Computers

Living brain-cell biocomputers are now training on dopamine

Living brain-cell biocomputers are now training on dopamine
Four human brain organoids, each with around 10,000 living human brain cells, wired into a biocomputing array in FinalSpark' s Neuroplatform
Four human brain organoids, each with around 10,000 living human brain cells, wired into a biocomputing array in FinalSpark' s Neuroplatform
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Four human brain organoids, each with around 10,000 living human brain cells, wired into a biocomputing array in FinalSpark' s Neuroplatform
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Four human brain organoids, each with around 10,000 living human brain cells, wired into a biocomputing array in FinalSpark' s Neuroplatform
Biological neurons constantly form, strengthen, weaken and drop connections as they learn – inspiring silicon-based neural computers
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Biological neurons constantly form, strengthen, weaken and drop connections as they learn – inspiring silicon-based neural computers
A spherical brain cell organoid
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A spherical brain cell organoid
Biocomputer chips need to be kept alive with fluids and nutrients, in sterile and temperature-managed conditions
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Biocomputer chips need to be kept alive with fluids and nutrients, in sterile and temperature-managed conditions
The computer communicates with the living brain organoids in both directions
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The computer communicates with the living brain organoids in both directions
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Current AI training methods burn colossal amounts of energy to learn, but the human brain sips just 20 W. Swiss startup FinalSpark is now selling access to cyborg biocomputers, running up to four living human brain organoids wired into silicon chips.

The human brain communicates within itself and with the rest of the body mainly through electrical signals; sights, sounds and sensations are all converted into electrical pulses before our brains can perceive them. This makes brain tissue highly compatible with silicon chips, at least for as long as you can keep it alive.

For FinalSpark's Neuroplatform, brain organoids comprising about 10,000 living neurons are grown from stem cells. These little balls, about 0.5 mm (0.02 in) in diameter, are kept in incubators at around body temperature, supplied with water and nutrients and protected from bacterial or viral contamination, and they're wired into an electrical circuit with a series of tiny electrodes.

A spherical brain cell organoid
A spherical brain cell organoid

These two-way electrodes can send pulses of electricity into the brain organoids, and they can also measure the responses coming out of them. And that's really all you need to start taking advantage of nature's greatest computing machines; neurons habitually search for patterns, seeking order and predictability.

You can create a virtual environment for them, complete with the capability to perform actions and perceive the results, solely using electrical stimulation. You can reward them with predictable stimuli and 'punish' them with chaotic stimuli, and watch how quickly they rewire themselves to become adept at orienting themselves toward those rewards.

We've written before about computer chips with integrated brain cells – notably the Australian DishBrain device by Cortical Labs, which uses 800,000 human brain cells grown onto silicon chips. DishBrain managed to learn to play Pong within about five minutes, and has demonstrated impressive capabilities as a super-efficient machine learning tool, even drawing in military funding for further research.

Biocomputer chips need to be kept alive with fluids and nutrients, in sterile and temperature-managed conditions
Biocomputer chips need to be kept alive with fluids and nutrients, in sterile and temperature-managed conditions

The FinalSpark team uses smaller organoids, wired into arrays, and it also adds a new wrinkle, in the ability to flood the organoids with reward hormones like dopamine when they've done a good job.

"We encapsulate dopamine in a molecular cage, invisible to the organoid initially," co-founder Dr Fred Jordan told Techopedia last year. "When we want to ‘reward’ the organoid, we expose it to specific light frequencies. This light opens the cage, releasing the dopamine and providing the intended stimulus to the organoid."

It's an absolutely bizarre frontier of research, and it certainly makes some people uncomfortable. But Jordan points out that humans have long harnessed living things to do work, be it the yeast that brews our beer or the horses that pulled ploughs through our fields.

Biological neurons constantly form, strengthen, weaken and drop connections as they learn – inspiring silicon-based neural computers
Biological neurons constantly form, strengthen, weaken and drop connections as they learn – inspiring silicon-based neural computers

Are these things sentient? Nobody really knows – and for a deep dive into the thorny ethics of this whole 'wetware computing' field, you should definitely check out our extensive interview with Brett Kagan of Cortical Labs, who has to wrestle with some pretty wild philosophical questions in his daily work.

But they could definitely prove useful – both as ultra-efficient cyborg machine learning platforms, and also as remarkable new tools to test the effects of various drugs on the brain's information processing capabilities.

FinalSpark's Neuroplatform places wetware biocomputing into a cloud-accessible format, allowing researchers and commercial users the ability to buy time with the brain chips, along with Python-based software with which to interact with the devices. The company will keep the brain organoids alive and healthy as long as possible, and you can give them things to do.

FinalSpark Neuroplatform for brain-organoid biocomputing

It's a very nascent area; GPT-5 will certainly not be trained using human brain cells. But these natural computers are so incredibly efficient – up to a billion times more energy-efficient than silicon chips – that FinalSpark believes they may yet play a role in mitigating climate change.

Current neural computers guzzle so much energy training large AI models that Elon Musk, among others, has predicted we'll soon be experiencing energy shortages around data processing centers. If cyborg biocomputers could radically reduce that energy consumption, they could certainly make a contribution – but they're a long way off scaling to the size of a single GPU, let alone the multi-billion-dollar clusters the AI giants are amassing.

I'll confess, FinalSpark's business name does send a bit of a chill down my spine. Forgive my wild, dystopian speculation here, but maybe there's a chance that silicon never manages to outstrip living cells in learning efficiency. Maybe these wetware bio-chips do scale advantageously. And maybe, when humanity is long gone, human brain cells might still prove useful to our AI descendents, a 'final spark' of biological life that might move forth into the cold emptiness of the galaxy without us.

Source: FinalSpark

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8 comments
8 comments
Daishi
This is probably more interesting than scary to me but I could see fear driven people looking to pass laws to limit experiments in this space some day.
kwalispecial
I can't help picturing IT, the brain that runs everything on the planet Camazotz in A Wrinkle in Time.
anthony88
Would it be possible to connect the silicon chip they are using to the brain already in a healthy human and do this? What about downloading information from the brain of a recently deceased or comatose patient?
Faint Human Outline
"Subject one appears stable yet bored. Subject two wants more ice cream- Yes, you will get more when you finish your computations. Perfect, thank you. Subject three is recollecting past memories of their donor's life experiences, fascinating, may be venturing into data privacy concerns. Subject four is... me? Systems are nominal. Now for some ice cream."
martinwinlow
"And where did you get the brain tissue from?" "Oh, Ab... Abby someone...?"
Cymon Curcumin
There is a reason that this research is shown being conducted under sterile fume hoods. Keeping cells alive in conjunction with chips is a damn mess and won’t have any applications outside of a research lab. Who is going to pay people to clean out the kidney filters and change the glucose drips and keep washing out all the tubes needed to keep cells alive on your computers? Cells aren’t magic — you can’t just leave them on a chip with wires attached and expect them to have the lifespan of the rest of the hardware or even the lifespan of cells in their normal environment. This is a biology research technique at best and a complete gimmick at worst.
Steve Jones
It's difficult to respond with just text. This story surely calls for a meme.
I'll settle for "yay - what's the worst that could happen?".
zhaviensdad
What's the approximate cost of this wetware implant?