Brain uploading is transitioning from science fiction to a rigorous scientific pursuit, with researchers using a tiny roundworm as a testbed to answer a fundamental question: can a human mind run on a computer instead of a biological brain? Harvard-MIT researcher Davy Deng has outlined a concrete three-part engineering challenge that separates serious neuroscience from speculation, and he's proposing an unexpected starting point for solving it.

What Would It Actually Take to Upload a Human Brain?

The core question sounds simple but proves devilishly complex: is the human brain "substrate-independent," meaning it could function on something other than biological tissue? Deng frames this as three interconnected problems that must be solved in sequence.

"What data define a mind? How do you measure them? And once you have all of those data, how do you make it run?" said Davy Deng, a joint doctoral candidate in the Harvard-MIT Health Sciences and Technology program.

Davy Deng, Joint Doctoral Candidate, Harvard-MIT Health Sciences and Technology Program

Rather than attempting to tackle the human brain directly, Deng suggests starting with something far simpler: the C. elegans roundworm. This organism has only 302 neurons, and its entire nervous system was completely mapped decades ago. Scientists have since attempted to emulate its entire brain in a computer, but without success so far. This apparent failure is actually instructive, Deng argues, because it forces researchers to understand what success even means before scaling up to larger brains.

How to Build a Scientific Pipeline for Brain Emulation?

• Measure: Use advanced techniques like expansion microscopy to create detailed maps of neural tissue, capturing not just structure but also biological signals such as DNA, RNA, and proteins that leave chemical and biological footprints at every synapse.
• Compile: Take the measurement data and use it to build a biologically informed artificial neural network for each unique organism, creating a digital version of its nervous system.
• Compare: Test the digital brain's fidelity against the real organism's behavior, checking whether the simulation accurately predicts how the animal responds to stimuli and environmental changes.

Expansion microscopy is particularly crucial to this approach. The technique allows researchers to retain biological signals that would otherwise be invisible, effectively adding color and detail to what would otherwise be black-and-white pictures of brain tissue. This generates a much more detailed and information-rich map of the entire nervous system.

Deng emphasizes that this "measure, compile, and compare" pipeline is exactly what separates science fiction from science. C. elegans is currently the only animal through which researchers can run this complete pipeline, making it the ideal starting point for understanding whether brain uploading is theoretically possible.

Deng

Why Does This Matter Beyond Just Uploading Minds?

The implications extend far beyond digital immortality. Understanding how to map, measure, and emulate a complete nervous system could revolutionize treatment of neurological diseases, advance artificial intelligence research, and fundamentally reshape how we understand consciousness and emotion. But Deng stresses that the societal impact demands broad participation beyond just neuroscientists and technology executives.

"The impact of whole brain emulation will become increasingly disruptive as it progresses, which is why the discourse cannot belong solely to neuroscientists or tech billionaires. It has to belong to all of us," explained Deng.

Davy Deng, Joint Doctoral Candidate, Harvard-MIT Health Sciences and Technology Program

Deng also noted an interesting cultural divide in how people respond to brain uploading research. West Coast audiences tend to lean forward with interest, while East Coast audiences often show skepticism. Regardless of geography, he argues that the biggest contribution of whole brain emulation may not be digital immortality at all, but rather a profound appreciation for what makes each person unique.

The path forward requires decades of well-funded, well-coordinated collaboration and sustained public interest. Deng emphasizes that scientists have a social responsibility to bring reliable measurement and interpret data honestly, especially when the research touches on such fundamental questions about human consciousness and identity. The work is rigorous, the timeline is long, but for the first time, brain uploading is being treated as a legitimate scientific endeavor rather than pure speculation.