DISPLAYING ELECTROCORTICOGRAPHIC FINDINGS ON GYRAL ANATOMY

Human electrocorticographic findings recorded from subdural arrays of electrodes were topographically mapped directly onto magnetic resonanc e images of gyral anatomy. With this technique gyri involved in genera ting somatosensory evoked potentials and epileptic phenomena are easil y identified. Regions of the cortex which exhibit local spectral chang es associated with cognitive tasks can also be visualized. These compo site images of structure and function can provide insight regarding th e functional organization of human cortex in relation to gyral anatomy and localized pathologic rhythms.