If children are born into multilingual households, they learn all the languages they are regularly exposed to. Infants can learn three or four languages or more. In the process of learning to speak, there are strong relationships between speech, song and music. Areas of the brain that are primarily concerned with music and language overlap considerably. (Robinson, Ken, Sir, PhD. Out of Our Minds. p 130-131. NY: Capstone Publishing Ltd, 2001, 2011)

For most people, whether they are left- or right-handed, language abilities are sited in the brain’s left hemisphere. People who learn a second language after early childhood tend to process the second language in the right hemisphere. (Restak, Richard, MD. The Secret Life of the Brain. p 48. Washington D.C.: The Dana Press and Joseph Henry Press, 2001.)

Two main language areas—Wernicke’s and Broca’s—have been recognized for more than a century, but brain imaging has shown other areas that are involved such as the insula that lies within the Sylvian fissure that divides the temporal and frontal lobes. Each main area of language cortex is probably split, like the sensory cortices, into many different processing regions and subregions. (Carter, Rita, Ed. Mapping the Mind. p 149. CA: University of California Press, 1998.)

Study: Language related to conceptual thought is processed in left hemisphere (e.g., sedate the right hemisphere and the person can speak normally but can’t sing). (Storr, Anthony. Music and the Mind. p 34-36. NY: Ballantine Books, 1992.)

While articulation and grammar are seated in Broca’s area on the left side (of the brain), the emotional tone of phrasing and voice derive from the right side of the brain. (Wonder, Jacquelyn, and Priscilla Donovan. Whole Brain Thinking. p 9. NY: Ballantine Books, 1984.)

Generally, linear Western languages appear to be housed in the left hemisphere. Eastern languages and some dialects appear to be housed in the right hemisphere. This means that a brain injury in one side of the brain may interfere with one language while leaving use of the other language intact. (Joy, Donald, PhD. The Innate Differences Between Males & Females (Audio Cassette). CO: Focus on the Family.)

In most people (97%), both Broca's area (spoken speech) and Wernicke's area (heard speech) are found in only the left hemisphere of the brain. (Chulder, Dr. Eric. The Brain and Communication. Think Quest.)

Language, the most obviously lateralized of skills, is atypically organized in about 5% of people. The two hemispheres really do have quite specific skills that are hard-wired to the extent that, in normal circumstances, certain skills will always develop on a particular side. Almost every mental function you can think of is fully or partly lateralized. (Carter, Rita, Ed. Mapping the Mind. p 35-38. University of California Press, 1998.)

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