- This version of BioExplorer is required for Wiz products.
- BioExplorer requires a security dongle (aka “HASP”) to run. The security dongle can be purchased from the store on the Home Page.
- A number of the designs listed below require media files as feedback presentation material. These can be found under the this site’s Tab “Video Lib”.
BioExplorer is the premier PC-based neurofeedback software which supports both the Wiz Family & Pendants. BioExplorer has excellent graphics & is simply without peer in its flexibility in creating protocols.
Below we provide a number of proforma ‘designs’ which can be downloaded into BioExplorer’s Design sub-directory. Note that a number of the designs require media files available under the ‘video lib’ tab. These video and audio files can be copied to the Media directory, a sub-directory of your PC software installation.
This library will be expanded over time. User’s are invited to share their favorite designs by posting here.
Designs incorporating Electrode Impedance Measurement (EIM) & Electrode Offset Potential (Offset)
- EIM is a measure of the quality of the connection between the electrode and the skin. A poor connection will result in a noisy or even un-usable EEG signal.
- Electrode Offset Potential measures the “battery” voltages generated by the chemical reactions between the metal electrode, the electrolyte paste, and skin or any impurities present. Excessive offset can result in flat-lining of the EEG signal and unusable low frequencies of the EEG & SCP.
How to build this measuring capability into your design is best illustrated with the examples that you will find at the end of this section. To understand the designs, it will be useful to understand some of the principles at play:
- All Wiz EEG devices do EIM
- EIM can be accessed two ways: thru a Helper function in BioExplorer’s Wiz window, or via setting Mode 4a
- EIM values are in HEG format, so it requires the BioExplorer design to have a source object set to HEG to receive it
- EIM in Mode 4a places the EIM values for ch1 & ch2 in slots 3 and slot 4 respectively. Bio-signals in Slot1 & 2 run concurrent with the EIM in slots 3 & 4
- In contrast, EIM by Helper function “Impedance Check”, replaces the bio-signal in the respective slots whilst the measurement is undertaken, thus this method can be used to measure the EIM in the four channels of the Q-wiz.
- EIM by Helper function can be more accurate than EIM by Mode 4a where 60Hz interference is a problem.
- EIM values multiplied by 1000 give the correct units of Kohms, range is 0K to 256K
- EIM is not available when the Helper function “Test Tone” is active
In respect of Electrode Offset potential, the above also generally applies, except
- Offset is measured in Mode 4b
- Offset Helper function is “Offset Check”
- Offset value is delivered in EEG format, so needs a Source object, separate from the EIM Source object set to EEG
- Offset value multiplied by 256 will give the correct value, usually represented as mV
- Helper “Electrode-Sense Off”, disconnects the electrode-off DC sensing circuit, removing ~2mV of offset to give a more correct reading
- Offset is generally measured with the EEG Freeze button in-active (ie not DC-coupled). In this scenario, Offset is the value required to bring the bio-signal back into range. With Freeze active, the bio-signal, if out of range, will not come back.
- Offset value range in the Wiz is +-500mV
Example design – using simple Mode 4a EIM:
Example design – how to have a button to switch between EIM & Offset (also switch Wiz between Mode 4a and Mode 4b) :
Modify existing BioExplorer designs to operate with the Wiz
Having added “PN_Wiz” to the list of drivers in the BioExplorer Device Manager, and checked the box to enable it, existing BioExplorer designs intended for the Pendant series of products can be used with the Wiz by simply right clicking on the Source object in the Signal Diagram view, choosing Properties and choosing a PN Wiz channel from the drop down list. The Wiz itself should be set to Mode 2 for EEG and Mode 1 for HEG.
Features such as electronic linking of electrodes, DC/AC coupling, and HEG calibration are available to these older designs because these functions don’t rely on the BioExplorer design to work.
On the other hand, to take advantage of new features like electrode impedance measurement, this does rely on the design and modifications to the design are necessary to incorporate it.
Sample BioExplorer Designs
Wiz Explorer – see what the Wiz can do