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Numerosity processing is context driven even in the subitizing range: An fMRI study.

Tali Leibovich1, Avishai Henik2, Moti Salti1

  • 1Department of Cognitive and Brain Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel; The Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer-Sheva, Israel.

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This summary is machine-generated.

Numerical judgments are not always automatic. Context and task demands influence how the brain processes number and continuous properties, revealing flexible cognitive mechanisms.

Keywords:
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Area of Science:

  • Cognitive Neuroscience
  • Psychology
  • Neuroimaging

Background:

  • Numerical judgments are crucial for daily life and often perceived as automatic.
  • Distinguishing numerosity from continuous properties (e.g., area) is challenging due to their correlation.
  • Understanding the underlying behavioral and neural mechanisms is essential.

Purpose of the Study:

  • To investigate the behavioral and neural mechanisms of numerical and continuous magnitude judgments.
  • To examine how task order influences the processing of numerosity and continuous properties.
  • To identify the brain regions involved in these cognitive processes.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) to measure hemodynamic responses.
  • A numerosity comparison task and a surface area comparison task.
  • Manipulation of congruency between numerical and continuous magnitudes based on task order.

Main Results:

  • Behavioral congruency effects varied with task order, showing interference between dimensions.
  • Continuous magnitudes consistently interfered with numerosity comparison.
  • Numerosity interfered with surface area comparison only when the numerosity task preceded it.
  • fMRI data revealed context-dependent hemispheric activation (right for numerosity-first, left for continuous-first).
  • Distinct neural pathways were identified: frontal eye field and post-central gyrus for continuous properties, and deactivation of these areas for numerosity, suggesting suppression.

Conclusions:

  • Numerical processing, even for small quantities, is not always automatic.
  • Cognitive context and task demands dynamically shape the neural pathways for magnitude judgments.
  • The brain actively suppresses irrelevant continuous information during numerosity tasks.
  • These findings highlight the flexible and context-dependent nature of numerical cognition.