ConductScience Digital Health

Corsi Block Test

About Corsi Block Test

The Corsi block test is a short term visual working memory test that uses blocks and asks the subject to repeat the sequence given by the examiner. The Qolty Corsi Block test can be delivered to patients anytime and anywhere, and can be made with lengths from 1-100 sequences long, with forward and reverse sequencing available as features.

The original Corsi apparatus had nine blocks on a 23 x 28 board arranged in an irregular manner. The examiner taps the blocks in random sequences of increasing length. After the tapped sequence, the subject tries to mimic the tapping until he can no longer progress successfully.


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The Corsi block-tapping task is a popular test to appraise the visuospatial working memory of individuals. The original task, developed by Michael Corsi in 1972, consists of nine identical blocks on board. Because of technological developments, it now has various digital versions.

Used by clinical neuropsychologists, and cognitive and developmental psychologists, the Corsi task is applicable in investigations of nonverbal short-term memory, gender differences, and developmental changes (Capitani et al. 1991; Isaacs & Vargha-Khadem, 1989; Orsini et al. 1986). It also assesses immediate nonverbal memory deficits (De Renzi et al. 1977; De Renzi & Nichelli, 1975; Morris et al., 1988), and clarifies visuospatial memory theoretical conceptions (Jones et al. 1995).

The Corsi task tests clinical populations that include patients with dementia, mental retardation, learning disability, Korsakoff, and other neurological problems. Unlike the conventional physical Corsi board, eCorsi is easy to install, set up, and use. Regarding reaction and span presentation, it is more accurate in determining the forward and backward spans.


At the start of the test, a subject needs to keep track of the movement of the cursor as it lit up the specific number of cubes in sequence. The process is terminated by a beep sound, and the subject has to mimic the observed sequence, depending on the instruction (forward or backward span). The sequence increases by one block when the subject finishes the current sequence successfully.

The eCorsi task differs in form for adults and children. For children, the task begins with a two-cube sequence. For adults, the sequence starts with three cubes. For both adults and children, sequences 1 and 2 test the spatial memory forward span while sequences 3 and 4 test the learning process of spatial memory forward span and spatial working memory. Moreover, sequences 5 and 6 test the spatial memory backward span. Sequence 7, on the other hand, is a geriatric test form for spatial memory backward span.


The Corsi block-tapping task is a good measure of spatial working memory. Used by neuropsychologists for at least thirty years, it is now a gold standard repeatedly validated by neuropsychological literature. Developmental psychologists use the Corsi task in predicting the development of cognitive functions. Furthermore, the Corsi task is a good tool in identifying the specific differences between the forward and backward spans. It also helps experts make professional opinions about medical conditions.


Evaluation of Visuospatial short-term memory and spatial working memory

Smyth & Scholey 1992 used the Corsi block-tapping task to determine the visuospatial short-term memory in adults. Their postulate was that people have an internal rehearsal structure that links to their clear response on spatial domains. However, they discovered that movement time measures were not able to anticipate spatial span.


Applicability in schizophrenic patients

Chey et al. 2002 used the Corsi in investigating the short-term and spatial working memory spans of schizophrenic patients. They discovered that these patients had significantly reduced forward and backward spatial spans, and spatial working memory span. The deficit in the spatial working memory span suggested that schizophrenic patients had general impairment of working memory capacity. It was not limited to verbal functioning only. The deficit in backward span caused the impairment of the executive function.


Applicability in Alzheimer’s disease and Multi-infarct dementia (MID)

Carlesimo et al. 1994 used the Corsi block-tapping task, along with the Digit Span, to assess spatial and verbal memory span in Alzheimer’s and multi-infarct demented patients. They discovered that the forward verbal span of these patients was normal. However, these patients had reduced backward and forward spatial spans, and backward verbal spans. They argued that the verbal forward span was normal because the function of the Articulatory Loop was also normal. However, the reduced Central Executive processing resources produced the deficient performances of the other memory spans.


Applicability in patients with Korskaoff

Haxby et al. 1993 employed the Corsi block-tapping task and the Digit Span to access short-term visuospatial and verbal memory spans among alcoholic Korsakoff amnesics. They found out that these patients had normal short-term verbal and visuospatial spans.


