Near Infrared Spectroscopy for Brain Computer Interfacing Make Part 9

These are the wrong LEDs. In the next clip ...once I find it I will point out the correct LEDs. There is nothing really for the general viewer in this clip. You can safely skip over it.

Tomas

Near Infrared Spectroscopy for Brain Computer Interfacing Make Part 8

Never press the red button it seems. http://www.youtube.com/watch?v=FT4YbO_1mvA&feature=related

Tomas

Near Infrared Spectroscopy for Brain Computer Interfacing Make Part 7

I'm afraid this clip is one for the purist as its a shaky hand shot of the Labview instrument created for setting up the NIRS device based on the numbers of sources, detectors and modulations frequencies that you use. I have screencast this separately and will put this up in the future. We fire it up and we can see the LED sources light up as well as the output from some of the detectors.

Tomas

Near Infrared Spectroscopy for Brain Computer Interfacing Make Part 6

In this part Chris speaks about the power supplies used and their settings. This is more a how-t0 for this particular set up and is taking the place of a manual for our system it seems. Chris speaks of the LED driver unit - this is an important piece of kit as obtaining a stable optical signal is contingent on driving the LEDs in a highly controlled fashion. The LED driver is driven from the other piece of National Instruments kit - NI-PXI6723. The number of wires appears to be exponentially increasing....yikes.

Tomas

Near Infrared Spectroscopy for Brain Computer Interfacing Make Part 5

In this profound clip we talk briefly of leads we find in a plastic bag. I posted this for completeness there is nothing here to delay the blog reader avidly wondering where this NIRS story is going.

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Near Infrared Spectroscopy for Brain Computer Interfacing Make Part 4

In Part 4 we speak of power connectors. Its a mercifully short clip.

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Near Infrared Spectroscopy for Brain Computer Interfacing Make Part 3

In this part Chris stresses the importance of relieving strain on the connectors. We struggled to make this clip really interesting.

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Near Infrared Spectroscopy for Brain Computer Interfacing Make Part 2

In Part 2, Chris explains how the seven detectors are connected to the Labview powered National Instruments NI-PXI4462.

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Near Infrared Spectroscopy for Brain Computer Interfacing Make Part 1

Today I have posted a series (9 in total) of clips in which Christopher Soraghan gives us a breakdown of a piece of kit he developed (with Fiachra, Charles, Ray and myself) as part of his research. The complete system is a near infrared spectroscopy instrument capable of non-invasive brain activity monitoring. He used it as part of a biofeedback system for brain computer interfacing. The system consists essentially of a number of dual wavelength optical sources (LED-based) and some high quality sensitive detectors (APDs). In todays clip Chris shows us inside the detectors. These are Hammamatsu C54060-01 APDs. They are coupled to the subjects heads via optical guides (just a big fiber bundle) and these are then lined up with the APD detector.

You can find an overview of the complete system in the following paper:

www.bcl.hamilton.ie/~barak/papers/NIRS-12-channel-EMBS-2008.pd

Tomas