6 有關逆行性失憶（retrograde amnesia）的敘述，下列何者正確？
(A)無法回憶起兒時發生的事
(B)無法學習任何新事物
(C)不具情境脈絡的知識結構通常相對完好
(D)不會同時合併視覺空間缺損

參考書目：
Lezak, M. D., Howieson, D. B., Bigler, E. D., & Tranel, D. (2012).

Neuropsychological assessment (5th ed.). Oxford University Press.

Ch2.  Basic Concepts--CLASSES OF COGNITIVE FUNCTIONS--

Aspectsandelements ofdeclarative memory
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☛A選項因過去記憶的缺損有個時間梯度，遵循first in, last out的原則，
也就是越新的舊記憶(或越靠近導致失憶的事件)越可能遺失。
所以A選項兒時發生的事是有可能記得的，端看過去記憶遺失的範圍。

☛B選項指的是順行失憶的症狀

☛C選項來自Lezak的教科書
內文如下：

An important distinction is between episodic and semantic memory  (Tulving, 2002a).
Episodic memory refers to memories that are localizable in timeandspace,
e.g., your first day in school. Semantic memoryrefers to "timeless and spaceless "knowledge,
forinstance, the alphabet or the meanings of words.

The clinical meaningfulness of this distinction becomes evident in patients who manifest
retrograde amnesia for episodic information extends back weeks and even years,
although their semantic memory—fund ofinformation,language usage,andpractical knowledge
—may be entirely intact (Warrington and McCarthy, 1988).

☛D選項找不到出處(感覺跟特定的腦區缺損或疾患有關)，知道的麻煩補充一下~
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♚Lezak讀本各章節重點整理
https://pse.is/3lumfu