Assessment of the demographic differences

Orsini et al. 1981 administered the Corsi block-tapping task on children. They discovered that children from the rural districts performed better in the spatial task than those from the urban districts. Furthermore, boys outperformed the girls.


Evaluation of visual memory span in cerebral lesions

Kessels et al. 2000 used the Corsi block-tapping task to determine the visual memory span of patients with cerebral lesions. They discovered that 20% of the control group performed in the borderline range while at least 8% had impaired performance. Furthermore, they found out that patients with left hemisphere lesions performed better compared with patients with right hemisphere lesions.


Evaluation of the association between spatial memory impairment and hemispheric locus of lesion

De Renzi et al. 1977 used the Corsi task in assessing the relationship between the spatial memory impairment and the hemispheric locus of lesion. They discovered that the lesion affected the spatial span by producing the visual field defect. The side of the lesion was immaterial with the findings. Patients with right hemisphere lesions and visual field defects performed poorly. They inferred that the right hemisphere’s posterior region played a dominant role in serving spatial memory mechanisms.


A variation of the Corsi task, the spatial span task is a tool used in clinical neuropsychology to determine deficits in nonverbal memory. Originally, it involved wooden blocks arranged irregularly and the examiner had to tap a sequence that the patient needed to copy. Using this tool, neuropsychologists discovered that patients with brain injury involving the parieto-occipital parts had impaired performance when they used the tool.

The n-back task is another type of assessment tool used to measure working memory capacity and working memory. Developed by Wayne Kirchner, it consists of a sequence of stimuli that the subject had to match with the n-steps in the sequence. “n” can be any number of tasks adjusted to relate to the level of difficulty of the task. Introduced in 1958, the n-back task is a memory game wherein “1-n” means that the subject needs to remember the location of one item while “2-n” means he has to remember the position of the second item.

Results & Data Analysis

After the successful completion of the test, the results of the Corsi block task can be interpreted with respect to the four scoring variables:

  • The longest sequence is remembered by the individual commonly called the Corsi span.
  • The average Corsi span for normal individuals is 5.
  • The correct number of sequences.
  • Immediate block forward span (S1-S4) / Immediate block backward span (S5-S7)- It is the measure of spatial memory span that is the longest sequence in which the subject reproduces a minimum of two of the three trials correctly.
  • Supra-block span (S3/S4) is a measure of short-term spatial learning. It shows the number of repetitions a subject may perform before achieving a specific target sequence.
  • The sample data compares the average scores of patients based on different demographic parameters. (Figure 1-4)

Figure 1 shows that younger adults perform better than their elderly counterparts in both forward and backward spans.

Figure 2 shows no significant difference in performance between females and males in both forward and backward spans.


Figure 3 shows a significant difference in the performance of young male adults and elderly male adults in the forward span. However, there is a slight difference in the performance of both male adults in the backward span.

Figure 4 shows a significant difference in both forward and backward spans for young and elderly female adults.

Strengths and Limitations


The Corsi task is widely used in assessing spatial attention and visuospatial working memory. Researchers used it in diagnosing various diseases like Korsakoff’s syndrome, Alzheimer’s disease, schizophrenia, and in supporting the hypothesis of focal brain damage localization.

With eCorsi, motor programming is involved using the touch interface. Furthermore, it further reduces different sources of inter-test and inter-trial variability among subjects and examiners. It is easy to check for errors since all trials are recorded automatically.

Moreover, eCorsi becomes handy in testing bedridden patients. It can be useful in testing subjects after an operation. For instance, it can be used in determining the residual spatial abilities after brain lesions in the focal area. Furthermore, eCorsi is less invasive because it allows remote administration of the task.

Researchers starting from the 1970s up to the present have used the original Corsi block-tapping task. Thus, the tool has been widely used in various studies. The introduction of the eCorsi occurred at the time the Internet became popular. eCorsi has standardized the parameters of the Corsi block-tapping task.


The only limitation is the absence of female advantage in the Corsi block test, however; its potential cause is yet to be probed (Laura et al. 2007).

Summary and Key Points

  • The eCorsi Block-Tapping Task is a digital or electronic version of the Corsi Block-Tapping Task.
  • Like the standard Corsi, psychologists and neuropsychologists use the eCorsi to investigate developmental changes, gender differences, nonverbal short-term memory, immediate nonverbal memory deficits, and visuospatial memory theoretical concepts.


