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Why neurotech is so close to my heart: mind-blot.vercel.app
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marley 📐
173 posts
marley 📐
@_marleyx
I was placed on this earth to spend a couple moments with you •
Joined April 2019
- Can we invent new brain-computer interface modalities? @raffi_hotter and I got 9 friends together and built a lab at home to test two totally new imaging methods: acoustoelectric imaging & functional ultrasound through the skull 🧵 story that involves nV measurements, pretty
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00:00 - .@raffi_hotter and I ran a 2-week hackathon investigating whether you could decode images from a portable brain scanner We got initial results that suggest you can reconstruct images like these from brain activity recorded with time-domain NIRS, and share our detector prototype
- The most cowboy path to BCI: spectral hole burning + ultrasound-modulated optical tomography First apply ultrasound and light: the ultrasound tags photons that pass through a location on the brain with a small (1 MHz) color shift. Then — *cryogenically* cool a crystal to 4 K and
- Replying to @_marleyxWe pursued acoustoelectric imaging and functional ultrasound since, in principle, you can get 1-mm resolution brain readings noninvasively. Compared to EEG, that’s ~10,000x the number of channels!
- Happy holidays! we built a 7 ft tall gingertower. @ansonyuu @upcycledwords @willdepue @raffi_hotter @mehran__jalali @_npfoss @HarshuMusunuri @turboblitzzz @charlesxjyang @viv_boop @yush_g
- Just fixed Curius tonight and it should be available on the Chrome store again soon — sorry to everyone who's been waiting! alas, we've been preoccupied with bci
- Replying to @_marleyxIt was exhilarating to wake up and constantly be thinking about the science, in an airbnb with friends - making our own acoustic lenses out of candle wax, Orbeez, and carved... carrot molds - new levels of jank, duct taping hydrophones to plastic straws - buying 27 gallons of
- Replying to @_marleyxAcoustoelectric imaging (AE) uses a physical phenomenon where ultrasound interacts with electric fields Functional ultrasound was recently shown with the skull removed, but has yet to be shown with the skull intact
- Replying to @_marleyx @protocollabs and 6 othersI never knew science could feel like this: a moment of pure, precious joyteam getting the acoustoelectric effect for the first time (2024)
00:00 - Replying to @_marleyxIn the acoustoelectric effect, ultrasound interacts with electric fields by changing the conductivity of a material. By applying ultrasound to a region, you can isolate signals from that region by looking for modulation at the ultrasound frequency — typically > 500 kHz.
- Replying to @_marleyxWe’re hosting a small demo night in San Francisco this Saturday if you’re interested in the technology! apply here (short form):
- Replying to @_marleyxWe decided to measure it ourselves. Turns out you can buy a human skull online from skullsunlimited.com...
