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He woke up in a cloud — he felt as if he had been “dropped cold, empty, neutral, cleansed,” as he later put it — with retrograde amnesia.

“There are many alternative explanations for these correlations—say, retrograde amnesia, in which the forgetting is due to a brain injury.”

Still, the overdose left Clark with brain damage and retrograde amnesia.

While in prison, Madison suffered several strokes in recent years, resulting in brain damage, dementia and retrograde amnesia, court papers said.

The first, retrograde amnesia, was for events that occurred before my brain injury.