularly — through a blood vessel — and parks itself in the motor cortex without a single incision in the brain. It's a radically different bet on how BCIs reach mainstream medicine.

The pitch is seductive: scan a brain, run it on a computer, live forever. The reality is thornier. Mind uploading sits at the collision of neuroscience, philosophy of identity, and raw compute limits.

Cochlear implants work by cheating — skipping the broken biology and speaking directly to the nerve. The device's success rewrote what neuroscience thought was possible about plasticity, and sparked a still-unresolved debate inside Deaf culture.

A prosthetic hand that moves is useful. One that also sends touch signals back to the brain is transformative. By stimulating the somatosensory cortex in precise patterns, researchers have given amputees the ability to feel texture, pressure, and finger location on artificial limbs.