![]() Human memory and the medial temporal region of the brain (Ph.D.). "The Corsi Block-Tapping Task: Standardization and Normative Data". This indicates that the backward Corsi block tapping uses specific spatial processes. In a study with visuospatial learning disabled (VSLD) children, they found that only the VSLD children had significantly impaired performance on the Corsi backward task as compared to the forward, while both the control group and the VSLD group showed poor performance on the digit span backward compared to the forward. The backward Corsi block tapping task has also been used in studying the differences in the processes used between the Digit Span forward and backward and the Corsi block tapping forward and backward. For example, in a study done on the Corsi block tapping task and the digit span task both forward and backward, researchers found that although the backward version of the digit span task was significantly harder than the forward, there was no significant difference between the forward and backwards version of the Corsi block tapping task. In the backward task, the subjects are asked to watch the sequence and instead of mimicking the researcher's pattern, they are asked to repeat the sequence in backward order.Īlthough the format of the forward and backward Corsi block test are analogous to the forward and backward forms of the digit span task (which tests verbal memory span rather than visuo-spatial memory span), the backward Corsi block tapping test differs from the backwards digit span task in its relative difficulty. The backward Corsi block tapping is a slightly altered version of the original Corsi block tapping task. The Corsi block tapping task is used to test a variety of things including memory loss, testing of brain damaged patients, spatial memory, and nonverbal working memory. When the sequence to be recalled becomes longer than three or four items, central executive resources are used. Corsi blocks tasks with a normal forward order requires support from the visuospatial sketch pad, but not from the phonological loop. Whether able to perform the task well or not the ventrolateral prefrontal cortex is highly involved. So while humans may show encoding difficulty, this is not related to overall brain activation. An fMRI study involving subjects undergoing this test revealed that while the sequence length increases, general brain activity remains the same. This number is known as the Corsi Span, and average is about 5-6 for normal human subjects. It was based on the digit span task, but instead of the verbal form of the Digit Span, it required the use of visuo-spatial memory. The subject was required to point at the blocks in the order they were presented, or "tapped". The Corsi block tapping task originated in the early 1970s as a set of 9 identical wooden blocks positioned on a board. This number is known as the Corsi Span, and average is about 5-6 for typically 'normal' human subjects. The sequence starts out simple, usually using two blocks, but becomes more complex until the subject's performance suffers. It involves mimicking a researcher as they tap a sequence of up to nine identical spatially separated blocks. The Corsi block-tapping test is a psychological test that assesses visuo-spatial short term working memory. The yellow symbolizes the current block in the sequence.Īssesses visuo-spatial short term working memory Digit repetition performance does appear to be related to both general intellectual ability and to performance on the Wechsler Memory Scale.This is an example of the computer version of the task. Although the current data regarding visual constructive deficits and impaired ability to repeat digits backward is inconclusive, there did not appear to be a strong relationship between these two functions for these patients. No difference was found in the performance of patients with right or left hemisphere lesions however, the low incidence of aphasia (8%) in this sample may account in part for the relatively adequate performance by the left hemisphere patients. These data indicate that digit span forward is a more sensitive measure of brain dysfunction from focal brain lesions. Approximately 60% of all brain-damaged patients showed an impairment of digit span forward, while only 5% showed a similar impairment on the digit span backward task. Correlational data of digit span performance and various intellectual, memory, and constructional measures was examined. The incidence of significantly impaired digit repetition performance and the incidence of large forward and backward digit span discrepancies were also studied. Digit span forward and backward was investigated in well-matched samples of patients with discrete quadrant brain lesions. ![]()
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