AO1

• ERP's are used to investigate the brain's response to stimuli
• Using statistical averaging technique, all extraneous brain activity from the original EEG recoding is filtered out leaving only those responses that relate to the presentation of a specific stimulus or performance of a specific task.
• What remains are event-related potentials: a type of brainwave that is triggered by particular events.
• ERP's work by measuring small voltage changes in the brain triggered by specific events or stimuli. Establishing a specific response to a target stimulus requires multiple presentations of the stimulus, and then averaging the responses together. This filters out brain activity that is not related to the appearance of the stimulus.