METHOD TO REDUCE BLUR DISTORTION FROM EEGS USING A REALISTIC HEAD MODEL

A mathematical procedure, which we call ''Deblurring,'' was developed to reduce spatial blur distortion of scalp-recorded brain potentials d ue to transmission through the skull and other tissues. Deblurring est imates potentials at the superficial cerebral cortical surface from EE G's recorded at the scalp using a finite element model of each subject 's scalp, skull and cortical surface constructed from their magnetic r esonance images (MRI's). Simulations indicate that Deblurring is numer ically stable, while a comparison of deblurred data with a direct cort ical recording from a neurosurgery patient suggests that the procedure is valid. Application of Deblurring to somatosensory evoked potential data recorded at 124 scalp sites suggests that the method produces a dramatic improvement in spatial detail, and merits further development .