The model of Brain Mapping followed by us is based on the ratio analysis of the strength of the 5 lobes of the hemisphere. Modern theories of Neurogenesis exhibits scope of growth in neuro- cells even in the mid-age group. The habituation of a particular behavior develops concerning intelligence.
Whatever be the extent of growth for intelligence we observe in a brain but that will always be following the same ratio of strength which we discover during the study of lobes (at a broader level). For example ratio of visual function (occipital lobe) is low in comparison with auditory function (Temporal lobe) in a brain. Now, Lots of exercises provided for the growth of visual function (for a case of study- brain).
Because the structure of the brain gives higher strength (ratio) to auditory function, even if not many exercises are provided to it, the functioning of the auditory will always be stronger than the visual in some terms at least like the attention of the auditory will be higher than the attention of visual sense.
Here we see a huge gap. An individual is aware of the result/ performance of a sense/area of the brain on which he/she has worked but left unaware about the actual strength of the other sense/ area of the brain which could be even stronger. Brain Mapping provides you with such details, indicators, and focuses points. Clubbing them together you get key to success.