In normal individuals the impulse to speech first takes effect in the sphere of auditory imagery and is then transmitted to the motor nerves that control the organs of speech.
- Sapir (1921), a pag.17

The auditory centers alone may be excited; or the impulse to linguistic expression may be communicated as well to the motor nerves that communicate with the organs of speech [...]
- Sapir (1921), a pag.18

[...] emphasis, tone, and phrasing, the varying speed and continuity of utterance, the accompanying bodily movements, all these express something of the inner life of impulse and feeling, but [...] these [...] are [...] but modified forms of the instinctive utterance that man shares with the lower animals [...]
- Sapir (1921), a pag.38