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Related Experiment Video

Updated: Jun 1, 2026

Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection

Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection

Published on: March 10, 2021

Non-spatial neglect for the mental number line.

Jean-Philippe van Dijck¹, Wim Gevers, Christophe Lafosse

¹Faculty of Psychology and Educational Sciences, Department of Experimental Psychology, Ghent University, Belgium. jeanphilippe.vandijck@ugent.be

Neuropsychologia

|May 25, 2011

Summary

This study reveals that number line neglect in a brain-damaged patient stemmed from memory issues, not spatial deficits. This challenges the idea that number representation is purely spatial.

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Multimedia Battery for Assessment of Cognitive and Basic Skills in Mathematics (BM-PROMA)

Multimedia Battery for Assessment of Cognitive and Basic Skills in Mathematics (BM-PROMA)

Published on: August 28, 2021

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Last Updated: Jun 1, 2026

Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection

Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection

Published on: March 10, 2021

Multimedia Battery for Assessment of Cognitive and Basic Skills in Mathematics (BM-PROMA)

Multimedia Battery for Assessment of Cognitive and Basic Skills in Mathematics (BM-PROMA)

Published on: August 28, 2021

Area of Science:

Cognitive Neuroscience
Neuropsychology
Psychophysics

Background:

The mental number line is often conceptualized as a spatial representation, with numbers ordered left-to-right in Western cultures.
Rightward deviations in number bisection tasks following right brain damage are typically attributed to spatial-attentional deficits.
However, dissociations between physical and mental number space processing question this purely spatial interpretation.

Observation:

A left brain-damaged patient displayed right-sided neglect and left-sided neglect on the mental number line.
Neuropsychological assessment indicated the left-sided number line neglect was non-spatial.
This deficit was linked to mnemonic difficulties with initial items in visually presented verbal sequences.

Findings:

The patient's left-sided neglect on the mental number line was not due to spatial-attentional deficits.
Mnemonic impairments for verbal sequences, specifically at initial positions, underlie the observed number line deficit.
This suggests a crucial role for position-based verbal working memory in numerical tasks.

Implications:

Challenges the universality of purely spatial models for number representation.
Highlights the importance of memory systems, particularly verbal working memory, in numerical cognition.
Suggests that numerical tasks may rely more heavily on memory than previously assumed.