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SlideshowReport

H.M.’s Mirror Tracing Task

Description
The top half of this figure shows the star that H. M. was asked to trace while looking at it through a mirror. The bottom half shows his performance over time with the task. As the graph details, H. M. makes fewer errors on the task the more he practices it, much like you (or we) would. But without a hippocampus and hence the ability to remember having practiced the task before, this improvement came as a big surprise to H. M., who couldn’t figure out why he seemed to be so good at something that seemed like it would be difficult to do for the first time.
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