On Fri, 16 Sep 2005 13:06:57 +0200, Jeff B. <jeffbaure at yahoo.fr>
>Le Thu, 15 Sep 2005 20:46:18 -0400, r norman
><NotMyRealEmail at _comcast.net> a écrit :
>>>>Can someone provide a reasonably concise definition of "Blood
>>>Oxygenation Level-Dependent Signal Level" and its correlates?
>>>Google on "blood oxidation level dependent signal" and you get a lot
>>of good hits. The functional MRI (fMRI) imaging signal that is
>>recorded depends on blood oxygen level. Therefore the level
>>(magnitude) of that signal is called "blood oxygenation level
>>Maybe this is also relevant for HEG (HemoEncephaloGraphy) which
>estimates the frontal activity levels via near IR spectrometry and
Just a quick correction here. I see my fingers wrote "blood oxiDAtion
level" when, of course my head was telling them blood oxyGENAtion
level". Although both produce search results, there really is a
difference. Of course there is no oxidation-reduction reaction when
blood is oxygenated.