... brain controls most of the functioning of the right side and is also involved with the specialisation of language. Whereas the right hemisphere which controls more of the left side of the body is involved with spatial organisation. Therefore damage to the left hemisphere is usually related to difficulties with speech and language (Davis and Wada, 1977). And damage to the right hemisphere can lead to problems associated with expression and the comprehension of visual patterns (Kalat, 1998). Research evidence has shown that when the human brain is tasked to process two separate pieces of information simultaneously which involves the same cerebral hemispheres there is an interference which occurs resulting in a loss of ability to carry out a particular task competently (Kinsbourne and Cook, 1971). If the brain is to perform a concurrent activity which involves the use of just one of the cerebral hemispheres; such as balancing a dowel rod ...

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