NVS- 2025
Applied Physiology
Easy
Damage of which region of brain markedly impairs the understanding of speech and written language?
Appeared in: NVS- 2025
Explanation
- Wernicke's area, located in the temporal lobe of the dominant hemisphere (usually the left), is the principal region for processing and understanding language.
- It is responsible for the comprehension of both spoken and written words, making it the brain's primary language reception center.
- Damage to this area leads to receptive aphasia, where a person can hear words and see text but cannot derive meaning from them.
- Speech may be fluent in terms of rhythm and grammar but is often filled with incorrect or invented words, reflecting a deficit in language formulation and comprehension.
Why Other Options Were Wrong
- Option A: The prefrontal lobe is primarily associated with executive functions, such as planning, decision-making, personality expression, and moderating social behavior, not the primary comprehension of language.
- Option B: The right parietal lobe in most individuals is part of the non-dominant hemisphere. Its functions are mainly related to visuospatial processing, navigation, and understanding non-verbal cues, not language comprehension.
- Option C: While the left parietal lobe is involved in language, particularly the angular gyrus which helps in reading, Wernicke's area is the more specific and primary center for the comprehension of both spoken and written language. Wernicke's area is located in the temporal lobe, adjacent to the parietal lobe.
Related Visual
Clinical Relevance
- Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Localization of Language Function in the Brain as background academic context rather than a clinical decision trigger.
- Nurses must be able to differentiate between types of aphasia to communicate effectively. For a patient with Wernicke's aphasia, using simple, short sentences, gestures, and visual aids is more effective than speaking louder or repeating complex phrases.
- Assessing a patient's ability to understand and follow commands is a critical nursing function, especially after a stroke or head injury, as it can indicate the location and extent of brain damage.
- Patient safety is a major concern. A patient with receptive aphasia may not understand instructions about medication, activity restrictions, or safety precautions, requiring the nurse to implement alternative communication strategies and increased monitoring.
How to Approach the Question
- First, identify the core function described in the question stem: 'understanding of speech and written language.' This points to a receptive language function.
- Next, review the options, which are different regions of the brain.
- Recall the primary functions of each brain area. The prefrontal lobe is for executive function, and the parietal lobes are largely for sensory and spatial processing.
- Differentiate between the two major language centers: Broca's area (speech production) and Wernicke's area (language comprehension).
- Since the question is about 'understanding' (comprehension), Wernicke's area is the most specific and correct answer.
- Eliminate the other options based on their primary roles, recognizing that while the left parietal lobe is involved in language, Wernicke's area is the central hub for comprehension.
Concept Tested & Keywords
- Concept Tested: Localization of Language Function in the Brain
- Stem keywords: brain damage, understanding of speech, written language
- Lead-in keywords: which region
- Negative lead-in flag: false
Question ID
Q74uS7GtgATMtYB76MAZqD
Reference Book
E6 Psychology Morgan King 9e Part 1 p. 88-90
E6 Robert Boland, Marcia L. Verduin - Kaplan and Sadock's Comprehensive Text of Psychiatry-Wolters Kluwer Health (2024) (pp 1-16525 of 16525) p. 3339-3341
Practise the full NVS- 2025
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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