What did you do on March 13th, 1985? People with hyperthymesia (which has been characterized only recently, and of which just a handful of cases have so far been reported) would likely provide a vivid account of what happened on that day. And if this particular date has personal significance for you - if, for example, it was your wedding day, or the birth date of one of your children - then you will probably remember it quite well. But for most of us, the answer to this question is likely to be "I don't know".
In the journal Cortex, researchers describe the case of a patient with severe…
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