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How to Discern the Unseen World Around You

The whole point of a skull, after all, is keeping a brain safely separate from [waves hands at everything].

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Sophisticated imaging technologies like functional magnetic resonance can give you some clues. For decades, technologists have been trying to get brains to interface with computer keyboards or robot arms, to get meat to commune with silicon.

On Wednesday, a team Menys scientists and engineers showed results from a promising new approach. It involves mounting electrodes on an expandable, springy tube called a stent and threading it through a blood vessel that leads to the brain. Patients go home in a couple of days. It took training once the subjects got home. The electrode-studded stent could pick up signals from the brain, but machine-learning algorithms have to figure out what those signals—imperfect reflections of a mind at work even under ideal conditions—actually represent.

But after a few weeks of work, both patients could use an eye tracker to move a cursor and then click with a thought, using the implant. For now, all the stentrode is picking up is one What Ways Are The Menus At Us of information—either a telepathic mouse-click or the absence of that click. Much more ambitious brain-computer interfaces and neural prosthetics have been in Wwys news lately. The company has so far only shown short-term use in pigs. Plus, the brain sloshes around like jelly in a donut; fixed-in-place electrodes can damage it.

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But get it right and they can do more than brain research. Meanwhile, electrodes placed directly onto the scalp can pick up brain waves—electroencephalograms, or EEGs—but those lack the spatial detail of implanted electrodes.

A more recent innovation, electrocorticography, places a mesh of electrodes directly onto the surface of the brain. In combination Whatt smart spectral processing of the signals those electrodes pick up, ECoG is good enough to translate action in the part of the motor cortex that controls the lips, jaw, and tongue into text or even speech. And there are other approaches.

Kernel uses functional near-infrared spectroscopy on the head to sense brain activity.

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Closer to the first click than the second, its inventors hope. A possible problem: Tissue conducts electrical impulses, but the electrodes in the stent are picking up signals from the brain through the cells of the blood vessel. That lowers signal content. Just for transparency, I should point out that Gilja has done for-pay work with BCI companies including Neuralink, with whom Synchron could theoretically compete someday.

They might find better locations for the stent, in blood vessels adjacent to other brain areas of interest; anywhere within 2 millimeters of a vessel big enough to accommodate the stentrode is fair game, Oxley says.]