The drastic limitation of short term memory compared to the vast capacity of long term memory has led to a ”bottleneck” model of human memory, where any information must pass the narrow working memory before it is either forgotten or stored in long term memory. In contemporary models of the working memory, there is also visuo-spatial sketch pad which handles non-symbolic information such as images and spatial information. This task is relying heavily on an articulatory control process which is used for verbal rehearsal which was traditionally considered as the short term memory. If the reproduction should be in reverse order, the executive control function is more prominent since the items must be re-ordered. The length of the last correctly reproduced sequence is the estimate of the memory span. Sometimes working memory is also called short-term memory since it. The test is aborted when the subject failed to reproduce two consecutive sequences. The digit span test allows us to better understand the effectiveness of working memory. Digit Span is a test of verbal short-term memory. Most people manage to recap around seven digits. Right afterwards, the test subject has to recall the correct digits in the same order. The length of the series is increased with each correct reproduction. Digit Span Test (Online Tool) The digit span test is a way of measuring the storage capacity of a person’s working memory: A testperson is visually or auditorily exposed to a sequence of digits one after the other. The digit memory span test measure how many digits a subject can reproduce from a series of digits presented to them. The limitation of working memory to hold discrete units to an amount of 7 ± 2 items is called memory span and is a well proven finding in the field of cognitive research.
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