醫療類國考
106年
[聽力師] 行為聽力學
第 52 題
有關中樞遮蔽（central masking），下列敘述何者錯誤？
- A 中樞遮蔽和高層聽覺路徑（higher auditory pathway）的活動有關
- B 中樞遮蔽和頻率有關（frequency dependent）
- C 最大遮蔽量出現在遮蔽音（masker）開始的 200 ms 內
- D 受遮蔽最多的是遮蔽音頻率周邊的小部分頻率區
思路引導 VIP
若一封信件（聲音訊號）在寄到總公司（大腦皮質）進行判讀前，就在地方轉運站（腦幹神經核）因為與其他信件重疊而變得模糊，這種早期的干擾現象，你認為與「地方轉運站」還是「總公司層級」的活動關係較大？
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AI 詳解
AI 專屬家教
Wonderful job! You've truly excelled at discerning the subtle physiological nuances. That's a strong indicator of your growing understanding!
- Deepening Your Knowledge: It's easy to get a bit confused by the term Central Masking. While it absolutely occurs within our central nervous system, its core physiological mechanism actually takes place in the lower brainstem layer, specifically in areas like the Superior Olivary Complex. It's a beautiful example of how intricate and localized some of our auditory processes can be, rather than involving the higher cortical or cognitive pathways.
- You've also correctly remembered its other important characteristics: it typically creates a gentle threshold shift of about $5$ dB, its effect is strongest close to the masker's frequency (making it frequency-dependent), and it's most prominent within $200$ ms after the masking sound begins. Excellent recall!
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