When solving 22-7 is much more difficult than 99-12

Carota A, Marangolo P, Markowitsch HJ, Calabrese P (2013)
Neurocase 19(1): 54-66.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
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Carota, Antonio; Marangolo, Paola; Markowitsch, Hans J.UniBi; Calabrese, Pasquale
Abstract / Bemerkung
We describe the case of a 69-year-old professor of mathematics (GV) who was examined 2 years after left-hemispheric capsular-thalamic haemorrhage. GV showed disproportionate impairment in subtractions requiring borrowing (22??7). For large subtraction problems without borrowing (99??12) performance was almost flawless. Subtractions with borrowing mostly relied on inadequate attempts to invert subtractions into the corresponding additions (22??7?=?x as 7?+?x?=?22). The hypothesis is advanced that difficulty in the inhibitory components of attention tasks (Stroop test, go-no-go task) might be the responsible factor of his calculation impairment. A deficit in subtractions with borrowing might be related to left-hemispheric damage involving thalamo-cortical connections.
Calculation; Borrowing; Capsular-thalamic stroke; Subtraction; Dyscalculia
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Carota A, Marangolo P, Markowitsch HJ, Calabrese P. When solving 22-7 is much more difficult than 99-12. Neurocase. 2013;19(1):54-66.
Carota, A., Marangolo, P., Markowitsch, H. J., & Calabrese, P. (2013). When solving 22-7 is much more difficult than 99-12. Neurocase, 19(1), 54-66. doi:10.1080/13554794.2011.654216
Carota, A., Marangolo, P., Markowitsch, H. J., and Calabrese, P. (2013). When solving 22-7 is much more difficult than 99-12. Neurocase 19, 54-66.
Carota, A., et al., 2013. When solving 22-7 is much more difficult than 99-12. Neurocase, 19(1), p 54-66.
A. Carota, et al., “When solving 22-7 is much more difficult than 99-12”, Neurocase, vol. 19, 2013, pp. 54-66.
Carota, A., Marangolo, P., Markowitsch, H.J., Calabrese, P.: When solving 22-7 is much more difficult than 99-12. Neurocase. 19, 54-66 (2013).
Carota, Antonio, Marangolo, Paola, Markowitsch, Hans J., and Calabrese, Pasquale. “When solving 22-7 is much more difficult than 99-12”. Neurocase 19.1 (2013): 54-66.

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