NIRS-fMRI concurrent experiement – it could be painful

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Back in 2010 we ran a simultaneous fMRI-NIRS experiment (see publication here). At that time we borrowed a 10m long optical fibers from Hitachi (Thank them!). The participants had to wear a NIRS cap (with probes) while lying in a fMRI scanner.

NIRS-fMRI
NIRS-fMRI

And this is one of the Hitachi ETG 4000 probes.

Hitachi ETG 4000 probe
Hitachi ETG 4000 probe

As an experimenter, I needed to try and test the experiment myself. The lying position can sometimes make the probe push too hard to my head. As a result, after ~30 minutes of the experiment, the probes left a dent on my head (only temporarily). It was pretty painful.

NIRS probe leaves a dent on head
NIRS probe leaves a dent on head

How to make the NIRS experiment more comfortable to our participants is a regular topic in our NIRS meeting. Even today, we do not have a satisfying solution.



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