Hemispherical Lateralization Psychology

Discussion Response: Hemispherical Lateralization Psychology

Hemispherical lateralization is the distinction of the functions undertaken by both the left and right hemispheres of the brain. As such, lateralization is important in that it affects language believed to be a heavily lateralized function (Catani & Thiebaut de Schotten, 2012). The Borca’s area is responsible to producing speech, and involves a wider network than was previously assumed. The Broca’s area of Robert’s brain is damaged to explain the production or expressive aphasia. Damage to Broca’s area leads to global aphasia, which in Robert’s case, combines with the right sided paralysis that impairs his ability to understand or produce speech.

Researchers, including Wernicke and Broca, have demonstrated that most people’s language centers are lateralized to the left hemispheres (Catani & Thiebaut de Schotten, 2012). Robert’s paralysis confirms that in his case, his right size is paralyzed. It goes to show that there is a lateralized damage to the left sphere. The impact the stroke Robert had was that it led to his paralysis of his right side of the body though he could move his left arm and the leg with ease. Moreover, it was observed that in as much as he clearly could comprehend what was being said to him, he was not able to produce speech.

Last, Wernicke’s area interprets speech, and damage to the area can lead to receptive or sensory aphasia (Catani & Thiebaut de Schotten, 2012). From the case, Robert understands speech, meaning that Wernicke’s receptive aphasia that damages the left hemisphere is not a positive diagnosis. Therefore, evidence that suggest the contrary is misleading. Given that language centers are lateralized by damage impairment to the left hemisphere, Robert has lost control of muscles on the right side of the body. Where brain damage leads to speech problems and a paralysis of body muscles, the diagnosis is a right sided paralysis.


First, the damage to the connection between the brain and the speech as well as locomotory movement on the right side resemble damage to the localized region tasked with a particular function. The evidence shows that the damage to the localized regions of Wernicke and Broca has created global aphasia in Robert. The study affirms claims that language production is not confined to Broca’s area alone. As such, language and cognition involve networks in the brain region and are not confined to specific areas.



















Catani, M. & Thiebaut de Schotten, M. (2012). Atlas of Human Brain Connections. New York: OUP Oxford.


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