![]() ![]() If there is such a distinction, STM deals with simply holding information in memory "As-Is", and WM deals with the ability to perform mental operations on it (such as comparison to other stimuli, mental rotation, re-ordering, etc.).īackwards memory span and N-back are usually considered tests of WM, while forwards memory span and free recall are considered tests of STM.Īs a side note: if you are interested in improving learning/teaching methodologies such as the schedule of classes, I'm not sure why you are interested in measuring STM. The distinction between STM and WM is not really clear. You should also be aware of the close term Working Memory (WM). ) and is still used in current research (e.g. This task has been used for a long time (e.g. N usually starts at 2, and increases as the participant performs better. N-Back: a stream of stimuli is presented, and the participant has to respond whenever the stimulus presented is identical to the stimulus presented N steps ago. This variant is essentially identical to the Memory span described above, except the lists used are usually of constant length, and not successively longer as in the memory span task. Note that there is another variant of the task that is called Serial Recall, in which participants have to recall the items in the order in which they were presented. After the presentation ends, the participant has to recall, in any order, as many items as possible from the list. The WAIS test battery has an implementation of both, along with a standardized scoring method.įree Recall: a list of stimuli (usually nouns) are presented. Another common variant is called Backwards Digit Span, in which the participant has to repeat the list in backwards order. The most common variant is called Digit span, in which the items in the lists are spoken digits. Memory span: lists of items are presented sequentially and the participant has to repeat each list after it ends.There are several commonly used measures of Short Term Memory (STM). ![]()
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