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© 2001 Stephen Holland --- sholland@softwaves.net

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12. Talents in the Left Brain


The Left "Human" brain

The right brain is the "animal brain" and analyzes the environment for the sights and sounds useful for survival. In essence, animals are almost 100% "right-brained." Humans have kept the animal talents on the right side, but have modified the left brain for language and tool use.

The following is a summary of talents found in the left brain. Each talent is a complex network of different processes beyond what is mentioned here, but injuries or strokes in these areas would result in serious loss of these specific talents.

Language Sounds

Sound input in the human left brain is specialized for discriminating the sounds of language. As children grow in the first few months, their sound patch in the temporal lobe is hearing the sounds of people talking, and remembering that certain sound patterns seem to always match certain objects and actions.

Animals do have a limited symbolic vocabulary, and can communicate concepts with certain sounds. The song sparrow in the tree near our house sings a very definite song, which other song sparrows, out of sight, can translate as meaning that he is claiming territory. This is definitely using a specific sound as a symbol to communicate a real world concept. In contrast, a dog growling and baring its fangs is not being very subtle or symbolic.
(Click here for a song sparrow territorial call -- 92 kb .wav file.)

Humans can make very fine distinctions in sound, and therefore meaning. For example we can distinguish the difference in sound of "sat" and "sad." Instead of one bird song meaning "territory," we have pages of words on a real estate contract. (If complexity of vocabulary and grammar is a measure of human evolution, then this implies that, on the average, left-brained women who talk a lot are more "human" than most men who do more grunting, and lawyers, poets, and talk-show hosts may represent more evolutionarily advanced, human careers.)

Books give children exposure to much more complex vocabulary, and proper grammar, than children will ever hear from oral language in normal family or school life. This is especially true if parents read to the children, which gives young children access to language and ideas years ahead of their own reading ability. Read, read, read!!!!



Vision and Reading

ision in the human left brain is specialized for reading. The left brain learns to see arrangements of lines we call alphabet letters.

For example...
  1. The visual cortex looks for simple things such as " l o / "
  2. Then the brain learns to perceive arrangements of lines as letters " d b p q v "
  3. Then the brain learns to perceive arrangements of letters as words
    l o -----> b ----> bat
"Dyslexia" means "can't read," and tells us nothing. There are dozens of causes of dyslexia See the page on dyslexia for more information.


Phonics and Spelling

We think in the sounds of a language -- and can even think with a foreign accent. Reading is merely a visual gimmick tacked onto our oral vocabulary and grammar. It is common to have people who can speak but not read; it is impossible to have a person who can read but not understand the same language when spoken.

Children at age 6 years have a good oral vocabulary and grammar. Also, their visual cortex has usually developed enough to distinguish the visual shapes of letters. Now they are ready for reading.

There is a special part of the cortex, called the "angular gyrus" which has evolved to match sounds with letters. (A "gyrus" is simply a fold in the cortex that bulges up, while a "sulcus" is a valley.) This is the area so important for spelling.
existing oral vocabulary ------> phonics <--- visual perception of letters
||
ability to read

The angular gyrus develops from about age 6 to 9, then it is mostly finished for most people. Done. If children are exposed to good phonics training in the Primary grades, they will tend to be much better at spelling and reading. For example, the term "word attack skills" means using phonics to sound out letters until they trigger a match with the sound of a word already in the brain.

Reading is a code for oral language, and phonics unlocks the code.

(The "whole language" fad that ignored phonics was popular in education in the 1970s and 80s, and resulted in a wave of poor spellers and readers going through the school system. I earned money tutoring them.)


Grammar

Grammar is the spatial sense of vocabulary. This is especially true of English, which developed a relatively simple grammar system that depends upon spatial order much more than endings or gender. In English, we have grammar in our left brain that knows "Boy chases kangaroo" is different than "Kangoroo chases boy." We could also draw pictures in our right brain to symbolically say the same thing:
Left brain words ="Boy chases kangaroo" "Kangaroo chases boy."
Right brain images =

As a child grows, the brain soaks in whatever sounds it hears which we call vocabulary and grammar. After age 10, the vocabulary and grammar parts of the brain are mostly finished growing, and the thinking parts of the brain in the frontal lobe continues growing, building upon the foundation of grammar and vocabulary learned in childhood.
Vocabulary --> Grammar --> Concepts --> Creative thinking

See --- Learning Foreign Languages




Body Senses

Body senses, such as touch, pain and limb position, are similar to the right brain, except that the left brain senses the right side of the body. However, in the left brain they are important for some forms of symbolic thinking (next section).


