Human mini-brains show ‘wetware’ computing promise in Swiss lab

In a Swiss laboratory, tiny clumps of human brain cells are being kept alive and wired to electrodes to act as rudimentary processors—a nascent field researchers call biocomputing or “wetware.” The organoids cannot be rebooted if they die, but proponents say their biological efficiency could one day complement or even surpass silicon chips used to run modern artificial-intelligence systems.

FinalSpark co-founder Fred Jordan argues that rather than trying to mimic neurons, researchers can tap real ones. He says biological neurons are vastly more energy-efficient than artificial ones and can be grown indefinitely in culture, though the technology today is far from matching conventional hardware.

To make the “bioprocessors,” scientists transform donor-derived skin cells into stem cells and then into neurons, forming millimetre-wide organoids with roughly the neural complexity of a fruit-fly larva. Electrodes read the cells’ activity and stimulate them with small currents, producing responses that researchers map to ones and zeros.

Ten universities are running experiments on the platform. At the University of Bristol, a team used an organoid as the control unit for a simple robot that learned to distinguish braille letters—work that has exposed major challenges in encoding inputs and deciphering outputs, not to mention the cells’ limited lifespan.

At Johns Hopkins University, scientists are using similar organoids to probe neurological conditions such as autism and Alzheimer’s disease, where near-term biomedical gains may arrive sooner than practical wetware computers. Ethicists are looped in to address concerns about the possibility of consciousness—experts say the risk is remote given the organoids’ small size and lack of pain receptors.

Researchers still struggle to explain quirky behaviours, such as spikes in neural activity when an incubator door opens. For now, wetware remains a long-range bet, but one that could reshape both computing and brain science if the practical and ethical hurdles are solved.