Re: [Open-rtms-list] Would infrared sensors work as contacts?

[Alexander L. <ale...@gm...>]

Actually, infrared can penetrate the scalp (
http://authors.library.caltech.edu/58056/1/Yue_2015p93210S.pdf for an
example measurement), it just apparently gets very nonlocal due to
scattering and hence an array is much better than a targeted source
for illumination.

However, measuring neural activity through infrared light sounds
rather unfeasible, alone because of the scattering and distortion
through blood heat flow.
I'm not sure I quite understand why you think that a sensor
electromagnet would have an intensity, so far most EEGs I've heard of
have passive sensors that then amplify tiny signals given by the brain
in a circuit elsewhere; do people put a field on the sensors and if
so, why?
I don't think there is really any risk in using EEG sensors, or
couldn't think of one.

On Sun, Jan 15, 2017 at 11:15 AM, Aidan Hoolachan <aj...@bu...> wrote:
> No, infrared sensors / heat are a very different mechanism than magnetic
> coils and electromagnetic induction. Infrared does not penetrate the scalp
> like the magnetic fields are able to.
>
> On Jan 15, 2017 5:10 AM, "Joley Brown" <bro...@co...> wrote:
>>
>> The magnetic coils is a really inexpensive model for the eeg output,
>> but would infrared perhaps give the same or perhaps more wide spread
>> Signal Out? It seems the coils give a narrower set of responses. I'm
>> probably a bit off the path on that. But IR sensors measure heat with
>> say, 1/100th of a degree F. What I would have to fill in with that
>> equation, how much heat would be generated, and how quickly, by any
>> small neural clusters? The reason I could most easily justify is that
>> the higher intensity from the sensor electromagnet might be hazardous.
>> It's one of the cautions of doing these measurements. An IR sensor would
>> be a lot more passive,yes? and calibrated to watch a wider scan of those
>> clusters, more of them. To a processor the output of light vs a more
>> intensive part of the electro-magnetic spectrum would be a set of
>> numbers. Like representing a melody in F minor being played in a higher
>> key. It's 0300 local time and I should get some sleep before looking at
>> this again.
>>
>>
>>
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