Ultracortex "Mark IV" EEG Headset

$ 349.99

Important Notes:

  • This kit DOES NOT INCLUDE a Cyton Board or Ganglion Board. These items must be purchased separately.
  • You must purchase the right SIZE for your head. See headset sizing instructions below.
  • Batteries not included. See the recommended batteries section below.
  • Watch the Assembly Tutorial Here.

Product Description 

The Ultracortex is an open-source, 3D-printable headset intended to work with any OpenBCI Board. It is capable of recording research-grade brain activity (EEG), muscle activity (EMG), and heart activity (ECG). The Ultracortex Mark IV is capable of sampling up to 16 channels of EEG from up to 35 different 10-20 locations.

The Ultracortex Mark IV is the latest edition of the Ultracortex—a comfortable, adjustable, and 3D-printable EEG headset, compatible with all of the OpenBCI boards. The Ultracortex’s revolutionary design uses dry EEG sensors and takes less than 30 seconds to put on and get up-and-running (check out the video demo below).  

Ultracortex Mark IV Purchasing Options

You have the option to select 3 different Ultracortex Mark IV products:

  • Print-It-Yourself ($299.99-399.99): this product comes with all of the pieces required to assemble a full Ultracortex Mark IV aside from the pieces you can print yourself with a desktop 3D-printer. This kit is perfect for those who have their own 3D Printer (OpenBCI board not included). Check the assembly guide for instructions.
  • Unassembled ($499.99-599.99): this product comes with all of the pieces required to assemble a full Ultracortex Mark IV headset, including the pieces that are 3D-printable (OpenBCI board not included).Check the assembly guide for instructions.
  •  Pro-Assembled ($699.99-849.99): if you select this product, you will receive a fully-assembled Ultracortex Mark IV (OpenBCI board not included). 

What comes in the box?

Picking Your Size (Head Circumference)

Be sure to get the right size for your head! Click HERE for measuring instructions.

  • Small = 42-50cm
  • Medium = 48-58cm
  • Large = 58-65cm 


Ultracortex Mark IV Product Highlights

We have very high expectations for the Ultracortex Mark IV. Improvements from the Mark III include:

  • Higher node count (especially above motor cortex & visual cortex). The Ultracortex Mark IV will be able to target 35 electrode locations of the 10-20 System, as depicted in the diagram below
  • Maximum comfort for prolonged recording 
  • Simplified assembly and adjustability (based on feedback from our Mark III customers)
  • Secured electrode cabling for reduced noise and improved aesthetic 


If you have suggestions for Mark IV additions, please contribute to the ongoing Forum thread: Ultracortex Mark III Feedback & Mark IV Priorities


 Recommended Battery/Charger Options (NOT INCLUDED)

  • (2x) Lithium Ion Rechargeable Battery Pack (500mAh) from Adafruit or Sparkfun — we recommend buying an extra battery so you can continue working while you recharge!
  • (1x) A charger for your battery pack (Adafruit or Sparkfun)

Up & Running in Under 30 Seconds 

One of the great things about the Ultracortex design is how fast it is to get it up-and-running. Adjusting the headset for different head shapes and sizes is easy. All you have to do is twist the nut in the electrode holder. Once you adjusted the electrode holders at the various frame nodes, you can put the headset on and get up to 16 channels of EEG data streaming in under 30 seconds. Check out the video below!



The Ultracortex Mark IV is not a medical device nor is it intended for medical diagnosis and provided to you "as is," and we make no express or implied warranties whatsoever with respect to its functionality, operability, or use, including, without limitation, any implied warranties, fitness for a particular purpose, or infringement. We expressly disclaim any liability whatsoever for any direct, indirect, consequential, incidental or special damages, including, without limitation, lost revenues, lost profits, losses resulting from business interruption or loss of data, regardless of the form of action or legal theory under which the liability may be asserted, even if advised of the possibility of such damages.

Refund Policy here

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