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Related Experiment Videos

The number space and neglect.

Patrik Vuilleumier1, Stéphanie Ortigue, Peter Brugger

  • 1Laboratory of Behavioural Neurology and Imaging of Cognition, University Hospital Geneva. patrik.vuilleumier@medecine.unige.ch

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|May 26, 2004
PubMed
Summary
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Unilateral spatial neglect, a condition from right hemisphere damage, impairs number processing. Patients show deficits in recognizing number magnitude, particularly for numbers on the left side of a mental number line.

Area of Science:

  • Cognitive Neuroscience
  • Neuropsychology
  • Cognitive Psychology

Background:

  • Cognitive models propose number processing relies on a spatial representation, the mental number line.
  • Unilateral spatial neglect is a deficit in spatial attention following brain damage.

Purpose of the Study:

  • To investigate if unilateral spatial neglect affects the spatial representation of numbers.
  • To determine the impact of neglect on the mental number line.

Main Methods:

  • Four experiments were conducted with patients exhibiting unilateral neglect after right hemisphere damage.
  • Tasks included number magnitude judgments, non-numerical character size judgments, and time-of-day classifications.

Main Results:

Related Experiment Videos

  • Neglect patients showed slower responses to numbers on the left of a reference point on the mental number line.
  • This deficit was specific to number processing and not observed in non-numerical tasks.
  • A reversed pattern emerged for time-based number judgments, indicating task-dependent spatial representations.

    • Conclusions:

    • Unilateral spatial neglect can cause specific representational deficits in numerical cognition.
    • The spatial representation of numbers is influenced by attentional deficits and task demands.