 Templates are seen as innate recognition devices that are rudimentary at birth and tuned as language is acquired. They serve as the basis for the recognition product. And this is how perception would work. First the ear amplifies the incoming signal and transmits it to the auditory nerve. During the primary auditory analysis the signal is filtered and non-speech components are separated from speech. To cope with the complex signal auditory patterns such as formant frequencies must be identified. At the end of the recognition process phonological units such as phonemes or features are extracted from the signal. The whole process is coordinated by the brain using a set of internal patterns the so-called templates with which the incoming signal is compared and matched.