The Lateralized Brain

The Lateralized Brain - PNB 2264 The Lateralized Brain...

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PNB 2264 The Lateralized Brain KIMBALL 1 *take a look at slide, different from notes Speech/Language, Stroke and Split Brain Research Two cerebral hemispheres are not mirrors of each other I. Introduction A. Localization of brain functions 1. Correlation of lobes with function 2. Motor/sensory control of the body is such that one hemisphere (e.g., left) controls contralateral side of the body (e.g., right). B. The two cerebral hemispheres are not mirrors of each other. 1. Examples of lateralized functions 2. Cerebral dominance and “handedness” For most people, the left hemisphere is dominant, the person is right-handed, and speech is contained in the left hemisphere. Some left handed people (who as a whole make up about 10% of the population) are truly right- cerebral dominant. Most, however, still contain speech functions in the left hemisphere. II. Neurobiology of speech and language. A. “History” 1. First noted in 1800s that the ability to produce/understand speech resided in the left hemisphere. Broca: discovered that an area in the left posterior frontal lobe controls the ability to produce speech, and that lesions to this area result in expressive aphasia - the inability to express thoughts in either written or spoken language. Also noted: in most people, this function is in the left hemisphere. Wernicke: discovered the area in the temporal lobe that controls comprehension of speech; lesions here produce receptive aphasia - the inability to understand the spoken (or written) word. This function is usually lateralized to the left hemisphere also. III. Some lateralized functions in the brain. A. Left hemisphere 1. Ability to understand and produce speech, reading, and writing. 2. “Logical, analytical, rational”.
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This note was uploaded on 03/19/2012 for the course BIO 2000 taught by Professor Ewr during the Spring '12 term at Alabama.

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The Lateralized Brain - PNB 2264 The Lateralized Brain...

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