Technologists give patients sensory inputs, such as a loud noise, and measure the brain waves that appear in response to the input. Some patients have their brain waves monitored while they sleep. Because these technologists give more than EEGs, they are often called electroneurodiagnostic technologists. During testing, technologists monitor patients' vital signs for changes. If an emergency happens, such as a heart attack, technologists provide care until help arrives.
Some technologists write technical reports that summarize test results.
Technologists may have supervisory or administrative duties. They may manage the workers in the laboratory. They also may keep records, schedule appointments, and order supplies. More experienced technologists may train new workers.