The voxels of modern fMRI can be the size of a cubic millimeter. The volume of the brain
Description
The voxels of modern fMRI can be the size of a cubic millimeter. The volume of the brain is about 1 200 000 mm 3 , so scanning high-resolution fMRI divides the brain into one million small cubes. The problem is that on neural scales this is still quite a lot - each voxel contains tens of thousands of neurons. So, at best, the fMRI shows the average blood flow drawn by each group of 40,000 neurons or so. An even bigger problem is a temporary solution. fMRI tracks blood flow, which is inaccurate and occurs with a delay of about a second - an eternity in the world of neurons. EEG Scale : high Resolution : very low spatial, medium-high temporal Invasiveness : non-invasive Invented almost a hundred years ago, EEG (electroencephalography) puts a lot of electrodes on the head. Like this: EEG is definitely a technology that will look ridiculously primitive for people of 2050, but at the moment it is one of the few tools that can be used with absolutely non-invasive NCI. EEG registers electrical activity in various areas of the brain, displaying the results as follows:
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