2014 Parallel Processes fMRI Brain MIT Tech Rev Greece Georgiou

<p>Nov 06, 2017 11:00 AM</p>

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fascin article in MIT Tech Rev. &nbsp;from 2014 &nbsp;(seen by me today);</p>

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fMRI work &nbsp;by</p>

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Harris Georgious in Athens.</p>

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how many "cpu cores" &nbsp;functioning in brain during varous tasks:</p>

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Answer: &nbsp;abt 50;</p>

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peak power 20 watts; &nbsp;connex: abt 10K per neuron; &nbsp;&nbsp;100B neurons &nbsp;(estimates)</p>

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each voxel is about &nbsp;&nbsp;5 cubic mm &nbsp;(hence &nbsp;about 1.75 mm &nbsp;&nbsp;vixels &nbsp;(cubed))</p>

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3d grid of &nbsp;&nbsp;60 by 60 by 30 voxels for complete brain &nbsp;= &nbsp;108K &nbsp;voxels.</p>

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over &nbsp;3 minute task &nbsp;= about &nbsp;30 million data points.</p>

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Now... &nbsp;&nbsp;Georgiou work: &nbsp;how many indep. processes.</p>

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similar to... how many cpu cores to run all the active processes.</p>

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he did ICA. on synthetic &nbsp;fMRI &nbsp;made of of 8 difft signals =>

as expected: eight &nbsp;different signals.</p>

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