An apparatus comprises a data processing unit (100) and a stimulator (112). The data processing unit (100) receives first electroencephalographic data based on a measurement of a brain of a person (108) exposed to one or more estimated or measured non-zero amounts of anesthetic drug substance. The data processing unit (100) performs a first comparison between the first electroencephalographic data and corresponding data of a reference brain function, and outputs information about the first comparison. The stimulator (112) provides the brain of the person (108) exposed to the anesthetic drug substance with brain stimulation on the basis of a direct or indirect reception of the information about the first comparison.
APPARATUS AND METHOD FOR ELECTROENCEPHALOGRAPHIC MEASUREMENT