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What does deoxyhemoglobin do to signal?

What is the total of deoxy and oxyhemoglobin called?

Deoxyhemoglobin appears when the brain extracts .... for metabolism

What would we expect to happen?

Why does this not happen?

Therefore ..... of hemoglobin leads to increase in fMRI signal

What increases in specific region following presentation of stimulus?

This is stronger than what?

However what is "a dip" that occurs at the start of the process?

What does this cause?