Connecting FNIR to Vizard

 

Note: Currently tested and working with Vizard 6

 

Description from Biopac on FNIR: "An fNIR System provides researchers with real-time monitoring of tissue oxygenation in the brain as subjects take tests, perform tasks, view advertisements, experience ergonomic layouts, or receive stimulation. It allows researchers to quantitatively assess brain functions—such as attention, memory, planning, and problem solving—while individuals perform cognitive tasks. Monitor cognitive state of the subject in natural environments".

 

“Easily sync with stimuli presentation systems and integrate with other physiological and neurobehavioral measures that assess human brain activity, including eye tracking, pupil reflex, respiration, and electrodermal activity”.

 

After connecting the hardware for your FNIR you will need to start up COBI studio to stream the FNIR data to Vizard.

 

Under Data Source add your hardware

In Marker Source you can add markers that you can send to sync with events, such as key presses.

 

In the Network Broadcast section, add a TCP protocol broadcast and not the port number and host IP address.

 

 

Click on Prepare and make sure your hardware is set up and ready to go. Place the FNIR device under your headset and connect left and right side connections.

 

Click on “Experiment”. Here you can enter experiment information to catalog the data. If you are just checking the data or demoing the system, you can click “No Experiment”

 

Click on Record and then click the red triangle to begin recording your data

Next you will run a Vizard script to collect and save the data.

 

Vizard Code

 

Contact Worldviz for the “cobibiopac.py” module that is needed to send FNIR data to Vizard

 

Use the following code as an example to send data to Vizard. Make sure to place the cobibiopac.py module in the same folder as your code (or reference the path that it is located).

For further analysis of data use the FNIR soft software

 

Connecting Vizard to BIOPAC AcqKnowledge

By Jeff Loomis

BIOPAC provides a large range of monitoring devices for detecting physical or physiological changes over time. The BIOPAC virtual reality platform provides:

  • Controlled and replicative experimental setups

  • Manipulation of the environment (and avatars) that would be impossible or prohibitively expensive in the real world

  • Synchronization of the events from the virtual world with physiological data

  • Biofeedback data transfer protocol for real-time digital communication, which allows the participant’s physiological feedback to control the VR world

Using physical data with Vizard

Vizard supports interaction with the data provided from these devices using the biopacndt.py module, a Python API for connecting to BIOPAC’s AcqKnowledge software with Network Data Transfer (NDT).

Note: biopacndt.py is included with the NDT license; contact support@biopac.com if needed.

The connection to AcqKnowledge can be made locally or over the network. As long as the Respond to auto-discovery requests option is enabled in AcqKnowledge there is no need to specify a remote machine’s IP address in Vizard.

If you have AcqKnowledge installed, the biopacndt.py file is found in the following location: C:\Program Files\BIOPAC Systems, Inc\AcqKnowledge\Network Data Transfer Examples\Python 2\source Copy and paste the file to the Vizard Python folder: (C:\Program Files\WorldViz\Vizard\python). Placing files in the Vizard Python folder will ensure each Vizard project can load them.

Software setup in AcqKnowledge

Enable the NDT Network Data Transfer protocol in AcqKnowledge in order to stream data to and from Vizard. (NDT is a licensed feature add-on.)

  1. In AcqKnowledge, go to Display > Preferences > Networking.

  2. Select the checkboxes for Enable network data transfer and Respond to auto-recovery requests.

  3. Restart the AcqKnowledge software to activate the Network Data Transfer.

This configuration only needs to be done once.

To see event markers in AcqKnowledge, have the events bar visible

You can also toggle to show the “Event Palette” to see a timeline of events.

Vizard to AcqKnowledge

In the code below, Vizard sends a signal to drop an event marker in AcqKnowledge:

AcqKnowledge to Vizard

In the following code, Vizard prints out the data streaming from AcqKnowledge: