Each stimulus is processed in the brain at a certain speed/time. Hearing, vision and language are included in this process. Such as, the onset of language specific phonetic phonological analysis has been estimated at 100-200 ms. Listener the smaller the gap that can be detected. Such as, rapidly changing (gap) sounds such as /r/, /I/. There are need both short (20msec for phoneme duration signals) and long (200msec for syllable-duration signals) segments of speech.