Effect of reading on blood flow changes in the posterior cerebral artery in early blind and sighted people - A transcranial Doppler study

The similar PCA flow response induced by Braille and print reading alone suggested a similar degree of occipital cortex activation in blind and sighted subjects. In sighted people, the 3-times higher flow velocity increase induced by “light stimulus + print reading” compared with “print reading alone” indicated that 2/3 of PCA flow increase during reading was due to the light stimulus and only 1/3 of flow response was caused by reading alone.