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BearCh20-ACRQedt - Chapter 20 Language Answers to Chapter...

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Chapter 20 – Language Answers to Chapter Review Questions Page 1 of 4 Copyright © 2007. Lippincott Williams & Wilkins. Ancillary material to accompany Bear et al.: Neuroscience: Exploring the Brain, 3e Question 1: How is it possible for a split-brain person to speak intelligibly if the left hemisphere controls speech? Isn’t this inconsistent with the fact that the left hemisphere must direct motor cortex in both hemispheres to coordinate movements of the mouth? Answer: Some midline features are represented in both sides of the brain, such as the fovea, which is represented in both right and left hemispheres. Motor control of the mouth and larynx may be similarly represented on both sides of the brain. In addition, the motor system works according to the population code rather than a strict one-to-one correspondence between neural activity and neural output. This may “loosen” the topographic relationships between motor cortex and motor output. Finally, the two hemispheres can communicate via the anterior commisure in split-brain individuals because this subcortical fiber tract remains intact when the corpus callosum is severed. Question 2: What can you conclude about the normal function of Broca’s area from the observation that there are usually some comprehension deficits in Broca’s aphasia? Must Broca’s area itself be directly involved in comprehension? Answer: Functional localization is an appealing and important concept that helps us understand how the nervous system processes sensory information and commands motor output. But it is important not to lose sight of the interconnectedness of various brain structures. The predominant function of Broca’s area is language expression, and this function is diminished when Broca’s area is lesioned. But the entire circuitry of language processing must also be
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