This article basically addresses the evolutionary hypothesis of how the brain became divided in function. The hypothesis states that left hemisphere of the brain evolved to control behaviors associated with repeated patterns and the right hemisphere evolved to control emotional, social, and unexpected stimuli.
The article claims that the left hemisphere evolved to control the right side of the body due to hunting preferences in prehistoric animals. The animals mainly attacked prey from the right side of the body using the right side of the face (mouth and eye) to detect prey. This could be an explanation of why so many people are right-handed.
The right hemisphere of the brain evolved to deal with every other stimuli the ancient animal received. Most of the stimuli caused an emotional response. The theory claims that most animals watched predators with the left eye mainly and could also detect details of related species and distinguish between friend or foe.
Scientist conducted a research to test the specializations of the left and right hemisphere. A letter "H" made by many small letter "A's" was to be recognized by people with different brain injuries. People with damage to the left hemisphere could only recognize the letter "H" without the small A's. People with damage to the right hemisphere could only recognize the small letter A's. Patrick Ryan
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