The time span during which the brain integrates visual and auditory information into a single unified percept is called, appropriately enough, the temporal window of integration. Within this window, subjectively speaking, the brain considers the auditory and visual events to be simultaneous. The windows can be over 100 milliseconds for speech—for example, if there is a mismatch of less than 100 milliseconds between the audio and visual tracks of a movie, it rarely comes to our attention.
