The fact that the activation of the brain in the overlapping areas of the bilingual’s two languages
does not mean that the functions or the neurons are not separated. The parts of the brain that are
concerned with the brain are located in the perisylvian cortex that is found in the left hemisphere
of the brain. There is both a neuronal and functional separation of the two languages. The
situation is noted when a bilingual individual suffers from brain damage. In such a case, the
person may lose one language and retain the other. In the case where there was no separation,
then it means that the individual could lose all the two languages at once or the individual may
retain both. The fact that the two different languages are perceived differently means that there
are both neuronal and functional differences in the two languages.
Some studies have also
shown that the bilingual people that have suffered brain damage may recover all the languages,
may lose one language, or they may speak a mixed language during the recovery process. The
difference is even bigger in the bimodal bilinguals or the people who speak one sign language
and one oral language. There is a difference in the way the sign language is perceived and the
way the oral language is perceived. An understanding of this concept is important because it
helps in understanding the process of communication and language development as a whole for
the benefit of society (Blanco-Elorrieta, Emmorey & Pylkkänen, 2018).
The main methods of brain mapping that involve language impacted the study of the
neurological nature of language because they give information on the exact part of the brain that
is stimulated during the perception of the languages. It helps in understanding how the brain
manages to perceive two languages perfectly and aids the person in question to communicate
without any problem. The cortical stimulations studies may be used in the treatment of epilepsy.
The cortical stimulation has supported the dual system of the brain and lateralisation. The studies
that have been conducted with regards to cortical stimulation have featured people who were not
neurologically intact which means that the researchers should come up with a plan where they
will be able to carry the same test among the people who are neurologically intact as a way of
confirming the results. In the study of the divided visual field paradigm studies, the anatomy of
the visual system is assessed, which can be used in studying the perception of sign language. The
visual information that is perceived by the brain is directed to the hemisphere that is located
opposite to the stimulated half field. The lateralized stimuli affected the ability of an individual
to move the eye. It is therefore observed that there are many parts of the brain that have to be
stimulated for a person to perceive the visual stimuli. First of all, the person should be able to
open the eyes to see then perceive whatever he or she sees before it can be interpreted
appropriately. Brain mapping, therefore, enables the neuroscientists to understand more about the
complexity of the brain. They may then use the knowledge in coming up with the necessary
interventions to treat some of the brain problems that the people face in society. Many mental
cases go unattended because of the lack of the necessary technology and skills to deal with them.
It, therefore, means that the idea of brain mapping may be utilised to come up with a variety of
solutions to the speech problems as well as the other problems that are affecting the brain
(Marian, Spivey & Hirsch, 2003: Ahlsén, 2006).
Marian, V., Spivey, M., & Hirsch, J. (2003). Shared and separate systems in bilingual language
processing: Converging evidence from eyetracking and brain imaging. Brain and
language, 86(1), 70-82.
Blanco-Elorrieta, E., Emmorey, K., & Pylkkänen, L. (2018). Language switching decomposed
through MEG and evidence from bimodal bilinguals. Proceedings of the National Academy of
Sciences, 115(39), 9708-9713.
Ahlsén, E. (2006). Introduction to neurolinguistics. John Benjamins Publishing.