Symbolic Relationships

The spatial area of the brain, in the parietal lobe, senses complex arrangements. In the left brain, this area works with symbols, not just visual shapes. Examples include...

Right / Left. The body senses tell a child which foot the mother is touching. Vision shows which foot the mother is pointing to. Now the mother says the words, "Put on your left shoe." Eventually the child's brain matches up the word "left" with a certain side of the body. More advanced learning will allow the child to match the word "left" with map symbols and the world of navigation so he can say "According to the map, we should make a left turn." This matches lines on a map with the left side of his body.

My wife had an interesting experience while teaching Kodaly music to children. She taught herself to use the left hand when she said "right" so the young children could mimic her, but afterwards she often got left and right instructions wrong, "Turn left -- no, I mean right."

Reading Clocks. The parietal lobe matches up the sense of time with symbols of a clock face. I once had an intelligent grade 10 student who could not read a traditional clock because he had always used a digital clock as a child.

Math involves a variety of talents. A concept such as "add" must involve a child seeing the difference between one and two cookies on a plate. The parietal lobes on both sides of the brain work together on math. However, the left brain will tend to work harder on algebra (which is a lot like language grammar), while the right brain will do most of the geometry work. Mental arithmetic is strongly in the right brain because symbols must be moved around in a visual-spatial way.


Creative Ideas

The creative area of the left frontal lobe rearranges words, concepts, symbols, and memories into new patterns. In effect, this allows us to think up new things to say.

When we think about something, we are usually using oral language in our mind. We can rehearse a speech, dream of a conversation, imagine a poem, and remember what someone said on the phone. We can even think with a foreign accent. Most of this goes on in the frontal lobe above our eyebrows.

Clues that this area is well-developed are indicated if a person is...
  • "quick-witted" -- making fast associations of ideas and words
  • good at improvising speech -- thinking of "what to say" impromptu
  • good at carrying on an "intelligent" conversation instead of "small talk"
  • good at philosophizing with abstract concepts -- "why do we exist?"




Inhibitions and Worry

The lower frontal lobe, above the eyes, has the job of stopping a person from getting into trouble through wrong actions. On the left side this means not saying the wrong thing at the wrong time. Because most of our thnking is oral language, this area is important for "talking to ourself" and worry.

If the area is too strong, then a person may worry so much that they are afraid to do or say anything. Shyness is a survival mechanism for avoiding trouble.

If it is weakly developed, or injured, a person may say inappropriate things, such as swearing too much or talking too much. Remember, the goal of this area is to keep a person from trouble via the mouth, so if the person is losing friends by what he says, then the inhibition area is not working well.





The Premotor area

The Left premotor area, in upper left front of the forehead, keeps track of sequential patterns -- words, symbols, ideas, that come one after another. This is highly important for humans with symbolic thinking.

The area primarily would have evolved for planning tool use -- how to use tools in a sequential way to accomplish symbolic goal.

Because the motor nerves cross, this left-brain premotor area controls the RIGHT HAND. Humans are "handed" because one side of the brain specialized to do sequential operations. Most humans have symbolic language in the left brain, so most humans are Right-Handed!

Key talents where this area is important include:
  1. Tool use - doing a sequence of operations with the right hand.
  2. "Logical" thinking - putting ideas together in sequence, so one follows another
  3. Cause and effect reasoning - a basis for scientific thinking and "how-to" analysis
  4. Grammar - Thinking, speaking and writing language in a sequential way to follow rules.
  5. Rules for playing Games - what to do in what order, for a logical result. (However, many games like chess also have a strong right-brain component of patterns.
  6. Following recipes and instructions
  7. Awareness of time, and possibly the passage of time in comparison to other events. (For example, when people are using this part of the brain for intensive sequential analysis, such as how to do something on a computer, time awareness seems to fail, and they will say, "I lost track of time."


The Motor area

In the Left-brain, this area puts into practice the instructions from the left-brain pre-motor area, but controlling the Right Side of the body. This of course covers the Right hand.

Because the Left side of the brain is language based, the Motor area also controls strongly the instructions to speak language. (Stuttering may involve confusion between the left and right Motor and Pre-Motor areas trying to control the single language ability.)



The Speech area

This seems to be a highly developed part of the general motor area, which evolved to handle the difficult muscle control needed for speech creation.



Stephen Holland --- sholland@softwaves.net

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