Watering the entire garden for the sake of one thirsty flower....
what is important to know about this statement according to the role in fMRI(BOLD)?
Be clear...thank you?
"watering the entire garden for the sake of one thirsty flower" the role in fMRI?
The newest research showed that it took three seconds or more after an event for the flow of blood to increase to an area of the brain dealing with a stimulus. That is the blood-flow increase usually pictured in brain-function studies with PET or functional M.R.I. techniques, the Israeli researchers said. However, the initial reaction observed in the Weizmann research by directly imaging the exposed brain -- the direct transfer of oxygen from blood cells to neurons -- occurred in the first tenth of a second and was lost to conventional imaging, they said.
The later increase in blood flow to the area, Dr. Grinvald said, was obviously an attempt by the body to supply more oxygen for brain activity. But the increase in blood was so abundant that it covered an area much larger than the region directly involved in the activity being studied, masking some of the subtle changes, he said.
The body's reaction, the researchers said in the paper, was like "watering the entire garden for the sake of one thirsty flower."
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