An electrically-powered device assembly designed to continuously measure the electrical signals produced by a patient's brain and display/record them as an electroencephalogram (EEG) to evaluate brain function, typically in an examination room or intensive care unit (ICU) [bedside]; it may also monitor additional physiological parameters [e.g., electromyogram (EMG), respiration wave forms, blood pressure, haemoglobin oxygen saturation (SpO2)] in relation to EEG. It typically includes a control unit, electrodes, and components (e.g., amplifier, cables, probes). It may include data interpretation and/or telemetry features.