configure BioExplorer for the H-wiz

This is an introductory description. The full description of Wiz devices can be found under the Manuals tab.

The H-wiz is a 2 channel device supporting HEG Modalities:

  • Toomim nIR HEG (supports 2ch operations, although only 1ch headbands are currently available)
  • Carmen pIR HEG system
  • pulse oximeters

It supports automatic calibration (“baselining”) of HEG signals.

The H-wiz is equally a wireless and USB-direct device. As wireless, two AA batteries are to be inserted and a wireless kit is to be separately purchased. As a USB-direct device, batteries are optional. If batteries are inserted then power is not drawn from the USB port. This means when teamed with a tablet or smartphone, the E-wiz does not drain the batteries of those devices. The choice of wireless or USB-direct is automatic: if the E-wiz receives power from the USB port then it will transmit over the USB -direct link. If not, it will commence transmitting wirelessly. The Transmit link is steady on when not transmitting wirelessly, and will blink when wireless is active. The number of blinks indicate the wireless channel number and this must be matched by the wireless dongle receiver.

The H-wiz has an 8-LED array which reflects the state of HEG channel 1 at any instant.  As such the H-wiz can act as a rudimentary stand-alone bio-feedback trainer.

Functions on the H-wiz are controlled by a Power button and two configuration buttons: a Mode button and a Calibrate button. Note that all functions can also be controlled from the Application, whether that application be BioExplorer, BioEra, EEGer, or Wiz Central.

“Mode” refers to the characteristics of the channels used to transport the bio-signals from the Wiz to the Application. Mode defines the sampling rate and the number of channels. “Modality”, on the other hand,  refers to the different types of bio- signals supported, such as pIR, nIR, and oximetry. Different modalities place different demands on the channel supporting them, thus for example, HEG can be supported on a low sampling rate channel and EMG demands a high sampling rate channel. The Wiz provides different Modes to optimally support different Modalities on up to four slots available for sending bio-signals to the Application.

Since the Wiz remembers certain parameters including Mode, in the most common usage scenario of  single channel & single modality, operation reduces to

  • plugging in the headband,Hwiz_layout01
  • turn on the Wiz, and
  • hit the play button on the Application.

The Wiz will auto-baseline to a value of 100. The objective of training is to increase this baseline value.

The Modes available are listed below. The Mode light on the Wiz will blink once for Mode 1, etc.

 

 

H-wiz Modes

<Mode 0> program mode – used to upload new firmware or interrogate firmware version number

<Mode 1> 2ch x 32sps – recommended for HEG with low-end tablets

<Mode 2> 2ch x 128sps – recommended for HEG generally

<Mode 3> 2ch x 512sps – grants higher bandwidth (and more noise) to the HEG signal

<Mode 4a> 4ch x 256sps – ch 3 & 4 used to transport the components of the Ch1 nIR HEG ratio value : the infrared component (Ch3) and the red component (ch4)

configurationSlot 1Slot 2Slot 3Slot 4Comment
Mode 1/2/3
nIR sensedNIR1NIR2
nIR & pIR sensedNIR1PIR1
pIR sensedPIR1Test Tone
pulse sensedPULS1Test Tone
pIR & pulse sensedPULS1PIR1
Mode 4a
headband sensedHEG1HEG2IR1RED1HEG (nIR or pulse) components (infrared, red) extracted

The lights on the Wiz can be used to confirm that commands sent from the Application have been received:

Indicator 
Transmit (blue)
On steadysending to Application via USB
On blinksending wirelessly
Off blinknot transmitting to Application (ie Program Mode)
4 blinksacknowledging command received for Application
No of blinkswireless channel number
Mode/Good (green)
OnnIR full signal strength, and/or pIR valid reading
OffnIR not full strength, or pIR reading out of range
No of blinksMode 0/1/2/3/4 = Program/32sps(2ch)/128sps(2ch)/512sps(2ch)/256sps(4ch)
Calibrate(blue)
Onwhen nIR, pIR or Oxi headband sensed
Offno headband sensed, all 2/4 channels used for EEG
Blinkwhen nIR/pIR/pulse baseline search for nominal value of 100 is under way

The Wiz Window in BioExplorer has the following functions for commanding the Wiz:Wiz_Command_BioExplorer

  • Main
    • Power – turn Wiz on & off
    • EEG Link References – not applicable, ignored
    • EEG Freeze Offset – not applicable, ignored
    • HEG Calibrate – initiate search for the HEG nominal value of 100
  • Mode
    • Program – Mode 0:  set this mode to update firmware or interrogate version number
    • HEG – Mode 1: set this mode for HEG signals to minimise the load on the PC processor – low end tablets
    • EEG – Mode 2: set this mode for HEG general use
    • ExG – Mode 3: set this mode for extra bandwidth (and noise) of the HEG signal
    • EEG+Impedance – Mode 4a: 2ch HEG and continuous electrode impedance measurement in ch 3 & 4
    • EEG+Offset – Mode 4b:  not applicable, ignored
    • 4Ch – Mode 4: not applicable, ignored
  • Helper functions used occasionally
    • Off – revert back to normal mode
    • Electrode Impedance Check – not applicable, ignored
    • Electrode Offset Check – not applicable, ignored
    • Electrode-sense Off – not applicable, ignored
    • Test Tone – inject a test sequence of alternating HEG values of 99.5 and 100.5, alternating at 1 second intervals
  • Buzzer (future models)
    • Disable – buzzer inactive
    • Warning – buzzer acts to warn when bio-signal is invalid
    • Feedback – buzzer allows E-wiz to act as rudimentary stand-alonf feedback machine (future)
    • Reward – as Feedback, buzzer is reward
    • Inhibit – as Feedback, buzzer is an inhibit
    • Long – buzzer 4 seconds
    • Short – buzzer 1 second
    • Test – initiate buzzer
  • USB+Wireless
    • USB Only – turn off wireless
    • 1…8 – turn on simultaneous USB and wireless, the latter allows monitoring of the eeg by a monitoring station

Checking the validity of bio-signals

There are a few things in the Wiz to enable you to check the health of the HEG system.

The Helper Test Tone function puts out a test tone of approximately 99.5 and 100.5, alternating every second. This checks most of the HEG circuitry.

In relation nIR HEG, the Helper Test also tests the signal sent to the nIR headband. In normal use, the Red and Infrared lights on the headband are switched rapidly making it impossible to see whether the infrared light (being largely outside the visible spectrum, and so very dim) is lighting or not. With the Test Helper, the signals sent to the headband are a slow flash of the Red and Infrared light so that it becomes possible to perceive that the infrared light is illuminating. If either light is not working, then a return-to-factory repair is required.