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... medium or low) to prompt them to recall the top middle or bottom line. Participants could do this easily if they recalled immediately but the image faded rapidly, lasting no more that one-quarter of a second. In the way, Sperling was also able to show that the short-term sensory store hold 5-9 items. Short term memory. * Lasts up to 30 seconds * Capacity 7+2 items * Information lost through interference or decay. * Holds information as images, sounds or meanings. Information selected for further processing passes from the short term sensory store into the STM. It is thought that STM holds information in the form of images sounds or meanings. Inforation is STM is kept 'alive' by rehearsing (repeating) it. Two pieces of evidence about life span and capacity of STM: * Peterson and Peterson (1959) gave participants a consonant trigram to remember (e.g. KDL) and then a large number. To prevent ...