Right Side - Left Side
Each hemisphere of the brain is dominant for other behaviors. For example, it appears that the right brain is dominant for spatial abilities, face recognition, visual imagery and music.
The left brain may be more dominant for calculations, math and logical abilities. Of course, these are generalizations and in normal people, the two hemispheres work together, are connected, and share information through the corpus callosum. Much of what we know about the right and left hemispheres comes from studies in people who have had the corpus callosum split - this surgical operation isolates most of the right hemisphere from the left hemisphere. This type of surgery is performed in patients suffering from epilepsy. The corpus callosum is cut to prevent the spread of the "epileptic seizure" from one hemisphere to the other.
The right side of the brain controls muscles on the left side of the body and the left side of the brain controls muscles on the right side of the body. Also, in general, sensory information from the left side of the body crosses over to the right side of the brain and information from the right side of the body crosses over to the left side of the brain. Therefore, damage to one side of the brain will affect the opposite side of the body.
In 95% of right-handers, the left side of the brain is dominant for language. Even in 60-70% of left-handers, the left side of brain is used for language. Back in the 1860s and 1870s, two neurologists (Paul Broca and Karl Wernicke) observed that people who had damage to a particular area on the left side of the brain had speech and language problems. People with damage to these areas on the right side usually did not have any language problems. The two language areas of the brain that are important for language now bear their names: Broca's area and Wernicke's area.
Roger Sperry (who won the Nobel prize in 1981) and Michael Gazzaniga are two neuroscientists who studied patients who had surgery to cut the corpus callosum.
These studies are called "Split-Brain Experiments". After surgery, these people appeared quite "normal" - they could walk, read, talk, play sports and do all the everyday things they did before surgery.
Only after careful experiments that isolated information from reaching one hemisphere, could the real effects of the surgery be determined.
Dr. Sperry used a tachistoscope to present visual information to one hemisphere or the other.
The tachistoscope requires people to focus on a point in the center of their visual field. Because each half of the visual field projects to the opposite site of the brain (crossing in the optic chiasm), it is possible to project a picture to either the right hemisphere OR the left hemisphere.
cc So, say a "typical" (language in the LEFT hemisphere) split-brain patient is sitting down, looking straight ahead and is focusing on a dot in the middle of a screen. Then a picture of a spoon is flashed to the right of the dot. The visual information about the spoon crosses in the optic chiasm and ends up in the LEFT HEMISPHERE.
When the person is asked what the picture was, the person has no problem identifying the spoon and says "Spoon." However, if the spoon had been flashed to the left of the dot (see the picture).
, then the visual information would have traveled to the RIGHT HEMISPHERE. Now if the person is asked what the picture was, the person will say that nothing was seen!! But, when this same person is asked to pick out an object using only the LEFT hand, this person will correctly pick out the spoon. This is because touch information from the left hand crosses over to the right hemisphere - the side that "saw" the spoon. However, if the person is again asked what the object is, even when it is in the person's hand, the person will NOT be able to say what it is because the right hemisphere cannot "talk." So, the right hemisphere is not stupid, it just has little ability for language - it is "non-verbal."
Do you know?
We offer a simple test to see which side of your brain is in control. All you need to do is stare at the image of the spinning kitty for 30 seconds.
What do you see?
Is it rotating clockwise our counter-clockwise?
Maybe it goes in one direction initially, and then changes suddenly to go the other way.
According to the Mind Motivations test:
If you see a clockwise rotation, you are a right-brain thinker.
If you see a counter-clockwise spin, you are a left-brain thinker.
Do you see the image going both directions…or would you like to try and make it spin both directions?
Some people do see both ways, but most people see it only one way. See if you can make her go one way and then the other by shifting the brain's current. BOTH DIRECTIONS CAN BE SEEN. If you look away, It may switch from one direction to the other.
Experimentation has shown that the two different sides, or hemispheres, of the brain are responsible for different manners of thinking.
Most individuals have a distinct preference for one of these styles of thinking. Some, however, are more whole-brained and equally adept at both modes. In general, schools tend to favor left-brain modes of thinking, while downplaying the right-brain activities.
Left-brain scholastic subjects focus on logical thinking, analysis, and accuracy.
Right-brained subjects, on the other hand, focus on aesthetics, feeling, and creativity.
There is a lot of research showing Soroban (Abacus) Mental Arithmetic training can help create unity between the left and right sides of your brain. This can be quite useful to 'exercise your mind' so to speak. Promoting unity of thought can help create more clarity in your decision making processes. This means you will neither 'over-think' about things too much with your left brain - or - be 'too creative' with decisions that require logical analysis with your right brain.
Click here for evidence and scientific researchs