The group also is developing a second brain-interface technology, an intracortical microarray. This device enables the user to control movement with thoughts, but with a higher resolution and potentially greater control than the micro-ECoG because the tiny chip's 100 miniscule, spike-like electrode probes descend into the surface of the motor cortex. The probes read the signals coming from individual neurons. Because the arrays are embedded into the brain, this interface device could cause more scar tissue than the micro-ECoG. With support from the Defense Advanced Research Projects Agency, Schwartz is leading research using the array in animals paired with a dexterous prosthetic arm engineered at Johns Hopkins University.
https://ncats.nih.gov/pubs/features/brain-signals-action