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BCI // Reading and Writing to the Brain

Bypass eyes and ears. Read intent from cortex, write signals back. Once medical-only — now an arms race.

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Bypass eyes and ears. Read intent from cortex, write signals back. Once medical-only — now an arms race. Key sections include: BCI / Reading and writing to the brain.; ~ 86 billion neurons. We want to listen.; Listening from outside the skull.; Inside the skull . Closer to the spike.; From thought to cursor . From cortex to words.; Stimulate. The brain interprets.; Neuralink : more channels, robot surgeon.; Synchron . No craniotomy.; Precision Neuroscience . A film, not a needle.; Medical BCI already changes lives..

Key sections

  • 01BCI / Reading and writing to the brain.
  • 02~ 86 billion neurons. We want to listen.
  • 03Listening from outside the skull.
  • 04Inside the skull . Closer to the spike.
  • 05From thought to cursor . From cortex to words.
  • 06Stimulate. The brain interprets.
  • 07Neuralink : more channels, robot surgeon.
  • 08Synchron . No craniotomy.
  • 09Precision Neuroscience . A film, not a needle.
  • 10Medical BCI already changes lives.
  • 11The consumer dreams. Mostly unproven.
  • 12The honest assessment.

Topics covered

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Slide outline
  1. 01BCI / Reading and writing to the brain.
  2. 02~ 86 billion neurons. We want to listen.
  3. 03Listening from outside the skull.
  4. 04Inside the skull . Closer to the spike.
  5. 05From thought to cursor . From cortex to words.
  6. 06Stimulate. The brain interprets.
  7. 07Neuralink : more channels, robot surgeon.
  8. 08Synchron . No craniotomy.
  9. 09Precision Neuroscience . A film, not a needle.
  10. 10Medical BCI already changes lives.
  11. 11The consumer dreams. Mostly unproven.
  12. 12The honest assessment.
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Presentation Transcript

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Slide 01

BCI / Reading and writing to the brain.

  • BCI / 01
  • Bypass eyes and ears. Read intent from cortex, write signals back. Once medical-only — now an arms race.
  • 13 SLIDES // NEURAL INTERFACES // 2026
Slide 02

~86 billion neurons. We want to listen.

  • 02 / THE SIGNAL
  • Each neuron fires action potentials at variable rates — millivolt spikes lasting roughly a millisecond. Cognition emerges from the patterns across populations.
  • Neurons
  • 86,000,000,000
  • cortical + subcortical
  • Synapses
  • ~1014
  • connections per brain
  • Spike width
  • ~1 ms
  • action potential
Slide 03

Listening from outside the skull.

  • 03 / NON-INVASIVE
  • No surgery, no risk — but the bone and scalp blur the signal. You measure populations of millions, not individual neurons.
  • EEG
  • Electrodes on scalp
  • Cheap. ~100 ms temporal, cm spatial. Used in BCI gaming and meditation headsets.
  • fMRI
  • Blood-oxygen MRI
  • ~1 mm spatial — but slow (~seconds). Tracks blood flow, not spikes.
  • MEG
  • Magnetic fields
  • Excellent timing. Requires giant shielded room and superconducting sensors.
  • fNIRS
  • Near-infrared light
  • Portable, measures oxygenation through skull. Limited depth.
  • All four trade fidelity for safety. None will give you a smooth cursor.
Slide 04

Inside the skull. Closer to the spike.

  • 04 / INVASIVE
  • ECoG Grid of electrodes laid on the cortical surface. Used in epilepsy mapping; rich signal without penetrating tissue.
  • Utah arrays ~100 silicon microelectrodes pushed into cortex. Workhorse of academic BCI since the late 1990s.
  • Neuralink threads ~64 flexible polymer threads, 16 electrodes each — placed by a sewing-machine-like robot.
Slide 05

From thought to cursor. From cortex to words.

  • 05 / READING THE BRAIN
  • 2006 // BrainGate
  • Cursor control
  • Matt Nagle, paralyzed from the neck down, moves a computer cursor by imagining hand motion. Utah array in motor cortex. The first proof.
  • 2021+ // Stanford / UCSF
  • Speech decoding
  • Patients with ALS or stroke "speak" via implants reading premotor cortex. Up to ~78 words / minute by 2023; trending toward conversational pace.
  • Reading isn't telepathy. It's measuring intent — the motor signals that would have moved a hand or shaped a sound — and translating them into text or motion.
Slide 06

Stimulate. The brain interprets.