  1. Capitani, E., Laiacona, M., Ciceri, E. (1991).
  2. Carlesimo, G.A., Fadda, L., Lorusso, S., Caltagirone, C. (1994). Verbal and spatial memory spans in Alzheimer’s and multi-infarct dementia. Acta Neurologica Scandinavica. 89(2):132-138.
  3. Chey, J., Lee, J., Kim, Y.S., Kwon, S.M., Shin, Y.M. (2002). Spatial working memory span, delayed response and executive function in schizophrenia. Psychiatry Research. 110(3):259-271.
  4. De Renzi, E., Faglioni, P., & Previdi, P. (1977). Spatial memory and hemispheric locus of
    lesion. Cortex, 13, 424–433. DOI: 10.1016/S0010-9452(77)80022-1
  5. De Renzi, E., & Nichelli, P. (1975). Verbal and non-verbal short-term memory impairment
    following hemispheric damage. Cortex, 11, 341–354.
  6. Haxby, J.V., Lundgren, S.L., Morley, G.K. (1983). Short-term retention of verbal, visual shape and visuospatial location information in normal and amnesic subjects. Neuropsychologica. 21(1):25-33. DOI: 10.1016/0028-3932(83)90097-0
  7. Isaacs, E. B., & Vargha-Khadem, F. (1989). Differential course of development of spatial and
    verbal memory span: A normative study. British Journal of Developmental Psychology,
    7, 377–380. DOI: 10.1111/j.2044-835X.1989.tb00814.x
  8. Jones, D., Farrand, P., Stuart, G., & Morris, N. (1995). Functional equivalence of verbal and
    spatial information in serial short-term memory. Journal of Experimental Psychology:
    Learning, Memory, and Cognition, 21, 1008–1018.
  9. Kessels, R.P., van Zandvoort, M.J., Postma, A., Kappelle, L.J., de Haan, E.H. (2000). The Corsi Block-Tapping Task: standardization and normative data. Applied Neuropsychology. 7(4):252-8. DOI:10.1207/S15324826AN0704_8
  10. Orsini A, Schiappa O, Grossi D. (1981). Sex and cultural differences in children’s spatial and verbal memory span. Perceptual and Motor Skills. 53, 39-42. DOI:10.2466/pms.1981.53.1.39
  11. Orsini, A., Chiacchio, L., Cinque, M., Cocchiaro, C., Schiappa, O., Grossi, C. (1986). Effects of Age, Education and Sex on Two Tests of Immediate Memory: A Study of Normal Subjects from 20 to 99 Years of Age. Perceptual and Motor Skills. 63, 727-732. DOI:10.2466/pms.1986.63.2.727
  12. Smyth, M. M., & Scholey, K. A. (1992). Determining spatial memory span: the role of movement time and articulation rate. Quarterly Journal of Experimental Psychology Series a Human Experimental Psychology, 45(3), 479-501. DOI: 10.1080/02724989208250624
  13. Laura Piccardia, Giuseppe Iariac, Maura Riccid, Filippo Bianchinib, Laura Zompantib, Cecilia Guarigliab. (2007). Walking in the Corsi test: Which type of memory do you need? Neuroscience letters, Volume 432, Issue 2, Pages 127–131. DOI: 10.1016/j.neulet.2007.12.044

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FHIR Claim Response

About FHIR Claim Response

The Claim Response resource is an important part of the FHIR Financial module. As explained above, the ClaimResponse is literally the response for the processing and the submission of claims (“FHIR,” 2017). The FHIR Financial set, in general, covers numerous financial services and resources, including ClaimResponse. Note that FHIR defines a Resource as any medical data that can be exchanged online. The FHIR Financial feature deals with eligibility, authorizations, and claims, which aims to help providers, insurers, and patients collaborate effectively. Also, let’s not forget that in a world where data has become a paramount factor in business decision making and marketing solutions, the FHIR Financial module can be used for data analytics.


FHIR Specimen: Usage

The ClaimResponse resource is an important part of the FHIR Financial module. As explained above, the ClaimResponse is literally the response for the processing and submission of claims (“FHIR,” 2017).

