A paper about electrical activity in cultured human brain cells got a lot of attention this week:

Scientists Just Detected Brain Waves in Mini Lab-Grown Brains

Mini-brains grown in a lab show neural activity like preterm babies

The study, published in Cell Stem Cell, was about cortical organoids, three dimensional blobs of brain-like tissue that are created from induced pluripotent stem cells (iPSCs).

Researchers Trujillo et al. recorded electrical activity from the organoids as