... much memory is stored by each. The sensory register is a short acting memory store for the sensory record of the stimulus. There is no meaning to the stimulus at this point. From this store the stimulus information passes to the next store, the short term memory store. Peterson and Johnson (1971) showed that information in the STM is stored in an acoustic format and also that the duration that information can be stored in the STM is limited. Peterson and Peterson (1959) estimated this duration to be 6-12 seconds before the memory starts to decay and also that STM capacity is limited. For the memory in the STM store to become a Permanente memory, the information must pass to the long term memory store, which is apparently limitless. This model of multi-store memory was challenged by Craik & Lockhart (1972), who replaced it with the concept of levels of processing. ...

See this essay or coursework document in full right now