๐ฑ. ๐ฆ๐จ๐ฃ๐ฃ๐ข๐ฅ๐ง๐๐ก๐ ๐๐ฉ๐๐๐๐ก๐๐:
A study of an individual with a memory disorder, referred to as HM, supports the MSM.
HM underwent brain surgery to relieve his epilepsy, however as the surgery procedure was still in infancy, both of his hippocampus were removed (central part to memory function).
When his memory was tested in 1955, he thought the year was 1953.
His LTM was tested repeatedly but never improved with practice. However, he performed well on tests of immediate memory span.
This reinforces the MSM's point of there being two separate memory stores for ST and LT memory.