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Related Experiment Video

Updated: May 23, 2026

Problem-Solving Before Instruction (PS-I): A Protocol for Assessment and Intervention in Students with Different Abilities

Problem-Solving Before Instruction (PS-I): A Protocol for Assessment and Intervention in Students with Different Abilities

Published on: September 11, 2021

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

Antonio Carota¹, Paola Marangolo, Hans J Markowitsch

¹Hildebrand Clinic, Rehabilitation Center, Brissago, Switzerland.

|April 13, 2012

Summary

A mathematics professor with left-hemispheric brain damage struggled with subtraction problems requiring borrowing. This calculation impairment may stem from difficulties with attention inhibition, linked to thalamo-cortical connection damage.

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Published on: August 28, 2021

Area of Science:

Neuroscience
Cognitive Psychology
Mathematics

Background:

Investigating the cognitive and neural underpinnings of mathematical deficits after focal brain injury.
Examining the specific impact of left-hemispheric capsular-thalamic hemorrhage on arithmetic abilities.

Observation:

A 69-year-old mathematics professor (GV) presented with significant difficulties in subtraction problems necessitating borrowing (e.g., 22-7).
Performance on subtraction problems without borrowing (e.g., 99-12) was largely preserved.
GV's strategy for difficult subtractions involved attempting to convert them into addition problems.

Findings:

The observed calculation impairment, specifically in subtractions with borrowing, is hypothesized to be linked to deficits in the inhibitory components of attention.
Difficulties were noted in tasks such as the Stroop test and go-no-go task, suggesting a broader attention-related deficit.
The impairment in borrowing-based subtractions may be associated with left-hemispheric damage affecting thalamo-cortical connections.

Implications:

This case highlights a potential link between executive functions, particularly attention inhibition, and specific arithmetic operations.
Understanding these neural-cognitive links can inform rehabilitation strategies for individuals with similar brain injuries.
The findings contribute to the broader understanding of how localized brain damage can lead to selective cognitive impairments.