MSM

• Another strength is the supporting evidence from case studies that STM and LTM are separate stores. For example, HM, a brain damaged patient, was unable to form new LTMs but still had a well-functioning STM. He could read the same magazine over and over again and not remember it or remember a conversation that he had an hour ago. But, he did perform well on tests of immediate memory span (STM).
• However, there is contradictory evidence for the STM store in the MSM model. For example, Shallice and Warrington studied patient KF who had amnesia and found that their STM for digits was very poor when read out loud to him but his recall was much better when he read them himself.
• Furthermore, another limitation is the use of artificial materials. For example, most studies that provide support for MSM used artificial stimuli such as digits, letters and sometimes words. They also used consonant syllables that have no meaning.