Sometimes, people also experience transient retrograde amnesia, forgetting some portion of their previous memories.
也有患者会体会到后退式的遗忘，他们会忘掉之前记忆的一部分。
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Amnesia can be caused by damage to areas of the brain that are vital for memory processing. Unlike a temporary episode of memory loss (transient global amnesia), amnestic syndrome can be permanent.