From: Alexander L. <ale...@gm...> - 2017-01-15 13:46:07
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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. >> >> >> >> ------------------------------------------------------------------------------ >> Developer Access Program for Intel Xeon Phi Processors >> Access to Intel Xeon Phi processor-based developer platforms. >> With one year of Intel Parallel Studio XE. >> Training and support from Colfax. >> Order your platform today. http://sdm.link/xeonphi >> _______________________________________________ >> Open-rtms-list mailing list >> Ope...@li... >> https://lists.sourceforge.net/lists/listinfo/open-rtms-list > > > ------------------------------------------------------------------------------ > Developer Access Program for Intel Xeon Phi Processors > Access to Intel Xeon Phi processor-based developer platforms. > With one year of Intel Parallel Studio XE. > Training and support from Colfax. > Order your platform today. http://sdm.link/xeonphi > _______________________________________________ > Open-rtms-list mailing list > Ope...@li... > https://lists.sourceforge.net/lists/listinfo/open-rtms-list > |