Science

New science research from Columbia University described

Published in Telemedicine Business Week, December 23rd, 2009

According to a study from the United States, "In functional brain imaging there is controversy over which hemodynamic signal best represents neural activity. Intrinsic signal optical imaging (ISOI) suggests that the best signal is the early darkening observed at wavelengths absorbed preferentially by deoxyhemoglobin (HbR)."

"It is assumed that this darkening or ''initial dip'' reports local conversion of oxyhemoglobin (HbO) to HbR, i.e., oxygen consumption caused by local neural activity, thus giving the most specific measure of such activity. The blood volume signal, by contrast, is believed to be more delayed and less specific. Here, we used multi-wavelength ISOI to...

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Source: Telemedicine Business Week (2009-12-23)

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