High Frequency ABR

This study is looking at a method called 'ABR', which measures the electrical activity in the brain (brain waves) when we hear sounds. This study will look at the electrical activity in participants brains in response to high-pitched sounds. First, the investigators will find the quietest sounds the participants can hear. Then the investigators will use 'ABR' to measure the quietest sounds that trigger electrical activity in participants brains'. This is to find out if there is a difference between the quietest sounds participants can hear, and the quietest sounds that trigger these brain waves. We are also interested in finding out if having a hearing loss affects this.