brain fingerprintingˈbrain ˌfingerprinting noun [uncountable] 
the process of measuring the electrical activity in someone’s brain to see if they react to a particular object or picture. This process could be used to check if someone is telling the truth, for example if they are answering questions from the police.
the process of measuring the electrical activity in someone’s brain to see if they react to a particular object or picture. This process could be used to check if someone is telling the truth, for example if they are answering questions from the police.