The FHIR Financial set, in general, covers numerous financial services and resources, including ClaimResponse. Note that FHIR defines a Resource as any medical data that can be exchanged online. The FHIR Financial feature deals with eligibility, authorizations, and claims, which aims to help providers, insurers, and patients collaborate effectively. Also, let’s not forget that in a world where data has become a paramount factor in business decision-making and marketing solutions, the FHIR Financial module can be used for data analytics.

FHIR ClaimResponse & Interoperability

As the ClaimResponse module provides information regarding the response to Claims, it’s one of the crucial FHIR resources that support interoperability and data exchange. Since FHIR (or Fast Healthcare Interoperability Resources) is an open-source standard that supports healthcare technology and app development, vital medical data is available at all times and at no cost. Data integration and management of medical information are essential in research and practice. Simply because data exchange and interoperability can help programmers, practitioners, stakeholders, and insurers work together with the sole purpose to improve medical practices.

The FHIR ClaimResponse resource module makes financial data exchange fast, structured, and transparent. From patients to payors, all parties involved in research and care will have access to financial data and the adjudication details from the processing and the statuses of a Claim.

FHIR ClaimResponse: The Adjudication Process Explained

Medical expenditures often become a burden to providers and patients. Therefore, medical plans and insurers are needed to cover medical bills. Usually, medical services and procedures generate medical bills. Consequently, when reimbursement or other types of payment, such as direct payment, are requested, medical bills are submitted to insurers by healthcare providers. This is how bills become claims. In other words, medical claims contain vital information about services, diagnostics, and costs (Tyree et al., 2006). The insurance companies are responsible for processing the claim. They decide to pay in full or reduce the amount paid to the healthcare provider. They can deny the claim too (“Claims Processing: What is Claims Adjudication?” 2017).

In practice, different claim statuses exist, and there are a few statuses regarding the finalized options for medical requests. Claims can be denied – when the claim has failed the adjudication process, paid – when the claim has been finalized, checks printed, and payment completed, or reversed – when errors have been found in a paid claim and changes are required (“Claim Status Definitions,” 2017). The ClaimResponse resource provides information about all those aspects: the response for the submission of a Claim, Re-adjudication, and Reversal. Note that claims submitted electronically can reduce errors and speed up the payment process.

FHIR ClaimResponse: Search Options

As FHIR is an open protocol, it provides coded and structured data along with narratives for human use. The FHIR ClaimResponse allows many search options, such as general parameters: about the patient, the date of submission, the service provided, the adjudication details, the insurance organization, the processing errors, the medical plan, the total cost, and much more. Let’s say that you need more details about a patient’s oral treatment. The ClaimResponse.addItem.modifier can show you the modifiers codes (in this case, for Oral care) and whether the treatment is cosmetic or linked to temporomandibular disorder (TMD), for example.

In addition, the FHIR protocol combines granular information with the healthcare process as a whole. For instance, the ExplanationOfBenefit resource can answer the need for a bigger medical picture and provide combined information about the Claim details, the ClaimResponse adjudication process, and the account balance information. To sum up, the FHIR ClaimResponse is a vital resource in FHIR and a needed reform in healthcare and insurance practices.


Adjudication – Medical services generate bills. When reimbursement is requested, bills are submitted to insurance providers and become claims. As a result, the insurance company is responsible for processing the claim and paying in full, denying the claim, or reducing the amount paid to the healthcare provider. This process is known as claims adjudication.

Claim – Medical claims can be defined as medical bills submitted to insurance providers by healthcare providers.

Pre-authorization – It’s the step when services are proposed, and funds are desired.

Pre-determination – Pre-determination refers to the process of determining what services can be covered and to what extent. It’s also known as the “what if claim.”

TMD – Temporomandibular disorders (TMD) is a term used to describe issues and pain related to jaw movement. Note that the temporomandibular (TM) joints (or jaw joints) connect the jawbone to the skull and are used for talking, chewing, yawning, etc. TMD can be caused by an injury, diseases, such as osteoarthritis, or other abnormalities.


  1. Claims Processing: What is Claims Adjudication? (January 19, 2017). Retrieved from
  2. Claim Status Definitions (July 1, 2017). Retrieved from
  3. FHIR (April 19, 2017). Retrieved from
  4. Tyree, P., Lind, B., & Lafferty, W. (2006). Challenges of Using Medical Insurance Claims Data for Utilization Analysis. American Journal of Medical Quality.

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FHIR Claim Response
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