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> Moreover, an advantage of standard fNIRS is the high spatial specificity, and it is not clear how to actually translate the light intensity data in their case to brain activation (and probably it is going to be very noisy) as the light transverses all the head.

The X-rays in CT scans also transverse all the head. Would it be possible to use the same algorithms as CT to construct a 3D image with this tech?

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IIRC the highly diffractive nature of the medium limits resolution to something like 1 cm^3. I’m not an expert but I talked with some people working in the field a few years ago and this is what I remember. The computational problem is almost intractable.

No short term brain computer interface with optical techniques just yet.

No thought screening in airports and public spaces either. ;)

that was the premise of Mary Lou Jepsen's startup, OpenWater. I was fascinated by it but I'm not sure what became of it.

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