  • 06 / WRITING TO THE BRAIN
  • Send pulses into nerve or cortex, the brain learns to read them as sound, sight, or sensation. Write-mostly BCIs are the oldest commercial neurotech — and the most successful.
  • Cochlear
  • ~700,000
  • implant users worldwide. Stimulates auditory nerve directly.
  • Retinal
  • Early stage
  • Argus II, Prima — phosphene-level vision restored. Argus retired 2020; newer systems advancing.
Slide 07

Neuralink: more channels, robot surgeon.

  • 07 / NEURALINK
  • Founded
  • 2016
  • Musk + neuroscience team
  • Channels
  • 1,024+
  • across 64 polymer threads
  • First human
  • Jan 2024
  • Noland Arbaugh, paralyzed; plays chess by thinking
  • Robot inserts threads thinner than a human hair to avoid blood vessels
  • Wireless, rechargeable, fully under the skull — no protruding hardware
  • Several threads retracted in patient one; software compensated. Real-world feedback in progress.
Slide 08

Synchron. No craniotomy.

  • 08 / SYNCHRON
  • The Stentrode is a mesh of electrodes placed via blood vessels — threaded up the jugular into the superior sagittal sinus, sitting against motor cortex from inside a vein.
  • No drilling, no skull surgery — placed in a few hours like a stent
  • Lower channel count than Neuralink, but lower risk
  • FDA breakthrough device; multi-patient trials in US + Australia
Slide 09

Precision Neuroscience. A film, not a needle.

  • 09 / PRECISION
  • Founded by Neuralink co-founder Ben Rapoport. Lays a thin polyimide film with 1,024 microelectrodes onto the cortical surface — through a slit-like incision, no penetration of brain tissue.
  • Approach
  • Surface film
  • Sits on cortex, like a sticker
  • Channels
  • ~1,024
  • per film, stackable
  • Reversible
  • Removable
  • Non-penetrating; can be replaced
  • Trade-off: ECoG-class signal — not single neurons, but huge spatial coverage. The "safe upgrade" pitch.
Slide 10

Medical BCI already changes lives.

  • 10 / WHAT WORKS
  • Paralysis
  • Movement + cursor
  • Tetraplegic patients control robotic arms, computers, and exoskeletons. Some achieve functional independence with daily-use systems.
  • Speech
  • Restoring voice
  • ALS / locked-in patients regain conversational speech via cortex-to-text decoders. Trending past 70 wpm.
  • Parkinson's DBS
  • ~250,000
  • people with deep brain stimulators. Tremor and rigidity reduced for decades. Approved 1997.
  • Also: epilepsy responsive stimulation, treatment-resistant depression trials, tinnitus suppression. The medical track record is real and growing.
Slide 11

The consumer dreams. Mostly unproven.

  • 11 / SPECULATIVE
  • Memory
  • Hippocampal boost
  • Wake Forest experiments show modest recall improvement via stimulation in epilepsy patients. Generalization unclear.
  • Telepathy
  • Brain-to-brain
  • Lab demos route bits between people via TMS. Bandwidth is laughable. Don't expect mind-DMs soon.
  • AI-cognition
  • Co-processor
  • A chip that "thinks with you." No hardware, no signal-shape, no neuroscience yet supports it. Pure pitch.
  • The gap between "works in a lab on five patients" and "costs $300 at Best Buy" is wider than the marketing suggests.
Slide 12

The honest assessment.

  • 12 / HONEST
  • Two completely different timelines collapsed into one word.
  • Real // Now
  • Medical BCI works. Paralysis, speech, deafness, Parkinson's — measurable wins, multi-decade track record. The science is competitive, well-funded, and shipping.
  • Decades // Off
  • Consumer BCI — meaningful enhancement of a healthy brain — is decades away. Surgery risk, signal density, biocompatibility, and FDA pathways all bind. Don't believe the demo reels.
  • The right framing: BCI is a medical revolution that will eventually spill into consumer use. We are early, and the early stories are the medical ones.
Slide 13

Slide 13

  • 13 / END / REFS
  • The brain is no longer a sealed box. We are listening in — and beginning to talk back.
  • YOUTUBE
  • SEARCH
  • → youtube.com/results?search_query=neuralink+brain+chip
  • → youtube.com/results?search_query=brain+computer+interface+research
  • Companies cited: Neuralink, Synchron, Precision Neuroscience, BrainGate consortium, Medtronic (DBS), Cochlear Ltd. Decoding speech: UCSF / Stanford labs (Chang, Henderson, Shenoy).
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