Psychology 9-1 GCSE - 2.1.5 Understand the structure and process of memory through the Multi-store Model of Memory (Atkinson and Shiffrin, 1968), including strengths and weaknesses of the theory: Multistore-model of memory - a) Sensory register - Duration is 1/4 to 1/2 a second. Capacity is all sensory experience. Encoding is sense specific. This is where you register the environmental input. b) The capacity of short term memory - STM (short term memory) - 7 plus or minus 2 items can be stored in short term memory at one time. c) The Duration of short-term memory - STM (short term memory) - Duration of information held in short term memory seems to be between 15 and 30 seconds, but the duration you can hold it here depends on the type of information it is. STM holds primarily acoustic encoded memories (sound). d) The capacity of long term memory - LTM (long term memory) - Capacity for long term memory, as ...