These models are widely related to some biological make-up of victims. The concepts are, therefore, referred to as the biological systems of dyslexia (Wagner, 1973). The theories have been developing as researchers continues to investigate the causes of the disease. Their motivation is derived by their search that could mitigate the disease.
One of the theories that have been placed onward in explaining the occurrence of dyslexia is the Cerebellar Theory (Stein & Kapoula, 2012). The model explains that dyslexia is caused by the malfunction of the cerebellum (Beaton, 2011). The lack of proper functioning of the cerebellum may lead to impairment of the brain and therefore the information may lack a good processing when reading. Theorists to this knowledge came up with the idea after a thorough investigation of the information entering the brain at a given time. When a person has some defects on the brain, the signals sending the message got distorted, and their response fails. The theory also suggests that the brain disorder makes the patient have no room to store what he or she is reading. Even though, they read they lack to comprehend whatever they are reading.
Another concept that explains the existence of dyslexia is an evolutionary model (Stevens, 2010). The theory outlines that dyslexia may occur as a result of a problem during the human evolution. Human being changes their behaviour as they evolve, and their young ones should also develop these changes, failure to which they will be left behind in development. Majority of communities uses speech as a way of communication rather than written methods. The lack of exposure in writing and reading causes dyslexia according to the theory. The theory has similar reasoning with the cerebellar theory in that the symptoms associated are caused by the lack of proper development of cerebellar vestibular. Cerebellar vestibular malfunction, ...Show more