Development and Design

The Utah Array is a bed-of-nails microelectrode design developed at the University of Utah in the early 2000s. The array consists of 96 to 100 electrodes arranged in a 10-by-10 grid, each electrode penetrating 1-2 millimeters into the cortex. The name derives from the appearance of the densely-packed electrode tips resembling nails in a bed.

Signal Quality Advantages

The intracortical penetrating approach provides superior signal quality compared to surface electrodes or non-invasive methods. Each electrode records activity from individual neurons within a few hundred micrometers, enabling identification of single-unit action potentials rather than broader population signals. This high spatial resolution directly enables more accurate neural decoding.

Gold Standard Status

The Utah Array became the gold standard for BCI research and remains the basis for current commercial systems used by Neuralink, Blackrock, BrainGate, and other leading companies. Decades of research have established the reliability and decoding capability of this electrode configuration.

Chronic Implantation Limitations

A significant limitation is that chronic intracortical implantation triggers glial scarring around the electrodes, causing gradual signal degradation over months and years. The foreign-body response to the electrode material and geometry creates a hostile tissue environment that limits long-term device function.

Evolutionary Advances

Companies including Precision Neuroscience and others are developing alternative electrode geometries to address chronic implant limitations while maintaining the signal quality advantages of intracortical recording. The Utah Array remains the reference standard against which competing approaches are measured.