The brain was mapped before and after chiropractic care (to the cervical spine) in 500 adult volunteers. The volunteers were divided into six groups and underwent "specific manipulation of the second cervical motion segment." Blind spots are found in everyone and the size of the blind spot is an indicator of brain function. A larger blind spot indicates less cortical summation (less input from other areas of the brain). It was found that, in volunteers, an adjustment on one side of the neck in-creased blind spot size while an adjustment on the opposite side decreased it. "The results support the hypothesis that cortical-response maps can be used to measure the neurological consequences of spinal joint manipulation."
Comment: This is very exciting work which, as our technology continues to evolve, will give us a window into observing how brain activity changes as a result of spinal care.
Carrick FR. J Manipulative Physiol Ther. 1997 (Oct);20 (8): 529-545 JMPT, Oct. 1997;20(8), pp.529-45.