Electrode Arrays

ECoG and EEG Grids

NeuroNexus offers ultra-flexible EEG and ECoG arrays specifically designed to be placed on the surface of the mouse or rat skull or the brain. These surface grids provide high recording resolution and are meticulously designed to conform closely to the brain surface, ensuring optimal electrocorticography measurements. You can select from reticular grid layouts or functional layouts, which offer enhanced recording resolution over key cortical areas.

  • Flexible and durable – Fabricated with our polymer MEMS technology, our EEG and ECog probes easily conform to the skull and the brain surface. Use a drop of water to adhere the probe to the skull.
  • Stable – High-quality recordings have been obtained over months.
  • Optimized array designs – Select from a variety of surface array designs featuring different recording site placements, for different applications or animal models.
  • Versatile – Combine an ECoG array with a NeuroNexus penetrating array to establish concurrent surface and intracortical interfaces.

“Recordings with the multi-site grid were stable over periods of months (up to 3 months were tested without a significant reduction of signal quality). Over the course of epileptogenesis, seizures and other types of large amplitude interictal discharges were easily localized with the EEG grid.”

Drs. Liset de la Prida + Manuel Valero
Instituto Cajal – CSIC

“The chronic version of the Micro-ECoG electrodes from NeuroNexus made our implant procedure on the cerebellum much easier and more reliable. Electrode breakage is no longer a problem.”

Dr. Mesut Sahin
New Jersey Institute of Technology

H-Series is a hybrid package introducing a flexible ribbon between the surface grid and connector PCB to allow flexible positioning of the connector on the head.

For information regarding connector package specifications, please visit product documentation here.

Surface Arrays Properties

Arrays Thickness

15 µm

Electrode Site Material


Substrate Material


Channel Count

EEG options: 30 (Mouse EEG), 32 (all other designs). Custom options are available.

ECoG options: 16, 32, 64 (varies by design). Customizable up to 256.


Available Packages

EEG options: H32, HC32, HZ32, X3-H32

ECoG options: H16, HC16, HZ16, H32, HC32, HZ32, H64, H64LP, HC64

Custom designs may use H128, H128LP, IH128, AVH128, AVIH128, H256, IH256, AVH256, AVIH256

For EEG arrays, select a mouse or rat grid design and a connector package. We also have a down-sampled, 16-channel rat ‘functional’ EEG grid available.

ECoG arrays are available for a wide variety of applications, including combined applications with penetrating probes and Matrix Arrays™.

If you are unable to find an array design that meets your needs, please Contact us and tell us about your project. We may be able to design a new array for you!