Labs are using mini human brains to test drugs and run simple games

In short: Scientists are growing small clusters of human brain cells in labs and using them to study brain diseases and to experiment with new kinds of computing.

What's going on

Researchers can take a small sample of adult cells, like skin, and turn them into “brain organoids,” which are tiny lumps of brain tissue grown in a lab dish. They contain millions of cells, including neurons, which are the brain’s signal-sending cells. Over time, these organoids can produce repeating electrical patterns that look similar to early “brain waves” seen in premature babies.

Many labs already use organoids as test subjects to see how diseases, toxins, and medicines affect the brain. Scientists say this matters because brain and mental health drugs often fail in human trials, and animal tests do not always predict what happens in people.

Some groups are also trying to use living neurons as a kind of computer. At UC San Diego, researchers use electrical signals to stimulate organoids and measure how they respond. In Australia, startup Cortical Labs grows neurons on chips and lets researchers interact with them through a cloud service, then trains the cells with feedback, a bit like teaching through rewards and penalties.

Cortical Labs has shown neuron cultures learning simple games like Pong, and it has also demonstrated a Doom setup. The company says its “CL-1” devices keep neuron cultures alive for months with built-in life support.

What to watch

This work raises ethical questions, especially if organoids get bigger and more complex, but many researchers say the near-term focus is practical: better testing for drugs that affect learning and memory. A key technical limit today is size, since organoids can suffocate in the middle without blood vessels, but several labs are working on ways to deliver oxygen and nutrients more effectively.

Source: Wired