Trav, here's the excerpt from the article. I'm sure you've read it as it's one of the more informative ones out there. A must read for anyone interested in Lyme which is all of us.
"A second impairment to clear thinking that Lymies experience is the restriction of proper circulation within the blood vessels inside the brain. Using an instrument called the Single Photon Emission Computer Tomography scanner (SPECT scans), we are able to visualize the blood flow throughout the human brain in 3-D detail. What was seen in the brains of chronic neurological Lyme patients was an abnormal "swiss-cheese" pattern of blood flow. The cortical, or thinking region of the brain, was being deprived of good circulation; the occipital (eyesight) regions had an increase flow. This could help explain why most Lyme patients complain of poor concentration and overly sensitive eyes". (91)
http://www.lymeneteurope.org/info/the-complexities-of-lyme-disease