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The nervous system refers to an organism鈥檚 control center; this organ system monitors, processes, and regulates all the activities of the body. The nervous system is broadly grouped as peripheral (PNS) and central nervous systems (CNS).

The organ of the nervous system (specifically, the CNS), which is responsible for all the controlling actions, is referred to as the brain. This organ is situated at the topmost region of the body, and different regions of the brain are specialized for the control of different body functions.

The individual suffered an injury to the left cerebral hemisphere, and due to this, they lost the ability to generate sign language or represent their thoughts. There can be two possible explanations for this symptom.

The injury might have affected the Broca region, which is known for controlling speech production and gestures related to speech. As a result, the person develops Broca鈥檚 aphasia and could follow speech but is unable to generate them.

The disfunction in the generation of sign language can also be due to the development of Parkinson鈥檚 disease.The injury might have affected the motor cortex neurons and caused an inability to generate sign languages as motor activities are hampered.

Among the two possible causes (Parkinson鈥檚 disease and Broca鈥檚 aphasia), the Broca鈥檚 area will display difficulty only in generating sign language, and other motor activities will be unaffected. In contrast, Parkinson鈥檚 disease would affect the overall functioning of the limbs and cause tremors.