From: <no...@ti...> - 2017-01-15 14:55:02
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Unsubscribe On January 15, 2017 9:02:43 AM EST, "Abe S." <or...@gm...> wrote: >I think the infrared sensors that they use for measuring bran activity >actually measure changes in blood flow, which, as you say, ends up >covering >a larger area. The change in blood flow is also much slower than the >electrical potentials, so you can see broad regions becoming more or >less >active (more activity -> more oxygen and glucose required -> more blood >flow) but you can't look for things like alpha waves. > >-Abe > > >On Jan 15, 2017 8:47 AM, "Alexander Liebendorfer" ><ale...@gm...> >wrote: > >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 >> > >------------------------------------------------------------ >------------------ >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 -- Sent from my Android device with K-9 Mail. Please excuse my brevity. |