Seeing through the skull: Advanced EEGs use MRIs to accurately measure cortical activity from the scalp

摘要: There is a vast amount of untapped spatial information in scalp- recorded EEGs. Measuring this requires use many electrodes and application signal enhancing procedures to reduce blur distortion due transmission through the skull other tissues. Recordings with 124 are now routinely made, techniques have been developed. The most advanced these uses from subject's MRI correct distortion, effect providing measure actual cortical potential distribution. Examples presented, including validation subdural recordings an epileptic patient. equivalent dipole modeling somatosensory evoked also presented which two adjacent fingers clearly separated. These results demonstrate that EEGs can provide images superficial electrical activity detail approaching O15 PET scans. Additionally, appears same degree resolution as reported for MEGs. Considering EEG technology costs ten fifty times less than brain imaging modalities, it completely harmless, be made naturalistic settings extended periods time, greater investment advancing seems very desirable.