Amnesia
There are two main forms of amnesia: retrograde and anterograde. Retrograde prevents recall of information encoded before a brain injury, and anterograde prevents recall of information encountered after a brain injury.
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"Cognitive Psychology and Cognitive Neuroscience/Memory."
http://en.wikibooks.org/wiki/Cognitive_Psychology_and_Cognitive_Neuroscience/Memory%23Amnesia
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