JHA410H1 Lecture Notes - Lecture 8: Partial Seizure, Stellar Magnetic Field, Facial Recognition System
Document Summary
What can eeg measure: epsps in apical dendrites (closer to surface) of pyramidal cells, radial current is more detectable, therefore, measures electrical potential activity from gyri, eeg better at measuring radial sources (projecting outside the cortex) Exits the skull, scalp, etc and be caught by electrode: tangential sources (sulci) will not pass through skull and scalp to be caught by electrodes, where are radial sources? gyri. Eeg (or meg) signals alone do not have sufficient information to determine precise origin of sources. The more electrodes, the more information/accuracy (localizing any source better with more electrodes: forward solution taking a particular algorithm to have the best guess of the source of that activity. Multiple methods (all software based developed by engineers, mathematicians, physicists) We used minimum norm estimation (mne) reducing error that we might have in determining where the sloreta, sam, dipole modeling, lcmv source is.
