electroencephalography

ɪˌlɛktrəʊɪnˌsɛfəˈlɒɡrəfi
ɪˌlɛktrəʊɪnˌkɛfəˈlɒɡrəfi

noun

the measurement of electrical activity in different parts of the brain and its recording as a visual trace (on paper or on an oscilloscope screen).