For my PhD, I am studying how interruptions of regularities in auditory streams, i.e. deviance detection, are processed in the lowest stations of the brain. For this, I am non-invasively recording auditory brainstem responses of bats and humans. Questions that I am trying to answer are for instance (1) how deviance detection behaves in behaviorally relevant contexts and (2) how it might be related to oscillatory activity of the brain. Learning more about deviance detection and where it is generated improves our understanding of how the brain efficiently deals with the tremendous amount of information it receives and could help to understand how humans learn and comprehend speech.