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Multimedia Battery for Assessment of Cognitive and Basic Skills in Mathematics (BM-PROMA)
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Semantic processing of neglected numbers.

Jérôme Sackur1, Lionel Naccache, Pascale Pradat-Diehl

  • 1INSERM U562, CEA/DSV, IFR 49, Orsay, France; Department of Philosophy, Université Nanterre-Paris X, Nanterre, France. jerome.sackur@gmail.com

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|May 13, 2008
PubMed
Summary
This summary is machine-generated.

Unconscious processing of number semantics is possible even in spatial neglect. Neglected primes, when congruent with target numbers, significantly impact performance, suggesting semantic access without conscious awareness.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Clinical Neurology

Background:

  • While neglected stimuli can be processed, unconscious semantic access remains poorly understood.
  • Spatial neglect often impairs awareness of stimuli in the neglected hemifield.

Purpose of the Study:

  • To investigate unconscious semantic processing of numbers in patients with spatial neglect.
  • To determine if stimuli in the neglected hemifield can access numerical semantics.

Main Methods:

  • Four patients with unilateral left spatial neglect performed a number comparison task.
  • Lateralized number primes were presented in either the intact or neglected hemifield before target numbers.
  • Subjective and objective measures assessed conscious perception of neglected primes.

Main Results:

  • Both consciously perceived (right hemifield) and neglected (left hemifield) primes influenced performance.
  • A congruency effect was observed: primes on the same side as the target facilitated faster categorization.
  • This effect suggests semantic processing of numerically relevant information in the neglected hemifield.

Conclusions:

  • Spatial neglect does not entirely preclude unconscious semantic processing of numerical information.
  • Congruency effects indicate that neglected stimuli can access abstract semantic representations, specifically numerical semantics.
  • Findings challenge the notion that conscious perception is a prerequisite for semantic access.