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Evoked O2Hb and HHb responses during visual stimulation for 1500 ms and 3000 ms, measured in ‘deep’ optode configuration, and correlation with MAP. Solid lines represent the average of arm-raised (redviolet) and no movement trials (bluegreen). Dashed lines denote 1 SD. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
