
1. Theories
1.1. The Divine Source
1.1.1. Adam named all living creature.
1.1.2. Saravasti, wife of Brahma, gifted the world language.
1.1.3. Psammetichus' isolation experiment 2500 years ago.
1.1.4. King James IV of Scotland's experiment in the year 1500.
1.1.5. The Babel Tower.
1.2. The Natural Source
1.2.1. People imitated natural sounds to communicate.
1.2.2. Examples: The bow-wow theory, the pooh-pooh theory.
1.2.3. Association of sounds with their meanings.
1.3. The Music Source
1.3.1. Infants are able to create melodies before articulating words.
1.4. The Social Interaction Source
1.4.1. Hums, grunts, groans and curses were used to communicate.
1.5. The Physical Adaptation Source
1.5.1. Focuses on the physical development humans have had to produce speech.
1.5.2. Researchers have found changes in our teeth, lips, mouth, larynx and pharynx.
1.6. The Tool Making Source
1.6.1. As humans' brains developed for toolmaking, they also developed for speech producing.
1.7. The Genetic Source
1.7.1. Our bodies develop as we grow older.