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Groupitizing modifies neural coding of numerosity.

Paula A Maldonado Moscoso1,2, Mark W Greenlee2, Giovanni Anobile1

  • 1Department of Neuroscience, Psychology, Pharmacology and Child Health, University of Florence, Florence, Italy.

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Summary
This summary is machine-generated.

Grouping objects speeds up numerical estimation by engaging specific brain areas. This study found that spatial grouping activates left hemisphere regions and the angular gyrus, aiding calculation.

Keywords:
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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Numerical estimation is enhanced by grouping objects, a process known as "groupitizing."
  • Grouping allows for subitizing small sets and summing estimates, improving accuracy and speed.

Purpose of the Study:

  • To investigate the neural basis of spatial grouping in numerical estimation.
  • To determine if grouping strategies recruit distinct brain regions beyond those involved in basic numerosity processing.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to scan 14 adults.
  • Participants estimated the numerosity or shape of randomly distributed or spatially grouped arrays.
  • Multivariate pattern analysis (MVPA) was employed to decode neural patterns.

Main Results:

  • Numerosity estimation of both random and grouped arrays activated a right frontoparietal network.
  • Spatially grouped stimuli additionally recruited left hemisphere regions and the bilateral angular gyrus.
  • Parietal neural patterns, not visual cortex patterns, decoded numerosities, and this correlated with behavioral acuity.

Conclusions:

  • Spatial grouping in numerical estimation engages the approximate number system and recruits additional brain regions associated with calculation.
  • The findings suggest a neural basis for how grouping enhances numerical cognition.