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Acquired calculation disorders 

Acquired calculation disorders
Chapter:
Acquired calculation disorders
Author(s):

Marinella Cappelletti

DOI:
10.1093/med/9780199655946.003.0017
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date: 07 June 2020

Acalculia is an acquired disorder of number processing and calculation skills following cerebral damage. It can be very incapacitating as it interferes with everyday activities such as shopping, using bank accounts and telephones. Acalculia is not a unitary disorder and it can take a variety of different forms. The incidence of acalculia in patients with left hemisphere lesions has been estimated to be about 20 per cent, 90 per cent in cases of early-stage Alzheimer’s. Knowing its incidence impact on everyday life has helped to improve assessment techniques and has recently promoted the development of rehabilitation programmes. This chapter presents the basic components of the number and calculation system, outlines lesion localization in number and calculation disorders, discusses cases of selective impairment or preservation of number processing and calculation, and proposes propose some guidelines for the assessment of acalculia in neurological patients.

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